Danfoss VLT Refrigeration Drive FC 103

Name: Danfoss VLT Refrigeration Drive FC 103
Brand: Danfoss
SKU: d06b67fa-8df3-4441-a49b-36029bffc126

Frequency converter for refrigeration compressors and condenser fans with pack control.

The Danfoss VLT Refrigeration Drive FC 103 is a frequency converter that controls compressors, condenser fans and pumps in commercial and industrial refrigeration. This Modbus RTU template reads frequency, current, power, temperatures, suction pressure and alarms, and lets you start, stop and adjust speed and setpoints from ModbusCloud.

Protocol: Modbus RTU
Connection: RS485, 19200 baud
Registers: 878, read and write

Brand: Danfoss
Key readings: Output frequency · Motor current · Power · Motor voltage · DC link voltage · Heatsink temperature · Suction pressure P0 · Alarm and warning words
Available commands: Start and stop · Speed reference · P0 setpoint · Setpoints 1 to 3 · Ramp times · Pack controller settings
Compatible models: VLT Refrigeration Drive FC 103 · VLT Refrigeration Drive FC 103 1.1 to 90 kW · VLT Refrigeration Drive FC 103 110 to 800 kW
Last updated: 13 October 2026

Registers (878)

844 read, 686 write

Name	Unit	Access
Frequency	Hz	Read
Motor Current	A	Read
Power [kW]	kW	Read
Motor Voltage	V	Read
Speed [RPM]	rpm	Read
Torque [Nm]	Nm	Read
Torque [%]	%	Read
DC Link Voltage	V	Read
Heatsink Temp.	°C	Read
Control Card Temp.	°C	Read
Motor Thermal	%	Read
Inverter Thermal	%	Read
Reference		Read
Reference [%]	%	Read
Main Actual Value [%]	%	Read
Feedback		Read
Feedback 1		Read
Feedback 2		Read
Feedback 3		Read
Discharge Temperature		Read
P0	K	Read
P0 Setpoint	K	Read and write
P0 Reference	K	Read
Monitor 1 Pressure 1		Read
Monitor 2 Pressure 2		Read
Pack Capacity [%]	%	Read
Pack Status		Read
Compressor Status		Read
Lead Compressor		Read
Relay Status		Read
Compressor ON Time	h	Read
Relay ON Time	h	Read
Alarm Word		Read
Alarm Word 2		Read
Warning Word		Read
Warning Word 2		Read
Ext. Status Word		Read
Ext. Status Word 2		Read
Maintenance Word		Read
Ext. Status Word 3		Read
Control Word		Read
Status Word		Read
Operating Hours	h	Read
Running Hours	h	Read
kWh Counter	kWh	Read
Power Up's		Read
Over Temp's		Read
Over Volt's		Read
Number of Starts		Read
Fan Running Hours	h	Read
Status Coil Control Ready		Read
Status Coil Drive Ready		Read
Status Coil Coasting Stop or Safety Closed		Read
Status Coil Alarm		Read
Status Coil Bit 04		Read
Status Coil Bit 05		Read
Status Coil Bit 06		Read
Status Coil Warning		Read
Status Coil At Reference		Read
Status Coil Auto Mode		Read
Status Coil In Frequency Range		Read
Status Coil Running		Read
Status Coil Bit 12		Read
Status Coil Voltage Warning		Read
Status Coil Current Limit		Read
Status Coil Thermal Warning		Read
Actual Value Coil Bit 0		Read
Actual Value Coil Bit 1		Read
Actual Value Coil Bit 2		Read
Actual Value Coil Bit 3		Read
Actual Value Coil Bit 4		Read
Actual Value Coil Bit 5		Read
Actual Value Coil Bit 6		Read
Actual Value Coil Bit 7		Read
Actual Value Coil Bit 8		Read
Actual Value Coil Bit 9		Read
Actual Value Coil Bit 10		Read
Actual Value Coil Bit 11		Read
Actual Value Coil Bit 12		Read
Actual Value Coil Bit 13		Read
Actual Value Coil Bit 14		Read
Actual Value Coil Bit 15		Read
Bus Status Word		Read
Main Actual Value		Read
Last Error Code		Read
Control Coil Preset Reference LSB		Write
Control Coil Preset Reference MSB		Write
Control Coil DC Brake		Write
Control Coil Coast Stop		Write
Control Coil Quick Stop		Write
Control Coil Freeze Frequency		Write
Control Coil Ramp Stop or Start		Write
Control Coil Reset		Write
Control Coil Jog		Write
Control Coil Ramp 1 or 2		Write
Control Coil Data Valid		Write
Control Coil Relay 1		Write
Control Coil Relay 2		Write
Control Coil Set-up LSB		Write
Control Coil Set-up MSB		Write
Control Coil Reversing		Write
Reference Coil Bit 0		Write
Reference Coil Bit 1		Write
Reference Coil Bit 2		Write
Reference Coil Bit 3		Write
Reference Coil Bit 4		Write
Reference Coil Bit 5		Write
Reference Coil Bit 6		Write
Reference Coil Bit 7		Write
Reference Coil Bit 8		Write
Reference Coil Bit 9		Write
Reference Coil Bit 10		Write
Reference Coil Bit 11		Write
Reference Coil Bit 12		Write
Reference Coil Bit 13		Write
Reference Coil Bit 14		Write
Reference Coil Bit 15		Write
Parameter Write Control		Read and write
Bus Control Word		Write
Bus Reference		Write
Array Index Pointer		Read and write
Language		Read and write
Motor Speed Unit		Read and write
Regional Settings		Read and write
Operating State at Power-up		Read and write
Local Mode Unit		Read and write
Active Set-up		Read and write
Programming Set-up		Read and write
This Set-up Linked to		Read and write
