Protection Relays Voltage Monitoring Relays PLMU11 Voltage Monitor Description 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 and standard base connection allows the PLMU11 to replace hundreds of competitive part numbers. Operation 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 8-PIN 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. Undervoltage, overvoltage, and voltage unbalance must be sensed for continuous trip delay before the relay de-energizes. Re-energization 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 Wiring Diagram 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. F = Fuses LED Indicator A = Phase A = L1 B = Phase B = L2 Steady Green Energized C = Phase C = L3 Steady Red De-engergized (tripped on fault) NO = Normally Open NC = Normally Closed Flashing Green Trip Delay Alternate Flashing Red/Green Phase Reversal 2A fast acting fuses recommended for safety (not required). Features & Benefits Relay contacts are isolated FEATURES BENEFITS Small footprint with universal mounting: ideal Quick octal 8-pin replacement for hundreds of competitive mounting part numbers. Proprietary Constant monitoring of single-phase, low voltage, microcontroller high voltage, voltage unbalance, phase reversal. based circuitry Quick visual indicator for cause of trip. LED LED diagnostics indications include: normal operation, trip delay, phase reveral, fault Isolated, 10A, SPDT Allows control of loads for AC voltages output contacts Simple 3-wire connection Allows flexibility across wide range of systems for delta or wye systems Complies with safety codes for elevators, ASME A17.1 Rule 210.6 escalators, moving walkways Complies with safety codes for motors NEMA MG1 14:30, 14:35 and generators Complies with safety codes for surge and IEEE C62.41-1991 Level B voltage protection 2016 Littelfuse Protection Relays & Controls Rev: 1-A-062116 www.littelfuse.com/plmu11Protection Relays Voltage Monitoring Relays PLMU11 Accessories Specifications Line Voltage BZ1 Front Panel Mount Kit Type 3-phase delta or wye with no connection Provides an easy method of through-the-panel to neutral mounting of 8-pin or 11-pin plug-in timers, Line Voltage 200 to 480VAC 15%, 50/60 Hz 2 Hz ashers, and other controls.fl Adjustable Voltage Ranges (Automatic Range Selection) 200 to 240VAC, 50/60 Hz OT08PC Octal 8-pin Socket 340 to 420VAC, 50 Hz 8-pin 35mm DIN rail or surface mount. Rated at 400 to 480VAC, 60 Hz 10A 600VAC. Surface mounted with two 6 Maximum Voltage 552VAC screws or snaps onto a 35 mm DIN rail. Phase Sequence ABC LPSM003ZXID (Indicating), Power Consumption 5W LPSM003Z (Non-indicating) Fuse Holders Overvoltage, Undervoltage, Littelfuse POWR-SAFE Dead Front holders & Voltage Unbalance provide optimum protection to personnel for Type Voltage detection with delayed trip and Class CC and Midget-Style fuses. 600 VAC/DC automatic reset Overvoltage & Undervoltage 0KLK002.T Midget Fuse (2 Amp) Undervoltage Trip Point 88 - 92% of adjusted line voltage 10 x 38 fast acting, high-interrupting capacity, Reset Voltage +2% of trip voltage current-limiting type fuse. 600 Vac/500 Vdc Overvoltage Trip Point 109 - 113% of adjusted line voltage C103PM (AL) DIN Rail Reset Voltage -2% of trip voltage 35 mm aluminum DIN rail available in a 36 in. Voltage Unbalance Trip Point Adjustable from 2 - 10% (91.4 cm) length. Reset on Balance (%) Selected Unbalance 2 3 4 5 6 7 8 9 10 Reset 1.5 2.5 3.5 4.5 5.4 6.3 7.2 8.1 9 Trip Delay Range Adjustable from 0.25 - 30s Severe Unbalance - 2X Selected Unbalance 0.25 - 2s disabled when the trip delay is less than 2s Random Start Delay 0.6s Phase Reversal & Phase Loss Trip Time 150ms Phase Loss Setpoint 15% unbalance Reset Type Automatic Output Type Energized when voltages are acceptable Type Electromechanical relay Form Isolated, SPDT Rating 10A resistive 240VAC 1/4 hp 125VAC 1/3 hp 250VAC max. 277VAC 6 5 Life Mechanical - 1 x 10 Electrical - 1 x 10 Protection Surge IEEE C62.41-1991 Level B Isolation Voltage 2500V RMS input to output Mechanical Mounting* Plug-in socket rated 600VAC Termination Octal 8-pin plug-in Dimensions H 77.0 mm (3.03) W 60.7 mm (2.39) D 45.2 mm (1.78) Environmental Operating/Storage Temperature -40 to 60C / -40 to 85C Weight 8.6 oz (244 g) *CAUTION: Select an octal socket rated for 600VAC operation. 2016 Littelfuse Protection Relays & Controls Rev: 1-A-062116 www.littelfuse.com/plmu11