3 Phase SPDT Voltage Monitor (240V)

The PLM Series is a 3-phase voltage monitor that continuously monitors each of the three phases. Monitors both delta and wye systems and no connection to neutral is required. The microcontroller circuit design protects against undervoltage, voltage unbalance, phase loss and phase reversal. Protection is assured when regenerated voltages are present.

Operation
The output relay is energized and the LED glows green when all voltages are acceptable and the phase sequence is correct. Under and unbalanced voltages must be sensed for a continuous trip delay period before the relay de-energizes. Reset is automatic upon correction of the fault condition. The output relay will not energize if a fault condition is sensed as power is applied. The LED flashes red during the trip delay, then glows red when the output de-energizes. The LED flashes green/red if phase reversal is sensed.

Field Adjustment
Set voltage adjustment knob at the desired operating line voltage for the equipment. This adjustment automatically sets the undervoltage trip point. Apply power. If the PLM fails to energize, (LED glows red) check wiring of all 3 phases, voltage, and phase sequence. If phase sequence is incorrect, the LED flashes green/red. To correct this, swap any two line voltage connections at the mounting socket. No further adjustment should be required.

Specifications:

• Input Voltage (V): 200 to 240VAC
• Input Voltage Maximum (V): 270VAC
• Input Type: 3-phase delta or wye with no connection to neutral
• Input AC Line Frequency (Hz): 50/100Hz
• Input Phase Sequence: ABC
• Output Type: Electromechanical relay
• Output Form: Isolated SPDT
• Output Load Rating (VA): 10A resistive @ 240VAC 277VAC max; 1/2hp @ 240VAC; 1/4hp @ 120VAC
• Reset Time (ms): Automatic
• Response Time (ms): Phase loss: 200ms; Phase reversal: 200ms
• Trip Delay Range: 5s fixed
• Trip Delay Tolerance (%): 15%
• Undervoltage Trip Voltage: 88-92% of the adjusted line voltage
• Undervoltage Reset Voltage (%): 3% of the trip voltage
• Voltage Unbalance Trip Point (%): 4% fixed
• Voltage Unbalance Reset (%): -0.7% unbalance typical
• Phase Loss: 35% unbalance
• Power Consumption: 2W
• Isolation Voltage (V): 2500V RMS input to output
• Surge Protection: IEEE C62.41-1991 Level B
• Type of Detection: Voltage detection with delayed trip and automatic reset
• Life: Mechanical - 1 x 106; Electrical - 1 x 105
• Termination Type: Octal 8-pin plug-in rated 600VAC
• Mounting Method: Plug-in socket
• Operating Temperature: -40° to 60°C (-40°F to 140°F)
• Storage Temperature (F/C): -40° to 85°C (-40°F to 185°F)
• Dimensions: 3.20 x 2.39 x 1.78 in. (81.3 x 60.7 x 45.2mm)