GE PQM-T20-C-A PQM II Series Industrial Power Quality Meter
Manufacturer: GE Fanuc
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Part Number: PQM-T20-C-A
Condition：New with Original Package
Product Type: Power Quality Meters
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Country of Origin: USA
Payment:T/T, Western Union
Shipping port: Xiamen
Warranty: 12 months
GE PQM-T20-C-A PQM II Power Quality Meter
The GE PQM-T20-C-A, also cataloged as the PQM-T20-C-A Power Quality Meter, operates as a dedicated hardware component for electrical parameter monitoring and harmonic distortion capture within SCADA and energy management platforms. The unit processes 32-bit digital signal sampling across 90 to 600 V L-L potential inputs and 0.1 to 20 A current inputs, executing real-time calculation of power factor, demand, and harmonic spectrum up to the 50th order.
Hardware Specifications
| Parameter | Specification |
|---|---|
| Model | PQM-T20-C-A |
| Brand | GE |
| Origin | USA |
| Weight | 3.0 lbs |
| Dimensions | 96 x 96 x 75 mm |
| Operating Temp | -10 to +55 deg C |
| Power Consumption | Approximately 20 VA |
| Measurement Class | 0.5S accuracy class |
| Control Power Supply | 20 to 60 VDC or 20 to 48 VAC (50/60 Hz) |
| Voltage Input Range | 90 to 600 V L-L via VT scaling |
| Current Input Range | 0.1 to 20 A via CT scaling |
| Analog Inputs | 1 channel (4-20 mA) |
| Analog Outputs | 4 isolated channels (programmable) |
| Digital Inputs | 4 discrete switch inputs |
| Relay Outputs | 4 programmable output relays |
| Serial Interface | RS-485 Modbus RTU (rear) / RS-232 (front) |
| Ethernet Interface | Modbus TCP/IP |
| Waveform Memory | 10,000 event log buffer with disturbance capture |
Backplane Bus Communication Velocity & Firmware Flash Compatibility
The GE PQM-T20-C-A utilizes deterministic Modbus TCP/IP and RS-485 Modbus RTU protocols to ensure rapid data transmission across industrial communications buses. The internal micro-controller executes real-time harmonic analysis and waveform capture without introducing latency to control output relays or analog telemetry loops. Field-upgradable firmware flash compatibility ensures continuous protocol harmonization across updated SCADA software revisions, while maintaining high I/O density scaling through integrated discrete inputs and isolated analog outputs.
Frequently Asked Questions
Q: How does the PQM-T20-C-A capture rapid line voltage disturbances and harmonics?
A: The meter continually digitizes incoming voltage and current waveforms, storing up to 10,000 timestamped disturbance events and calculating Total Harmonic Distortion (THD) and Total Demand Distortion (TDD) up to the 50th order.
Q: What auxiliary supply voltage must be supplied to power the PQM-T20-C-A unit?
A: The internal power supply board requires a control voltage source rated between 20 to 60 VDC or 20 to 48 VAC at 50/60 Hz, consuming roughly 20 VA during active operation.
Q: Can the 4-20 mA analog outputs be mapped directly to power parameters?
A: Yes, all four onboard isolated analog outputs can be independently configured in software to retransmit measured parameters such as real power, phase current, or frequency to downstream control systems.
Field Installation Guidelines
Mount the PQM-T20-C-A into a standard DIN 96 x 96 mm panel cutout, tightening the side-mounting brackets securely against the enclosure door. Ensure adequate rear clearance for terminal block wiring and RS-485/Ethernet communication cables.
Wire current transformer (CT) secondary leads using twisted-pair wiring shorting blocks to prevent open-circuit high-voltage hazards during maintenance. Connect the metal enclosure shield wire to a single-point low-impedance earth ground stud to prevent common-mode noise interference on sensitive analog input and output loops.