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© 2016 Littelfuse Protection Relays & Controls Protection Relays Voltage Monitoring Relays www.littelfuse.com/plm Rev: 1-A-062116 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 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 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
Ordering Information
MODEL LINE VOLTAGE VOLTAGE UNBALANCE (FIXED) TRIP DELAY (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 If you don’t find the part you need, call us for a custom product 800-843-8848 Wiring Diagram F = Fuses ØA = Phase A = L1 ØB = Phase B = L2 ØC = Phase C = L3 NO = Normally Open NC = Normally Closed 2A fast acting fuses recommended for safety (not required). Relay contacts are isolated 8-PIN
© 2016 Littelfuse Protection Relays & Controls Protection Relays Voltage Monitoring Relays www.littelfuse.com/plm Rev: 1-A-062116 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 3-phase delta or wye with no connection to neutral Operating Voltage Model Adj. Line Voltage Range Line Voltage Max 240 200-240VAC 270VAC 380 360-430VAC 480VAC 480 400-480VAC 530VAC AC Line Frequency 50/100 Hz Phase Sequence ABC Power Consumption ≅ 2W for 240V units ≅ 3W for 380 - 480V units Low Voltage & Voltage Unbalance Type Voltage detection with delayed trip & automatic reset Low Voltage Trip 88 - 92% of adjusted line voltage 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 Life Mechanical - 1 x 107; Electrical - 1 x 10 5 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 60°C / -40° to 85°C Weight ≅ 4.4 oz (125 g) *CAUTION: Select an octal socket rated for 600VAC operation.