Readout: Linked Set-ups		Read and write
Readout: Prog. Set-ups / Channel		Read and write
Display Line 1.1 Small		Read and write
Display Line 1.2 Small		Read and write
Display Line 1.3 Small		Read and write
Display Line 2 Large		Read and write
Display Line 3 Large		Read and write
My Personal Menu		Read and write
Custom Readout Unit		Read and write
Custom Readout Min Value		Read and write
Custom Readout Max Value		Read and write
Display Text 1		Read and write
Display Text 2		Read and write
Display Text 3		Read and write
[Hand On] Key on LCP		Read and write
[Off] Key on LCP		Read and write
[Auto On] Key on LCP		Read and write
[Reset] Key on LCP		Read and write
LCP Copy		Read and write
Set-up Copy		Read and write
Main Menu Password		Read and write
Access to Main Menu w/o Password		Read and write
Personal Menu Password		Read and write
Access to Personal Menu w/o Password		Read and write
Bus Password Access		Read and write
Set Date and Time		Read and write
Date Format		Read and write
Time Format		Read and write
DST/Summertime		Read and write
DST/Summertime Start		Read and write
DST/Summertime End		Read and write
Clock Fault		Read and write
Working Days		Read and write
Additional Working Days		Read and write
Additional Non-Working Days		Read and write
Date and Time Readout		Read
Configuration Mode		Read and write
Torque Characteristics		Read and write
Clockwise Direction		Read and write
Motor Construction		Read and write
Damping Gain	%	Read and write
Low Speed Filter Time Const.		Read and write
High Speed Filter Time Const.		Read and write
Voltage Filter Time Const.		Read and write
Motor Power [kW]	kW	Read and write
Motor Power [HP]		Read and write
Motor Voltage (1-22)		Read and write
Motor Frequency		Read and write
Motor Current (1-24)		Read and write
Motor Nominal Speed		Read and write
Motor Cont. Rated Torque		Read and write
Motor Rotation Check		Read and write
Automatic Motor Adaptation (AMA)		Read and write
Stator Resistance (Rs)		Read and write
Rotor Resistance (Rr)		Read and write
Main Reactance (Xh)		Read and write
Iron Loss Resistance (Rfe)		Read and write
D-axis Inductance (Ld)		Read and write
Q-axis Inductance (Lq)		Read and write
Motor Poles		Read and write
Back EMF at 1000 RPM		Read and write
Motor Angle Offset		Read and write
D-axis Inductance Sat. (LdSat)		Read and write
Q-axis Inductance Sat. (LqSat)		Read and write
Position Detection Gain	%	Read and write
Torque Calibration		Read and write
Inductance Sat. Point		Read and write
Motor Magnetisation at Zero Speed	%	Read and write
Min Speed Normal Magnetising [RPM]	rpm	Read and write
Min Speed Normal Magnetising [Hz]	Hz	Read and write
Flying Start Test Pulses Current		Read and write
Flying Start Test Pulses Frequency		Read and write
Low Speed Load Compensation	%	Read and write
High Speed Load Compensation	%	Read and write
Slip Compensation	%	Read and write
Slip Compensation Time Constant		Read and write
Resonance Dampening	%	Read and write
Resonance Dampening Time Constant	ms	Read and write
Min. Current at Low Speed		Read and write
PM Start Mode		Read and write
Start Delay	s	Read and write
Start Function		Read and write
Flying Start		Read and write
Start Speed [RPM]	rpm	Read and write
Start Speed [Hz]	Hz	Read and write
Start Current	A	Read and write
Compressor Start Max Speed [RPM]	rpm	Read and write
Compressor Start Max Speed [Hz]	Hz	Read and write
Compressor Start Max Time to Trip	s	Read and write
Function at Stop		Read and write
Min Speed for Function at Stop [RPM]	rpm	Read and write
Min Speed for Function at Stop [Hz]	Hz	Read and write
Compressor Min. Speed for Trip [RPM]	rpm	Read and write
Compressor Min. Speed for Trip [Hz]	Hz	Read and write
Motor Thermal Protection		Read and write
Motor External Fan		Read and write
Thermistor Source		Read and write
DC Hold/Preheat Current	%	Read and write
DC Brake Current	%	Read and write
DC Braking Time	s	Read and write
DC Brake Cut In Speed [RPM]	rpm	Read and write
DC Brake Cut In Speed [Hz]	Hz	Read and write
Parking Current	%	Read and write
Parking Time	s	Read and write
Brake Function		Read and write
AC Brake Max. Current	%	Read and write
Over-voltage Control		Read and write
Minimum Reference		Read and write
Maximum Reference		Read and write
Reference Function		Read and write
Preset Reference	%	Read and write
Jog Speed [Hz]	Hz	Read and write
Reference Site		Read and write
Preset Relative Reference	%	Read and write
Reference 1 Source		Read and write
Reference 2 Source		Read and write
Reference 3 Source		Read and write
Jog Speed [RPM]	rpm	Read and write
Ramp 1 Ramp Up Time		Read and write
Ramp 1 Ramp Down Time		Read and write
