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. 8-PIN Wiring Diagram F = Fuses OA = Phase A = L1 OB = Phase B = L2 OC = Phase C = L3 NO = Normally Open NC = Normally Closed 2A fast acting fuses recommended for safety (not required). Relay contacts are isolated Ordering Information MODEL LINE VOLTAGE VOLTAGE TRIP DELAY (FIXED) UNBALANCE (FIXED) PLM6405 240VAC 4% 5 sec PLM6502 240VAC 5% 2 sec PLM6805 240VAC 8% 5 sec PLM8405 380VAC 4% 5 sec PLM9405 480VAC 4% 5 sec PLM9502 480VAC 5% 2 sec PLM9805 480VAC 8% 5 sec 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 three 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. Features & Benefits FEATURES BENEFITS 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 trip versus normal operation. Isolated, 10A, SPDT output contacts Allows control of loads for AC voltages Adjustable nominal voltage set point Allows setting for specific application voltage to optimize protection Simple 3-wire connection Allows flexibility across wide range of systems for delta or wye 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 If you don't find the part you need, call us for a custom product 800-843-8848 (c) 2016 Littelfuse Protection Relays & Controls www.littelfuse.com/plm Rev: 1-A-062116 Protection Relays Voltage Monitoring Relays PLM SERIES Accessories BZ1 Front Panel Mount Kit Provides an easy method of through-the-panel mounting of 8- pin or 11-pin plug-in timers, flashers, and other controls. OT08PC Octal 8-pin Socket 8-pin 35mm DIN rail or surface mount. Rated at 10A @ 600VAC. Surface mounted with two #6 screws or snaps onto a 35 mm DIN rail. LPSM003ZXID (Indicating), LPSM003Z (Non-indicating) Fuse Holders Littelfuse POWR-SAFE Dead Front holders provide optimum protection to personnel for Class CC and Midget-Style fuses. 600 VAC/DC 0KLK002.T Midget Fuse (2 Amp) 10 x 38 fast acting, high-interrupting capacity, current-limiting type fuse. 600 Vac/500 Vdc C103PM (AL) DIN Rail 35 mm aluminum DIN rail available in a 36 in. (91.4 cm) length. Specifications Line Voltage Type Operating Voltage 3-phase delta or wye with no connection to neutral Model 240 380 480 Adj. Line Voltage Range 200-240VAC 360-430VAC 400-480VAC AC Line Frequency Phase Sequence Power Consumption 50/100 Hz ABC 2W for 240V units 3W for 380 - 480V units Line Voltage Max 270VAC 480VAC 530VAC Low Voltage & Voltage Unbalance Type Low Voltage Trip Reset Voltage Voltage Unbalance Trip Reset on Balance Trip Delay Range Tolerance Phase Reversal & Phase Loss Response Time Phase Loss Reset Output Type Form Rating Life Protection Surge Isolation Voltage Mechanical Mounting* Dimensions Environmental Operating/Storage Temperature Weight Voltage detection with delayed trip & automatic reset 88 - 92% of adjusted line voltage Plus 3% of trip voltage Factory fixed from 4 - 8% -0.7% unbalance typical Factory fixed from 2 - 20s 15% 200ms > 35% unbalance Automatic Electromechanical relay Isolated, SPDT 10A resistive @ 240VAC, 277VAC max; 1/2 Hp @ 240VAC; 1/4 Hp @ 120VAC Mechanical - 1 x 107; Electrical - 1 x 105 IEEE C62.41-1991 Level B 2500V RMS input to output 8-pin plug-in socket rated 600VAC H 81.3 mm (3.2"); W 60.7 mm (2.39"); D 45.2 mm (1.78") -40 to 60C / -40 to 85C 4.4 oz (125 g) *CAUTION: Select an octal socket rated for 600VAC operation. (c) 2016 Littelfuse Protection Relays & Controls www.littelfuse.com/plm Rev: 1-A-062116