Modbus RTU
Janitza UMG 96-PA
Janitza
Power analyzer for switchboards: voltage, current, power, energy, power factor and THD over Modbus RTU on RS485.
Overview
The Janitza UMG 96-PA is a power analyzer for switchboards and distribution panels, also available as MID and MID+ version for billing. Over Modbus RTU on its RS485 interface it reports voltages, currents, power, energy, power factor, frequency and harmonic distortion. This template follows the Modbus address list in the Janitza UMG 96-PA user manual (doc. no. 2.061.015.3d, firmware up to 1.12) and reads 38 float registers from address 19000: voltages L-N and L-L, currents, active, apparent and reactive power per phase and total, cos phi, imported and exported energy and THD. Default link: device address 1, baud rate auto, 8 data bits, no parity, 1 stop bit.
Key readings
- Voltage per phase, L-N and L-L
- Current per phase and sum
- Active power per phase and total
- Apparent and reactive power
- Power factor per phase and frequency
- Imported and exported active energy
- Voltage and current THD
Use cases
- Track Active Power Total per feeder to see which group causes the peak and when.
- Alert when Voltage L1-N, L2-N or L3-N drops below a set limit, so a failing supply or a blown fuse is noticed.
- Compare Current L1, L2 and L3 to find an unbalanced distribution board before the neutral overheats.
- Report monthly consumption per board from Active Energy Imported and feed-in from Active Energy Exported.
- Watch THD Current per phase to spot harmonic load from drives and LED drivers.
Installation
- 1Connect A, B and Data GND of the UMG 96-PA RS485 plug to the RS485 port of your ModbusCloud Gateway with twisted pair cable. Fit a 120 ohm termination resistor at both ends of the bus; the device has none built in.
- 2On the device, open the Communication menu and set a unique device address (default 1), the baud rate (default Auto) and the data frame (default 1 stop bit, no parity).
- 3In ModbusCloud, add a Modbus device (RTU) with address 1, 19200 baud, 8 data bits, no parity and 1 stop bit, and import this template. With baud rate Auto the device follows the speed of the master.
- 4Check the link: Voltage L1-N must show the mains voltage and Frequency about 50 Hz. If nothing answers, swap A and B and check the device address.
Things to watch for
- The UMG 96-PA does not answer. What should I check?
- Check that the device address in ModbusCloud matches the Communication menu (default 1) and that the data frame matches (default no parity, 1 stop bit). If baud rate Auto does not lock, set a fixed baud rate on both sides. Then swap A and B and check that the bus is terminated with 120 ohm at both ends.
- Values look like random large numbers.
- The registers are 32-bit floats and need two registers per value. Reading a single register or swapping the words gives nonsense. The template reads each value as float32 with the high word first, starting at an even address such as 19000.
- Why are the energy values in Wh and not kWh?
- The UMG 96-PA reports active energy in Wh and reactive energy in varh as floats. Divide by 1000 for kWh in a report. The device stores energy values every 5 minutes, so after a power cut up to 5 minutes of counting can be missing.
- Several meters share one RS485 bus. Anything special?
- Give each UMG 96-PA its own device address from 1 to 250 and the same baud rate and data frame. A segment holds up to 32 devices. Use shielded twisted pair cable, not CAT cable, and terminate only the two ends. The ModbusCloud Gateway must be the only master on the line.
- Power or current is off by the transformer ratio.
- The device scales with the current and voltage transformer ratios set in its Measurement menu (default 5 A to 5 A, 400 V to 400 V). If the ratio there is wrong, the Modbus values are wrong too. Correct the primary and secondary values on the device.