Ramp 2 Ramp Up Time		Read and write
Ramp 2 Ramp Down Time		Read and write
Jog Ramp Time		Read and write
Quick Stop Ramp Time		Read and write
Starting Ramp Up Time		Read and write
Step Size	%	Read and write
Ramp Time	s	Read and write
Power Restore		Read and write
Maximum Limit	%	Read and write
Minimum Limit	%	Read and write
Ramp Delay		Read and write
Motor Speed Direction		Read and write
Motor Speed Low Limit [RPM]	rpm	Read and write
Motor Speed Low Limit [Hz]	Hz	Read and write
Motor Speed High Limit [RPM]	rpm	Read and write
Motor Speed High Limit [Hz]	Hz	Read and write
Torque Limit Motor Mode	%	Read and write
Torque Limit Generator Mode	%	Read and write
Current Limit		Read and write
Max Output Frequency		Read and write
Warning Current Low	A	Read and write
Warning Current High		Read and write
Warning Speed Low	rpm	Read and write
Warning Speed High		Read and write
Warning Reference Low		Read and write
Warning Reference High		Read and write
Warning Feedback Low		Read and write
Warning Feedback High		Read and write
Missing Motor Phase Function		Read and write
Motor Check At Start		Read and write
Bypass Speed From [RPM]	rpm	Read and write
Bypass Speed From [Hz]	Hz	Read and write
Bypass Speed To [RPM]	rpm	Read and write
Bypass Speed To [Hz]	Hz	Read and write
Semi-Auto Bypass Set-up		Read and write
Digital I/O Mode		Read and write
Terminal 27 Mode		Read and write
Terminal 29 Mode		Read and write
Terminal 18 Digital Input		Read and write
Terminal 19 Digital Input		Read and write
Terminal 27 Digital Input		Read and write
Terminal 29 Digital Input		Read and write
Terminal 32 Digital Input		Read and write
Terminal 33 Digital Input		Read and write
Terminal X30/2 Digital Input		Read and write
Terminal X30/3 Digital Input		Read and write
Terminal X30/4 Digital Input		Read and write
Terminal 37 Safe Stop		Read and write
Terminal X46/1 Digital Input		Read and write
Terminal X46/3 Digital Input		Read and write
Terminal X46/5 Digital Input		Read and write
Terminal X46/7 Digital Input		Read and write
Terminal X46/9 Digital Input		Read and write
Terminal X46/11 Digital Input		Read and write
Terminal X46/13 Digital Input		Read and write
Terminal 27 Digital Output		Read and write
Terminal 29 Digital Output		Read and write
Term X30/6 Digi Out (MCB 101)		Read and write
Term X30/7 Digi Out (MCB 101)		Read and write
Function Relay		Read and write
On Delay, Relay	s	Read and write
Off Delay, Relay	s	Read and write
Term. 29 Low Frequency	Hz	Read and write
Term. 29 High Frequency	Hz	Read and write
Term. 29 Low Ref./Feedb. Value		Read and write
Term. 29 High Ref./Feedb. Value		Read and write
Pulse Filter Time Constant #29	ms	Read and write
Term. 33 Low Frequency	Hz	Read and write
Term. 33 High Frequency	Hz	Read and write
Term. 33 Low Ref./Feedb. Value		Read and write
Term. 33 High Ref./Feedb. Value		Read and write
Pulse Filter Time Constant #33	ms	Read and write
Terminal 27 Pulse Output Variable		Read and write
Pulse Output Max Freq #27	Hz	Read and write
Terminal 29 Pulse Output Variable		Read and write
Pulse Output Max Freq #29	Hz	Read and write
Terminal X30/6 Pulse Output Variable		Read and write
Pulse Output Max Freq #X30/6	Hz	Read and write
AHF Cap Reconnect Delay	s	Read and write
Digital & Relay Bus Control		Read and write
Pulse Out #27 Bus Control	%	Read and write
Pulse Out #27 Timeout Preset	%	Read and write
Pulse Out #29 Bus Control	%	Read and write
Pulse Out #29 Timeout Preset	%	Read and write
Pulse Out #X30/6 Bus Control	%	Read and write
Pulse Out #X30/6 Timeout Preset	%	Read and write
Live Zero Timeout Time	s	Read and write
Live Zero Timeout Function		Read and write
Terminal 53 Low Voltage	V	Read and write
Terminal 53 High Voltage	V	Read and write
Terminal 53 Low Current	mA	Read and write
Terminal 53 High Current	mA	Read and write
Terminal 53 Low Ref./Feedb. Value		Read and write
Terminal 53 High Ref./Feedb. Value		Read and write
Terminal 53 Filter Time Constant	s	Read and write
Terminal 53 Live Zero		Read and write
Terminal 54 Low Voltage	V	Read and write
Terminal 54 High Voltage	V	Read and write
Terminal 54 Low Current	mA	Read and write
Terminal 54 High Current	mA	Read and write
Terminal 54 Low Ref./Feedb. Value		Read and write
Terminal 54 High Ref./Feedb. Value		Read and write
Terminal 54 Filter Time Constant	s	Read and write
Terminal 54 Live Zero		Read and write
Terminal X30/11 Low Voltage	V	Read and write
Terminal X30/11 High Voltage	V	Read and write
Term. X30/11 Low Ref./Feedb. Value		Read and write
Term. X30/11 High Ref./Feedb. Value		Read and write
Term. X30/11 Filter Time Constant	s	Read and write
Term. X30/11 Live Zero		Read and write
Terminal X30/12 Low Voltage	V	Read and write
