Multi-Function Meter (MFM): Wiring, CT/PT Programming & Parameters
1 - Digital Multi Function Meter:
MF meter is an instrumental measuring device which is installed on electrical panel. It measures many type parameters. It works on digital program which can be editable as per requirement.
A MF meter is used for monitoring and measuring the electrical parameters such as active power, voltage, current,apparent power, power factor, reactive power,phase angle, Active energy etc.
2 - Connection Diagram:
MFM Programming & BMS Integration Checklist
- CT Ratio Setup: Set CT Primary (e.g., 400A) and CT Secondary (5A or 1A) accurately, otherwise kW/kWh readings will be wrong.
- PT Ratio Setup: Keep 415V/415V (1:1) for LT panels; set 11000V/110V for 11kV HT panels.
- RS485 Modbus: Assign unique Slave ID (1–247) and Baud Rate (9600 bps) for SCADA/BMS energy monitoring.
3 - Types of parameters of MF Meter:
- Voltage:- RY, YB, RB, RN, YN, BN.
- Current:- R, Y, B, N
- Phase wise load in % : three current in % of full load.
- Unbalance load in % : Current and voltage unbalance in %.
- Power factor:- pf1, pf2, pf3
- Power: VA, W, VAR, per phase and total.
- Energy:VAh, Wh, + VARh.
- Auxiliary supply: 44V to 277 Volt.
- Frequency: +/- 5 %
- Input current: 50mA to 6A
4 - Applications of Multi Function Meter:
MF meter are used in india or global in widely. It can be used easily in electrical panels, DG incomer panel, Water treatment plant, chiller plant, production houses for motor control panel etc.
