Controls speed and torque of 3-phase motors via a variable speed drive.
Overview
Template for the LS ELECTRIC LSLV-S100 AC variable speed drive over Modbus RTU. Read operation status and write frequency setpoints and drive commands directly from the ModbusCloud platform.
Key readings
Operation status
Available commands
Frequency
Drive command
Use cases
Monitor the real-time operation status of an LSLV-S100 drive on a cloud dashboard from any location.
Adjust the motor frequency setpoint remotely to optimize airflow in an HVAC ventilation system.
Send drive start and stop commands from the ModbusCloud platform to control pump or fan operation.
Create alerts when the drive enters a fault state so a technician can respond without delay.
Log operating frequency over time to analyze energy consumption and identify optimization opportunities.
Verify correct motor speed after a remote setpoint change without visiting the site.
Installation
1Wire the RS-485 A and B terminals of the ModbusCloud gateway (MCG or MLP series) to the corresponding RS-485 communication terminals on the LSLV-S100 drive.
2On the LSLV-S100 keypad or parameter group, set the Modbus slave address, baud rate to 9600, data bits to 8, and parity to match the gateway configuration.
3Enable Modbus RTU communication on the drive by setting the appropriate communication source parameter so the drive accepts commands over the serial bus.
4In the ModbusCloud platform, add a new device and import the LSLV-S100 template, then assign the correct Modbus slave address.
5Verify the connection by checking that the operation status register returns a valid value on the ModbusCloud dashboard.
Things to watch for
01
The gateway cannot communicate with the LSLV-S100. What should I check?
Verify that the RS-485 wiring is correct, with A connected to A and B to B. Confirm the slave address, baud rate (9600), data bits, and parity settings match between the drive and the gateway. Also ensure no other device on the bus shares the same slave address.
02
I can read status but cannot write frequency or drive commands. Why?
The LSLV-S100 must be configured to accept commands via Modbus rather than from the local keypad. Check the drive's frequency command source and run command source parameters, and set them to the communication option.
03
What RS-485 termination is needed on the bus?
If the LSLV-S100 is the last device on the RS-485 bus, enable or install a 120 ohm termination resistor at the drive end. A matching termination resistor should also be present at the gateway end of the bus.
04
The frequency value displayed in ModbusCloud seems incorrect or scaled wrong. How do I fix this?
LS ELECTRIC drives typically represent frequency in units of 0.01 Hz in the Modbus register. Ensure the template scaling factor is set to divide the raw register value by 100 to display the correct frequency in Hz.
Registers (3)
1 read / 2 write
Name
Address
Function
Type
Unit
Access
Operation status
13
FC04
uint16
R
frequency
4
FC06
int16
W
drive comand
5
FC06
uint16
W
Working with Modbus in your projects?
ModbusCloud is the hardware-plus-software platform that installers use to monitor, visualise and control Modbus devices from one portal. This template is one of hundreds you can use right away.