Terminal X30/12 High Voltage	V	Read and write
Term. X30/12 Low Ref./Feedb. Value		Read and write
Term. X30/12 High Ref./Feedb. Value		Read and write
Term. X30/12 Filter Time Constant	s	Read and write
Term. X30/12 Live Zero		Read and write
Terminal 42 Output		Read and write
Terminal 42 Output Min Scale	%	Read and write
Terminal 42 Output Max Scale	%	Read and write
Terminal 42 Output Bus Control	%	Read and write
Terminal 42 Output Timeout Preset	%	Read and write
Terminal X30/8 Output		Read and write
Terminal X30/8 Min. Scale	%	Read and write
Terminal X30/8 Max. Scale	%	Read and write
Terminal X30/8 Output Bus Control	%	Read and write
Terminal X30/8 Output Timeout Preset	%	Read and write
Terminal X45/1 Output		Read and write
Terminal X45/1 Min. Scale	%	Read and write
Terminal X45/1 Max. Scale	%	Read and write
Terminal X45/1 Bus Control	%	Read and write
Terminal X45/1 Output Timeout Preset	%	Read and write
Terminal X45/3 Output		Read and write
Terminal X45/3 Min. Scale	%	Read and write
Terminal X45/3 Max. Scale	%	Read and write
Terminal X45/3 Bus Control	%	Read and write
Terminal X45/3 Output Timeout Preset	%	Read and write
Control Site		Read and write
Control Source		Read and write
Control Timeout Time		Read and write
Control Timeout Function		Read and write
End-of-Timeout Function		Read and write
Reset Control Timeout		Read and write
Diagnosis Trigger		Read and write
Control Profile		Read and write
Configurable Status Word STW		Read and write
Store Data Values		Read and write
Protocol		Read and write
Address		Read and write
Baud Rate		Read and write
Parity / Stop Bits		Read and write
Minimum Response Delay	ms	Read and write
Maximum Response Delay		Read and write
Maximum Inter-Char Delay		Read and write
Telegram Selection		Read and write
PCD Write Configuration		Read and write
PCD Read Configuration		Read and write
BTM Transaction Command		Read and write
BTM Transaction Status		Read and write
BTM Timeout	s	Read and write
Coasting Select		Read and write
DC Brake Select		Read and write
Start Select		Read and write
Reversing Select		Read and write
Set-up Select		Read and write
Preset Reference Select		Read and write
Bus Message Count		Read and write
Bus Error Count		Read and write
Slave Message Count		Read and write
Slave Error Count		Read and write
Bus Jog 1 Speed	rpm	Read and write
Bus Jog 2 Speed		Read and write
Bus Feedback 1		Read and write
Bus Feedback 2		Read and write
Bus Feedback 3		Read and write
Store Data Values (11-21)		Read and write
VLT Network Address		Read and write
AK Service Pin		Read and write
Alarm Text		Read
Alarm Status		Read
SL Controller Mode		Read and write
Start Event		Read and write
Stop Event		Read and write
Reset SLC		Read and write
Comparator Operand		Read and write
Comparator Operator		Read and write
Comparator Value		Read and write
SL Controller Timer		Read and write
Logic Rule Boolean 1		Read and write
Logic Rule Operator 1		Read and write
Logic Rule Boolean 2		Read and write
Logic Rule Operator 2		Read and write
Logic Rule Boolean 3		Read and write
SL Controller Event		Read and write
SL Controller Action		Read and write
Alert Trigger		Read and write
Alert Action		Read and write
Alert Text		Read and write
Alert Alarm Word		Read
Alert Warning Word		Read
Alert Status Word		Read
Switching Pattern		Read and write
Switching Frequency		Read and write
Overmodulation		Read and write
PWM Random		Read and write
Mains Failure		Read and write
Mains Voltage at Mains Fault		Read and write
Function at Mains Imbalance		Read and write
Kin. Backup Gain	%	Read and write
Reset Mode		Read and write
Automatic Restart Time	s	Read and write
Operation Mode		Read and write
Trip Delay at Torque Limit	s	Read and write
Trip Delay at Inverter Fault		Read and write
Production Settings		Read and write
Service Code		Read and write
Current Lim Ctrl, Proportional Gain	%	Read and write
Current Lim Ctrl, Integration Time		Read and write
VT Level	%	Read and write
AEO Minimum Magnetisation		Read and write
Minimum AEO Frequency		Read and write
Motor Cosphi		Read and write
RFI Filter		Read and write
DC Link Compensation		Read and write
Fan Control		Read and write
Fan Monitor		Read and write
Output Filter		Read and write
Actual Number of Inverter Units		Read
Function at Over Temperature		Read and write
Function at Inverter Overload		Read and write
Inv. Overload Derate Current	%	Read and write
Option Supplied By External 24VDC		Read and write
Option Detection		Read and write
Fault Level		Read and write
Reset kWh Counter		Read and write
Reset Running Hours Counter		Read and write
Logging Source		Read and write
Logging Interval		Read and write
