Protection Relays Voltage Monitoring Relays PLM SERIES Voltage Monitor Description 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 8-PIN 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 Wiring Diagram phase reversal is sensed. Field Adjustment Set voltage adjustment knob at the desired operating line F = Fuses voltage for the equipment. This adjustment automatically sets A = Phase A = L1 the undervoltage trip point. Apply power. If the PLM fails to B = Phase B = L2 energize, (LED glows red) check wiring of all three phases, C = Phase C = L3 voltage, and phase sequence. If phase sequence is incorrect, NO = Normally Open the LED flashes green/red. To correct this, swap any two NC = Normally Closed line voltage connections at the mounting socket. No further adjustment should be required. 2A fast acting fuses recommended for safety (not required). Features & Benefits FEATURES BENEFITS Relay contacts are isolated 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 trip versus LED diagnostics normal operation. Isolated, 10A, SPDT Ordering Information Allows control of loads for AC voltages output contacts VOLTAGE Allows setting for specific application Adjustable nominal MODEL LINE VOLTAGE TRIP DELAY (FIXED) UNBALANCE (FIXED) voltage set point voltage to optimize protection PLM6405 240VAC 4% 5 sec Simple 3-wire connection Allows flexibility across wide range of systems for delta or wye systems PLM6502 240VAC 5% 2 sec Complies with safety codes for elevators, ASME A17.1 Rule 210.6 escalators, moving walkways PLM6805 240VAC 8% 5 sec Complies with safety codes for motors NEMA MG1 14:30, 14:35 and generators PLM8405 380VAC 4% 5 sec Complies with safety codes for surge and IEEE C62.41-1991 Level B PLM9405 480VAC 4% 5 sec voltage protection PLM9502 480VAC 5% 2 sec PLM9805 480VAC 8% 5 sec If you dont find the part you need, call us for a custom product 800-843-8848 2016 Littelfuse Protection Relays & Controls Rev: 1-A-062116 www.littelfuse.com/plmProtection Relays Voltage Monitoring Relays PLM SERIES 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, Operating Voltage ashers, and other controls.fl Adj. Line Model Line Voltage Max Voltage Range OT08PC Octal 8-pin Socket 240 200-240VAC 270VAC 8-pin 35mm DIN rail or surface mount. Rated at 380 360-430VAC 480VAC 10A 600VAC. Surface mounted with two 6 480 400-480VAC 530VAC screws or snaps onto a 35 mm DIN rail. LPSM003ZXID (Indicating), AC Line Frequency 50/100 Hz LPSM003Z (Non-indicating) Fuse Holders Phase Sequence ABC Littelfuse POWR-SAFE Dead Front holders Power Consumption 2W for 240V units provide optimum protection to personnel for 3W for 380 - 480V units Class CC and Midget-Style fuses. 600 VAC/DC Low Voltage & 0KLK002.T Midget Fuse (2 Amp) Voltage Unbalance 10 x 38 fast acting, high-interrupting capacity, Type Voltage detection with delayed current-limiting type fuse. 600 Vac/500 Vdc trip & automatic reset C103PM (AL) DIN Rail Low Voltage 35 mm aluminum DIN rail available in a 36 in. Trip 88 - 92% of adjusted line voltage (91.4 cm) length. Reset Voltage Plus 3% of trip voltage Voltage Unbalance Trip Factory fixed from 4 - 8% Reset on Balance -0.7% unbalance typical Trip Delay Range Factory fixed from 2 - 20s Tolerance 15% Phase Reversal & Phase Loss Response Time 200ms Phase Loss > 35% unbalance Reset Automatic Output Type Electromechanical relay Form Isolated, SPDT Rating 10A resistive 240VAC, 277VAC max 1/2 Hp 240VAC 1/4 Hp 120VAC 7 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* 8-pin plug-in socket rated 600VAC Dimensions H 81.3 mm (3.2) W 60.7 mm (2.39) D 45.2 mm (1.78) Environmental Operating/Storage Temperature -40 to 60C / -40 to 85C Weight 4.4 oz (125 g) *CAUTION: Select an octal socket rated for 600VAC operation. 2016 Littelfuse Protection Relays & Controls Rev: 1-A-062116 www.littelfuse.com/plm