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GE Multilin PQMII-C Power Quality Meter II

Configured for electrical power measurement and control signal execution in switchgear monitoring networks, the GE Multilin PQMII-C (PQMII Power Quality Meter II) provides direct physical/electrical execution through voltage, current, relay, digital input, and communication interfaces.

Hardware Specifications

Parameter	Specification
Model	PQMII-C
Brand	GE Multilin
Operating Temp	-10 deg C to +60 deg C
Power Consumption	10 VA maximum, 15 VA nominal
Power Supply	90-300 VAC (40-70 Hz) / 100-300 VDC; optional 20-60 VDC or 20-48 VAC
Voltage Input	Up to 600 VAC line-to-line / 347 VAC line-to-neutral
Current Input	1 A or 5 A CT secondary, 0.02 to 12 A continuous measurement range
Measurement Accuracy	Voltage and current +/- 0.5% full scale; power and energy +/- 1.0%
Harmonic Analysis	THD measurement up to 31st harmonic
Communication Interface	RS232 front port and RS485 rear port with Modbus RTU
Communication Speed	Up to 19,200 bps
Control Relays	4 Form-C (SPDT) relays, 10 A continuous at 250 VAC / 30 VDC
Digital Inputs	4 switch inputs for status monitoring and remote reset

Modbus RTU Communication and Power Quality Processing

The PQMII-C integrates electrical measurement acquisition with Modbus RTU communication through its rear RS485 interface. The meter processes voltage, current, frequency, real power, reactive power, apparent power, energy accumulation, and power factor data for SCADA, DCS, and PLC system integration.

The unit performs power quality analysis by calculating total harmonic distortion (THD) for voltage and current signals up to the 31st harmonic. Event recording functions capture voltage sag, voltage swell, peak demand, minimum and maximum values, and historical trend information.

The control option identified by the "-C" suffix provides programmable relay outputs, digital status inputs, and optional analog output functions for switchgear automation sequences. The hardware configuration supports control logic execution based on measured electrical parameters and recorded events.

Frequently Asked Questions (FAQ)

Q: What communication protocol is supported by the PQMII-C for automation integration?
A: The PQMII-C supports Modbus RTU communication through the rear RS485 interface and provides a front RS232 port for local configuration.

Q: What type of current transformer inputs are accepted by the PQMII-C?
A: The meter accepts field-configurable 1 A or 5 A nominal CT secondary inputs with continuous measurement from 0.02 to 12 A for 5 A nominal CT applications.

Q: What control hardware is included in the "-C" variant?
A: The "-C" control option includes four Form-C relay outputs and four digital inputs for alarm, status monitoring, and remote control functions.

Field Installation Guidelines

Install the PQMII-C in an enclosure suitable for the specified operating environment. Maintain separation between low-level communication wiring and high-voltage measurement conductors to reduce electrical interference.

Connect voltage inputs according to the configured system voltage and PT secondary settings. CT wiring should maintain correct polarity and avoid open-circuit conditions during operation. Use shielded communication cable for RS485 networks and terminate the communication bus according to the applicable Modbus RTU installation practice.

Verify auxiliary power supply compatibility before energizing the meter. Confirm relay output wiring, digital input connections, and grounding arrangements before commissioning the measurement and control functions.

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