Trigger Event		Read and write
Logging Mode		Read and write
Samples Before Trigger		Read and write
Historic Log: Event		Read
Historic Log: Value		Read
Historic Log: Time	ms	Read
Historic Log: Date and Time		Read
Alarm Log: Error Code		Read
Alarm Log: Value		Read
Alarm Log: Time	s	Read
Alarm Log: Date and Time		Read
Alarm Log: Status		Read
Alarm Log: Alarm Text		Read
Preset Fan Running Hours	h	Read and write
Custom Readout		Read
Power [hp]		Read
Frequency [%]	%	Read
Calibrated Stator Resistance	Ω	Read
System Temp.	°C	Read
Brake Energy /s	kW	Read
Brake Energy /2 Min	kW	Read
Inv. Nom. Current		Read
Inv. Max. Current		Read
SL Controller State		Read
Logging Buffer Full		Read
LCP Bottom Statusline		Read
Current Fault Source		Read
External Reference		Read
Digi Pot Reference		Read
Digital Input		Read
Terminal 53 Switch Setting		Read
Analog Input 53		Read
Terminal 54 Switch Setting		Read
Analog Input 54		Read
Analog Output 42 [mA]	mA	Read
Digital Output [bin]		Read
Pulse Input #29 [Hz]	Hz	Read
Pulse Input #33 [Hz]	Hz	Read
Pulse Output #27 [Hz]	Hz	Read
Pulse Output #29 [Hz]	Hz	Read
Relay Output [bin]		Read
Counter A		Read
Counter B		Read
Analog In X30/11		Read
Analog In X30/12		Read
Analog Out X30/8 [mA]	mA	Read
Analog Out X45/1 [mA]	mA	Read
Analog Out X45/3 [mA]	mA	Read
Fieldbus CTW 1		Read
Fieldbus REF 1		Read
Comm. Option STW		Read
FC Port CTW 1		Read
FC Port REF 1		Read
Maintenance Log: Item		Read
Maintenance Log: Action		Read
Maintenance Log: Time	s	Read
Maintenance Log: Date and Time		Read
Analog Input X42/1		Read
Analog Input X42/3		Read
Analog Input X42/5		Read
Analog Out X42/7 [V]	V	Read
Analog Out X42/9 [V]	V	Read
Analog Out X42/11 [V]	V	Read
Air Pressure to Flow Air Flow		Read
Digital Input 2		Read
Mains Voltage	V	Read
Mains Frequency	Hz	Read
Mains Imbalance	%	Read
Rectifier DC Volt.	V	Read
Feedback 1 Source		Read and write
Feedback 1 Conversion		Read and write
Feedback 1 Source Unit		Read and write
Feedback 2 Source		Read and write
Feedback 2 Conversion		Read and write
Feedback 2 Source Unit		Read and write
Feedback 3 Source		Read and write
Feedback 3 Conversion		Read and write
Feedback 3 Source Unit		Read and write
Reference/Feedback Unit		Read and write
Feedback Function		Read and write
Setpoint 1		Read and write
Setpoint 2		Read and write
Setpoint 3		Read and write
Setpoint Type		Read and write
Refrigerant		Read and write
User Defined Refrigerant A1		Read and write
User Defined Refrigerant A2		Read and write
User Defined Refrigerant A3		Read and write
Thermostat/Pressostat Function		Read and write
Cut-out Value		Read and write
Cut-in Value		Read and write
Closed Loop Type		Read and write
PID Performance		Read and write
PID Output Change		Read and write
Minimum Feedback Level		Read and write
Maximum Feedback Level		Read and write
PID Autotuning		Read and write
PID Normal/ Inverse Control		Read and write
PID Start Speed [RPM]	rpm	Read and write
PID Start Speed [Hz]	Hz	Read and write
On Reference Bandwidth	%	Read and write
PID Anti Windup		Read and write
PID Proportional Gain		Read and write
PID Integral Time	s	Read and write
PID Differentiation Time	s	Read and write
PID Diff. Gain Limit		Read and write
Ext. Loop Closed Loop Type		Read and write
Ext. Loop PID Performance		Read and write
Ext. Loop PID Output Change		Read and write
Ext. Loop Minimum Feedback Level		Read and write
Ext. Loop Maximum Feedback Level		Read and write
Ext. Loop PID Autotuning		Read and write
Ext. 1 Ref./Feedback Unit		Read and write
Ext. 1 Minimum Reference		Read and write
Ext. 1 Maximum Reference		Read and write
Ext. 1 Reference Source		Read and write
Ext. 1 Feedback Source		Read and write
Ext. 1 Setpoint		Read and write
Ext. 1 PID Conversion		Read and write
Ext. 1 Reference		Read and write
Ext. 1 Feedback		Read and write
Ext. 1 Output [%]	%	Read and write
Ext. 1 Normal/Inverse Control		Read and write
Ext. 1 Proportional Gain		Read and write
Ext. 1 Integral Time	s	Read and write
Ext. 1 Differentation Time	s	Read and write
Ext. 1 Dif. Gain Limit		Read and write
Ext. 2 Ref./Feedback Unit		Read and write
Ext. 2 Minimum Reference		Read and write
Ext. 2 Maximum Reference		Read and write
Ext. 2 Reference Source		Read and write
Ext. 2 Feedback Source		Read and write
Ext. 2 Setpoint		Read and write
Ext. 2 PID Conversion		Read and write
Ext. 2 Reference		Read and write
Ext. 2 Feedback		Read and write
Ext. 2 Output [%]	%	Read and write
Ext. 2 Normal/Inverse Control		Read and write
Ext. 2 Proportional Gain		Read and write
Ext. 2 Integral Time	s	Read and write
Ext. 2 Differentation Time	s	Read and write
Ext. 2 Dif. Gain Limit		Read and write
Ext. 3 Ref./Feedback Unit		Read and write
