Description

ABB SSAC PLMU11 Three-Phase Voltage Relay Monitor 1404

The PLMU11 continuously measures the voltage of each of the three phases to provide protection for 3-phase motors and sensitive loads. Its microcontroller senses under and overvoltage, voltage unbalance, phase loss, and phase reversal. Protection is provided even when regenerated voltages are present. Universal voltage operation from 200 to 480 VAC and standard base connection allows the PLMU11 to replace hundreds of competitive part numbers.

Operations of SSAC PLMU11 Three-Phase Voltage Relay Monitor

Upon application of power, a 0.6s random start delay begins and the PLMU11 measures the voltage levels and line frequency and selects the voltage range. The output relay is energized and the LED glows green when all voltages are acceptable and the phase sequence is correct. LED flashes green during trip delay, glows red when output de-energizes. under voltage, overvoltage, and voltage unbalance must be sensed for continuous trip delay before the relay de-energizes. Reenergization is automatic upon fault correction. The output relay will not energize if a fault condition is sensed as 3-phase input voltage is applied. The LED alternately flashes red/green when phase reversal is sensed. Line voltage is selected with the knob, setting the over and under voltage trip points. Voltage range is automatically selected by the microcontroller.

Features & Benefits of ABB SSAC PLMU11 Three-Phase Voltage Relay Monitor

• Quick octal 8-pin mounting: Small footprint with universal mounting: ideal replacement for hundreds of competitive part numbers.
• Proprietary microcontroller based circuitry: Constant monitoring of single-phase, low voltage, high voltage, voltage unbalance, phase reversal.
• LED diagnostics: Quick visual indicator for cause of trip. LED indications include: normal operation, trip delay, phase reversal, fault
• Isolated, 10A, SPDT output contacts: Allows control of loads for AC voltages.
• Simple 3-wire connection for delta or wye systems: Allows flexibility across wide range of systems
• ASME A17.1 Rule 210.6: Complies with safety codes for elevators, escalators, moving walkways
• NEMA MG1 14:30, 14:35: Complies with safety codes for motors and generators
• IEEE C62.41-1991 Level B: Complies with safety codes for surge and voltage protection