Circutor CVM-MINI

Use cases

• Monitor three-phase voltage and current per phase on a live cloud dashboard for facility management.
• Track active and reactive energy consumption over time to identify usage patterns and reduce costs.
• Create alerts when power factor drops below a defined threshold to avoid utility penalties.
• Compare per-phase load distribution to detect imbalance in three-phase industrial installations.
• Log THD values for voltage and current to assess power quality and plan corrective measures.
• Generate periodic energy reports for tenants or departments in a sub-metered building.

Installation

1. 1Wire the RS-485 A and B terminals of the CVM-MINI to the corresponding terminals on your ModbusCloud gateway (MCG or MLP series).
2. 2On the CVM-MINI front panel, verify that the Modbus RTU slave address is set to a unique value on the bus and note this address.
3. 3Confirm the baud rate on the CVM-MINI is set to 9600, matching the default template configuration.
4. 4Power on the ModbusCloud gateway and connect it to your local network or use its cellular connection.
5. 5In the ModbusCloud platform, import the Circutor CVM-MINI template and assign the correct Modbus slave address.
6. 6Verify that live readings on the ModbusCloud dashboard match the values shown on the CVM-MINI display.

Things to watch for

01

Why do current values appear very large on the dashboard?

The CVM-MINI reports current in milliamps (mA). Ensure the template scaling is applied correctly so values display in amps. If you customized the template, divide the raw register value by 1000.

02

Some apparent power readings seem to come from unexpected register addresses. Is this normal?

Yes. The CVM-MINI uses non-contiguous register addresses for apparent power per phase (e.g., address 74 for L1). The template already maps these correctly, so no manual adjustment is needed.

03

What RS-485 wiring is required?

Connect A and B differential lines from the CVM-MINI to the gateway. Use a twisted pair cable and add a 120 ohm termination resistor at the last device on the bus if the cable run exceeds a few meters.

04

Can I connect multiple CVM-MINI devices on one Modbus bus?

Yes. Assign each CVM-MINI a unique Modbus slave address via its front panel menu. Then add a separate device entry in ModbusCloud for each unit, all using the same template.

Registers (48)

48 read / 0 write

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