Ext. 3 Minimum Reference		Read and write
Ext. 3 Maximum Reference		Read and write
Ext. 3 Reference Source		Read and write
Ext. 3 Feedback Source		Read and write
Ext. 3 Setpoint		Read and write
Ext. 3 PID Conversion		Read and write
Ext. 3 Reference		Read and write
Ext. 3 Feedback		Read and write
Ext. 3 Output [%]	%	Read and write
Ext. 3 Normal/Inverse Control		Read and write
Ext. 3 Proportional Gain		Read and write
Ext. 3 Integral Time	s	Read and write
Ext. 3 Differentation Time	s	Read and write
Ext. 3 Dif. Gain Limit		Read and write
Ext. Loop Refrigerant		Read and write
Ext. Loop User Defined Refrigerant A1		Read and write
Ext. Loop User Defined Refrigerant A2		Read and write
Ext. Loop User Defined Refrigerant A3		Read and write
External Interlock Delay	s	Read and write
Air Pressure to Flow Signal Source		Read and write
Air Pressure to Flow Fan K-factor		Read and write
Air Pressure to Flow Air Density		Read and write
Air Pressure to Flow Fan Flow Unit		Read and write
Low Power Auto Set-up		Read and write
Low Power Detection		Read and write
Low Speed Detection		Read and write
No-Flow Function		Read and write
No-Flow Delay	s	Read and write
Dry Pump Function		Read and write
Dry Pump Delay	s	Read and write
No-Flow Power	kW	Read and write
Power Correction Factor	%	Read and write
Low Speed [RPM]	rpm	Read and write
Low Speed [Hz]	Hz	Read and write
Low Speed Power [kW]	kW	Read and write
Low Speed Power [HP]		Read and write
High Speed [RPM]	rpm	Read and write
High Speed [Hz]	Hz	Read and write
High Speed Power [kW]	kW	Read and write
High Speed Power [HP]		Read and write
Minimum Run Time	s	Read and write
Minimum Sleep Time	s	Read and write
Wake-up Speed [RPM]	rpm	Read and write
Wake-up Speed [Hz]	Hz	Read and write
Wake-up Ref./FB Difference	%	Read and write
Setpoint Boost	%	Read and write
Maximum Boost Time	s	Read and write
End of Curve Function		Read and write
End of Curve Delay	s	Read and write
Broken Belt Function		Read and write
Broken Belt Torque	%	Read and write
Broken Belt Delay	s	Read and write
Short Cycle Protection		Read and write
Interval between Starts	s	Read and write
Minimum Run Time (22-77)	s	Read and write
Minimum Run Time Override		Read and write
Minimum Run Time Override Value		Read and write
Flow Compensation		Read and write
Square-linear Curve Approximation	%	Read and write
Work Point Calculation		Read and write
Speed at No-Flow [RPM]	rpm	Read and write
Speed at No-Flow [Hz]	Hz	Read and write
Speed at Design Point [RPM]	rpm	Read and write
Speed at Design Point [Hz]	Hz	Read and write
Pressure at No-Flow Speed		Read and write
Pressure at Rated Speed		Read and write
Flow at Design Point		Read and write
Flow at Rated Speed		Read and write
ON Time		Read and write
ON Action		Read and write
OFF Time		Read and write
OFF Action		Read and write
Occurrence		Read and write
Maintenance Item		Read and write
Maintenance Action		Read and write
Maintenance Time Base		Read and write
Maintenance Time Interval	h	Read and write
Maintenance Date and Time		Read and write
Reset Maintenance Word		Read and write
Maintenance Text		Read and write
Energy Log Resolution		Read and write
Period Start		Read and write
Energy Log		Read
Reset Energy Log		Read and write
Trend Variable		Read and write
Continuous Bin Data		Read
Timed Bin Data		Read
Timed Period Start		Read and write
Timed Period Stop		Read and write
Minimum Bin Value		Read and write
Reset Continuous Bin Data		Read and write
Reset Timed Bin Data		Read and write
Power Reference Factor	%	Read and write
Energy Cost		Read and write
Investment		Read and write
Energy Savings	kWh	Read
Cost Savings		Read
Pack Controller		Read and write
Motor Start		Read and write
Pump Cycling		Read and write
Fixed Lead Compressor		Read and write
Number of Compressors		Read and write
Neutral Zone		Read and write
+ Zone		Read and write
- Zone		Read and write
Fixed Speed Neutral Zone		Read and write
+ Zone Delay	s	Read and write
- Zone Delay	s	Read and write
++ Zone Delay	s	Read and write
-- Zone Delay	s	Read and write
Override Bandwidth Ramp Time		Read and write
Destage At No-Flow		Read and write
Stage Function		Read and write
Stage Function Time	s	Read and write
Destage Function		Read and write
Destage Function Time	s	Read and write
Staging Threshold		Read and write
Destaging Threshold		Read and write
Staging Speed [RPM]	rpm	Read and write
Staging Speed [Hz]	Hz	Read and write
Destaging Speed [RPM]	rpm	Read and write
Destaging Speed [Hz]	Hz	Read and write
Lead Pump Alternation		Read and write
Alternation Event		Read and write
Alternation Time Interval	h	Read and write
Alternation Timer Value		Read
Alternation Predefined Time		Read and write
