Circutor CVM-C10

Compatibility

Compatible with EpiSensor Edge over Modbus RTU

Circutor documents Modbus RTU on the RS-485 port, FC03 and FC04 reads, a hexadecimal memory map and its own example request and reply for L1 voltage. This is documented compatibility, without a physical Edge test.

CVM-C10-ITF-485-ICT2, code M55911, with the English instruction manual M001B01-03-23A. Circutor lists M55911 as replaced by the CVM-C11-ITF-IN-485-ICT2 (M58541), which has its own documentation and is not covered here. The ITF-IN, MC, MC-IN, mV and FLEX versions share the manual and map but have different current inputs. Read-only monitoring over Modbus RTU; BACnet is a separate protocol choice on the same port.

Connect it with

• Modbus Interface ZMB-3X From €399 ex VAT Configure
• Gateway ZGW-20 From €899 ex VAT Configure

Models

Specifications

A 96 x 96 mm panel analyser for low and medium voltage installations, measuring four quadrants through external current transformers. The order code fixes the current input; the setup menu fixes the wiring system, transformer ratios and the protocol on the RS-485 port.^1, 2

Exact reference

CVM-C10-ITF-485-ICT2, code M55911. Circutor names CVM-C11-ITF-IN-485-ICT2 (M58541) as the replacement.¹

Current inputs

Three inputs for .../5 A or .../1 A transformers, programmed in the setup menu. Measuring range 2 to 120% In, minimum 10 mA.^1, 2

Voltage inputs

300 V phase to neutral, 520 V phase to phase, measuring 5 to 120% Un at 45 to 65 Hz. CAT III 300 V.²

Wiring systems

Three-phase 4-wire, three-phase 3-wire, ARON, two-phase 3-wire and single-phase 2-wire, phase to phase or phase to neutral.²

Auxiliary supply

95 to 240 VAC ±10%, 50/60 Hz, 4 to 6 VA. The manual limits the DC supply option to specific references such as M5591100F0000, so check the label before using a DC supply.^1, 2

Accuracy (ITF)

Voltage and current 0.5% ±1 digit, active power 0.5% ±2 digits. Active energy class 0.5S (I ≥ 0.1 In) to IEC 62053-22, reactive energy class 1 to IEC 62053-24.²

RS-485

Terminal 9 A(+), 10 B(-), 11 GND shared with the digital inputs. Modbus RTU or BACnet MS/TP, one at a time.²

Serial settings

9600 or 19200 bit/s; no, even or odd parity; 7 or 8 data bits; 1 or 2 stop bits; peripheral number 0 to 255.²

Inputs and outputs

Two relay outputs (250 VAC, 6 A), two NPN transistor pulse outputs (24 V, 50 mA) and two digital inputs for tariff selection.²

Environment

Operating -10 to +60 °C, storage -10 to +65 °C, 5 to 95% relative humidity without condensation, up to 2000 m.²

Enclosure

Panel mounting, self-extinguishing V0 plastic. Front IP51 (IP64 with accessory), rear IP21. 96.7 x 96.7 x 62.5 mm, 330 g.²

Interface

Documented measurements and integration boundaries for CVM-C10.

• L1, L2 and L3 phase voltage at 0x0000, 0x0010 and 0x0020 (decimal 0, 16, 32): two registers each, V x 10.
• L1, L2 and L3 current at 0x0002, 0x0012 and 0x0022 (decimal 2, 18, 34): two registers each, in mA.
• Three-phase active power at 0x0030 (decimal 48): two registers in W. The table's symbol says kW III, but its units column says W.
• Three-phase apparent power at 0x0036 (decimal 54) in VA and three-phase power factor at 0x0038 (decimal 56) x 100.
• Frequency at 0x003C (decimal 60): two registers, Hz x 100. Line voltages V12, V23 and V31 at 0x003E, 0x0040 and 0x0042, V x 10.
• Total consumed active energy at 0x00DC (decimal 220) in kWh with a separate Wh register at 0x00DE (decimal 222). Total generated active energy at 0x00F0 (decimal 240) in kWh with Wh at 0x00F2 (decimal 242). Tariff 1 to 3 counters have their own addresses.
• Power status at 0x07D1 (decimal 2001), FC04: bit 0 consumed, bit 1 generated, bit 2 inductive, bit 3 capacitive.
• All values are read with FC03 or FC04, high word first. One request may carry at most 20 variables (40 registers).

Setup

1. Identify the meter

   Read the order code on the label and confirm CVM-C10-ITF-485-ICT2 (M55911). Confirm the wiring system and the CT primary and secondary with the installer, and check that the meter's installation type and transformer ratios match them.

2. Select Modbus on the RS-485 port

   In the setup menu, the RS-485 protocol screen chooses Modbus or BACnet. Choose Modbus, then record the speed, peripheral number, parity, data bits and stop bits. The meter restarts when you leave the menu after changing them.

3. Wire the bus

   Connect A(+) to terminal 9, B(-) to terminal 10 and the reference to terminal 11, using shielded twisted pair. Circutor allows up to 32 meters and 1200 m on one bus. Give each meter its own peripheral number; avoid 0, which Modbus reserves for broadcast.

4. Read L1 voltage first

   Send FC04 (or FC03) to address 0x0000 for two registers, as in the worked read below. Combine the high word first and divide by 10 for volts, then compare with the L1 voltage on the display.

5. Add current, power and energy

   Add current at 0x0002 in mA, three-phase active power at 0x0030 in W and total consumed energy at 0x00DC in kWh with the Wh register at 0x00DE. Check each against the display, including the programmed transformer ratios, before saving the point.

6. Keep the meter read-only

   The map also lists FC05 commands that delete energy counters and FC10 configuration registers. Do not send them from a monitoring client. Use the front-panel programming lock to protect the setup.

Common questions

Is 0x0000 the address I enter, or 30001?

The manual states that all memory map addresses are hexadecimal, and its example frame sends 0000 as the initial register. Enter 0x0000 in a client that takes zero-based addresses. A client with one-based Modicon labels calls the same register 30001 (FC04) or 40001 (FC03).²

Is active power in kW or W?

W. The memory map labels the rows kW 1 and kW III, but its units column gives W for active power, var for reactive power and VA for apparent power. Divide by 1000 only if the destination expects kW.²

How are the energy counters stored?

Each counter has a kWh register pair and a separate Wh register pair: total consumed active energy is 0x00DC in kWh and 0x00DE in Wh, total generated is 0x00F0 and 0x00F2. Consumption and generation are separate counters. Compare the pair with the display before you decide how to combine them.²

Can the same port run BACnet and Modbus?

Not at once. The setup menu selects Modbus or BACnet for the one RS-485 port, and the manual says BACnet needs firmware 3.00 or later. This guide covers the Modbus RTU selection only.²