Registers (38)
38 read / 0 write
| Name | Address | Function | Type | Unit | Access |
|---|---|---|---|---|---|
Voltage L1-N Phase voltage L1 to neutral in V, float. Janitza variable _ULN[0]. | ••• | ••• | ••• | V | R |
Voltage L2-N Phase voltage L2 to neutral in V, float. Janitza variable _ULN[1]. | ••• | ••• | ••• | V | R |
Voltage L3-N Phase voltage L3 to neutral in V, float. Janitza variable _ULN[2]. | ••• | ••• | ••• | V | R |
Voltage L1-L2 Line voltage L1-L2 in V, float. Janitza variable _ULL[0]. | ••• | ••• | ••• | V | R |
Voltage L2-L3 Line voltage L2-L3 in V, float. Janitza variable _ULL[1]. | ••• | ••• | ••• | V | R |
Voltage L3-L1 Line voltage L3-L1 in V, float. Janitza variable _ULL[2]. | ••• | ••• | ••• | V | R |
Current L1 Apparent current L1 in A, float. Janitza variable _ILN[0]. | ••• | ••• | ••• | A | R |
Current L2 Apparent current L2 in A, float. Janitza variable _ILN[1]. | ••• | ••• | ••• | A | R |
Current L3 Apparent current L3 in A, float. Janitza variable _ILN[2]. | ••• | ••• | ••• | A | R |
Current Sum Sum of the three phase currents, I1 + I2 + I3, in A, float. Janitza variable _I_SUM3. | ••• | ••• | ••• | A | R |
Active Power L1 Active power L1 in W, float, signed. Janitza variable _PLN[0]. | ••• | ••• | ••• | W | R |
Active Power L2 Active power L2 in W, float, signed. Janitza variable _PLN[1]. | ••• | ••• | ••• | W | R |
Active Power L3 Active power L3 in W, float, signed. Janitza variable _PLN[2]. | ••• | ••• | ••• | W | R |
Active Power Total Total active power P1 + P2 + P3 in W, float, signed. Janitza variable _P_SUM3. | ••• | ••• | ••• | W | R |
Apparent Power L1 Apparent power L1 in VA, float. Janitza variable _SLN[0]. | ••• | ••• | ••• | VA | R |
Apparent Power L2 Apparent power L2 in VA, float. Janitza variable _SLN[1]. | ••• | ••• | ••• | VA | R |
Apparent Power L3 Apparent power L3 in VA, float. Janitza variable _SLN[2]. | ••• | ••• | ••• | VA | R |
Apparent Power Total Total apparent power S1 + S2 + S3 in VA, float. Janitza variable _S_SUM3. | ••• | ••• | ••• | VA | R |
Reactive Power L1 Reactive power at fundamental frequency L1 in var, float. Janitza variable _QLN[0]. | ••• | ••• | ••• | var | R |
Reactive Power L2 Reactive power at fundamental frequency L2 in var, float. Janitza variable _QLN[1]. | ••• | ••• | ••• | var | R |
Reactive Power L3 Reactive power at fundamental frequency L3 in var, float. Janitza variable _QLN[2]. | ••• | ••• | ••• | var | R |
Reactive Power Total Total reactive power Q1 + Q2 + Q3 in var, float. Janitza variable _Q_SUM3. | ••• | ••• | ••• | var | R |
Power Factor L1 Fundamental power factor cos phi for UL1 and IL1, float. Janitza variable _COS_PHI[0]. | ••• | ••• | ••• | R | |
Power Factor L2 Fundamental power factor cos phi for UL2 and IL2, float. Janitza variable _COS_PHI[1]. | ••• | ••• | ••• | R | |
Power Factor L3 Fundamental power factor cos phi for UL3 and IL3, float. Janitza variable _COS_PHI[2]. | ••• | ••• | ••• | R | |
Frequency Mains frequency in Hz, float. The device calculates it automatically between 45 and 65 Hz. Janitza variable _FREQ. | ••• | ••• | ••• | Hz | R |
Phase Sequence Rotation field: 1 = right (clockwise), 0 = none, -1 = left, float. Janitza variable _PHASE_SEQ. | ••• | ••• | ••• | R | |
Active Energy Imported Active energy L1 to L3 obtained (imported), tariff 1, in Wh, float. Janitza variable _WH_V_HT_SUML13. | ••• | ••• | ••• | Wh | R |
Active Energy Exported Active energy L1 to L3 supplied (exported), in Wh, float. Janitza variable _WH_Z_SUML13. | ••• | ••• | ••• | Wh | R |
Apparent Energy Total Apparent energy L1 to L3 in VAh, float. Janitza variable _WH_S_SUML13. | ••• | ••• | ••• | VAh | R |
Reactive Energy Inductive Inductive reactive energy L1 to L3 in varh, float. Janitza variable _IQH_SUML13. | ••• | ••• | ••• | varh | R |
Reactive Energy Capacitive Capacitive reactive energy L1 to L3 in varh, float. Janitza variable _CQH_SUML13. | ••• | ••• | ••• | varh | R |
THD Voltage L1 Total harmonic distortion of voltage L1-N in %, float. Janitza variable _THD_ULN[0]. | ••• | ••• | ••• | % | R |
THD Voltage L2 Total harmonic distortion of voltage L2-N in %, float. Janitza variable _THD_ULN[1]. | ••• | ••• | ••• | % | R |
THD Voltage L3 Total harmonic distortion of voltage L3-N in %, float. Janitza variable _THD_ULN[2]. | ••• | ••• | ••• | % | R |
THD Current L1 Total harmonic distortion of current L1 in %, float. Janitza variable _THD_ILN[0]. | ••• | ••• | ••• | % | R |
THD Current L2 Total harmonic distortion of current L2 in %, float. Janitza variable _THD_ILN[1]. | ••• | ••• | ••• | % | R |
THD Current L3 Total harmonic distortion of current L3 in %, float. Janitza variable _THD_ILN[2]. | ••• | ••• | ••• | % | R |
Loading registers…
Read the Janitza UMG 96-PA remotely
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Based in the Netherlands
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