Alternate if Load < 50%		Read and write
Staging Mode at Alternation		Read and write
Run Next Pump Delay	s	Read and write
Run on Mains Delay	s	Read and write
Reset Relay Counters		Read and write
Inverse Interlock		Read
Compressor Interlock		Read and write
Manual Alternation		Read and write
Terminal X42/1 Mode		Read and write
Terminal X42/3 Mode		Read and write
Terminal X42/5 Mode		Read and write
Terminal X42/1 Low Voltage	V	Read and write
Terminal X42/1 High Voltage	V	Read and write
Term. X42/1 Low Ref./Feedb. Value		Read and write
Term. X42/1 High Ref./Feedb. Value		Read and write
Term. X42/1 Filter Time Constant	s	Read and write
Term. X42/1 Live Zero		Read and write
Terminal X42/3 Low Voltage	V	Read and write
Terminal X42/3 High Voltage	V	Read and write
Term. X42/3 Low Ref./Feedb. Value		Read and write
Term. X42/3 High Ref./Feedb. Value		Read and write
Term. X42/3 Filter Time Constant	s	Read and write
Term. X42/3 Live Zero		Read and write
Terminal X42/5 Low Voltage	V	Read and write
Terminal X42/5 High Voltage	V	Read and write
Term. X42/5 Low Ref./Feedb. Value		Read and write
Term. X42/5 High Ref./Feedb. Value		Read and write
Term. X42/5 Filter Time Constant	s	Read and write
Term. X42/5 Live Zero		Read and write
Terminal X42/7 Output		Read and write
Terminal X42/7 Min. Scale	%	Read and write
Terminal X42/7 Max. Scale	%	Read and write
Terminal X42/7 Bus Control	%	Read and write
Terminal X42/7 Timeout Preset	%	Read and write
Terminal X42/9 Output		Read and write
Terminal X42/9 Min. Scale	%	Read and write
Terminal X42/9 Max. Scale	%	Read and write
Terminal X42/9 Bus Control	%	Read and write
Terminal X42/9 Timeout Preset	%	Read and write
Terminal X42/11 Output		Read and write
Terminal X42/11 Min. Scale	%	Read and write
Terminal X42/11 Max. Scale	%	Read and write
Terminal X42/11 Bus Control	%	Read and write
Terminal X42/11 Timeout Preset	%	Read and write
Oil Return Management		Read and write
Low Speed Running Time	min	Read and write
Fixed Boost Interval	h	Read and write
Boost Duration	s	Read and write
Adequate Oil Return Speed [RPM]	rpm	Read and write
Adequate Oil Return Speed [Hz]	Hz	Read and write
Oil Boost Speed [RPM]	rpm	Read and write
Oil Boost Speed [Hz]	Hz	Read and write
Cancel Oil Boost at Low Feedback		Read and write
Cancel Oil Boost at High Feedback		Read and write
Temperature Source		Read and write
Temperature Unit		Read and write
Warning Level		Read and write
Warning Action		Read and write
Emergency Level		Read and write
Day/Night Bus Indicator		Read and write
Enable Day/Night Via Bus		Read and write
Night Setback		Read and write
Night Speed Drop [RPM]	rpm	Read and write
Night Speed Drop Override		Read and write
Night Speed Drop [Hz]	Hz	Read and write
dP0 Offset	K	Read and write
P0 Minimum Reference	K	Read and write
P0 Maximum Reference	K	Read and write
Most Loaded Controller		Read
Injection On		Read and write
Delayed Compressor Start		Read and write
Pre/Post Lube Function		Read and write
Pre Lube Time	s	Read and write
Post Lube Time	s	Read and write
Locked Rotor Protection		Read and write
Locked Rotor Detection Time [s]	s	Read and write
Monitor 1 Pressure Transmitter		Read and write
Monitor 1 Pressure Conversion		Read and write
Monitor 1 Pressure Source Unit		Read and write
Monitor 1 Temperature Unit		Read and write
Monitor 1 High Pres. Stop		Read and write
Monitor 1 High Pres. Start		Read and write
Monitor 1 Low Pres. Stop		Read and write
Monitor 1 Low Pres. Start		Read and write
Monitor 2 Pressure Transmitter		Read and write
Monitor 2 Pressure Conversion		Read and write
Monitor 2 Pressure Source Unit		Read and write
Monitor 2 Temperature Unit		Read and write
Monitor 2 High Pres. Stop		Read and write
Monitor 2 High Pres. Start		Read and write
Monitor 2 Low Pres. Stop		Read and write
Monitor 2 Low Pres. Start		Read and write
Monitor 2 Pressure Stop Ramp Time		Read and write
Heat Sink Fan Mode		Read and write
FC Type		Read
Power Section		Read
Voltage		Read
Software Version		Read
Ordered Typecode String		Read
Actual Typecode String		Read
Frequency Converter Ordering No		Read
Power Card Ordering No		Read
LCP Id No		Read
SW ID Control Card		Read
SW ID Power Card		Read
Frequency Converter Serial Number		Read
Power Card Serial Number		Read
Option Mounted		Read
Option SW Version		Read
Option Ordering No		Read
Option Serial No		Read
Option in Slot A		Read
Slot A Option SW Version		Read
Option in Slot B		Read
Slot B Option SW Version		Read
Option in Slot C0/E0		Read
Slot C0/E0 Option SW Version		Read
Option in Slot C1/E1		Read
Slot C1/E1 Option SW Version		Read
Defined Parameters		Read
Modified Parameters		Read
Parameter Metadata		Read

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If a device is not in the library yet, we build the template for free as soon as we have the register data.

Use cases

Show output frequency, motor current and power of each compressor drive on one ModbusCloud dashboard.
Send an email alert when the alarm word is not 0 so the service engineer knows a drive tripped.
Keep a year of suction pressure, P0 setpoint and pack capacity to spot short cycling or poor control.
Change the P0 setpoint or night setback remotely without a visit to the plant room.
Track running hours, number of starts and kWh per drive for maintenance planning and energy reports.

Installation

Connect RS485 terminals 68 (+) and 69 (-) of the drive to RS485 A and B of the ModbusCloud Gateway and set switch S801 to on at the last device on the bus.
On the drive set 8-30 Protocol to Modbus RTU, a unique address in 8-31 and the same baud rate and parity in 8-32 and 8-33 as in ModbusCloud.
In ModbusCloud add a Modbus device with the same address and serial settings and import this template.
Check that Frequency, Motor Voltage and DC Link Voltage show plausible values before you write any register.

Things to watch for

The drive does not answer on the bus. What should I check?

Check that 8-30 is set to Modbus RTU and not to FC protocol, and that address, baud rate and parity in 8-31 to 8-33 match ModbusCloud. Swap A and B if needed and set the termination switch only at both ends of the line.

Why do some parameters show strange values or change when I read again?

Many parameters are arrays, such as preset references or log entries. The drive returns the element set in the Array Index Pointer register. Write the index you want there first, then read the parameter.

Can I write parameters, and are the changes kept after a restart?

Yes, every setting is writable, but some only with the motor stopped. Coil 65, Parameter Write Control, decides where writes go: 0 keeps them in RAM only, 1 also stores them in EEPROM. Read a value first and change one parameter at a time, because a wrong ramp or limit can stop the compressor.

How do I start the drive and set its speed over Modbus?

Write the control word to Bus Control Word or to the control coils and the speed reference to Bus Reference, where 0x4000 equals 100 percent. The Data Valid bit must be 1, and 8-50 and related parameters decide whether the bus or the digital inputs have priority.

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