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© 2016 Littelfuse Protection Relays & Controls www.littelfuse.com/ Rev: 1-A-062716 Protection Relays Voltage Monitoring Relays www.littelfuse.com/plr PLR SERIES
Description
The PLR Series provides a cost effective means of preventing 3-phase motor startup during adverse voltage conditions. Proper A-B-C sequence must occur in order for the PLR’s output contacts to energize. In addition, the relay will not energize when an undervoltage or phase loss condition is present. The PLR Series protects a motor against undervoltage operation. The adjustment knob sets the undervoltage trip point. Operation The output relay is energized and the LED glows when all voltages are acceptable and the phase sequence is correct. Undervoltage must be sensed for a continuous dropout 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. Field Adjustment: Turn the adjustment knob fully counterclockwise and apply three-phase power. The LED should be ON. Increase adjustment until the LED goes OFF . Decrease adjustment until LED glows again. If nuisance tripping occurs, decrease the adjustment slightly. NOTE: When properly adjusted and operating in an average system, a voltage unbalance of 10% or more is required for phase loss detection. When a phase is lost while the motor is running, a voltage will be induced into the open phase nearly equal in magnitude to the normal phase-to- phase voltage. This condition is known as regeneration. When regenerated voltages are present, the voltage unbalance during single phasing may not exceed 10% for some motors. The PLR Series may not provide protection under this condition. For systems that require superior phase loss protection, select the PLMU Series. Features & Benefits FEATURES BENEFITS Continuous monitoring Prevents 3-phase motor startup when undervoltage or phase loss condition is present Industry standard 8-pin octal plug connection Eliminates need for special connectors LED indication Quick visual indication of output status and correct phase sequence
Ordering Information
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 Relay contacts are isolated 2A fast acting fuses recommended for safety (not required). 8-PIN
© 2016 Littelfuse Protection Relays & Controls www.littelfuse.com/ Rev: 1-A-062716 Protection Relays Voltage Monitoring Relays www.littelfuse.com/plr PLR SERIES Accessories BZ1 Front Panel Mount Kit Provides an easy method of through-the-panel mounting of 8- 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 Nominal Voltage Undervoltage Dropout Adj. Range Line Voltage Max. 120VAC 85 to 130VAC 143VAC 240VAC 170 to 240VAC 270VAC 380VAC 310 to 410VAC 480VAC 480VAC 350 to 480VAC 530VAC AC Line Frequency 50/60Hz Phase Sequence ABC Response Times Pull-in ≤ 400ms Drop-out ≤ 100ms Hysterisis Pull-in/Drop-out ≅ 2% Output Type Electromechanical relay, energized when all voltages are acceptable Form SPDT Rating 5A resistive @ 240VAC, 1/4 Hp @ 120VAC Maximum Voltage 250VAC Protection Phase Reversal/Failure ASME A17.1 Rule 210.6 Motors and Generators NEMA MG1 14:30, 14:35 Surge IEEE C62.41-1991 Level B Isolation Voltage 120 & 240VAC ≥ 1500V RMS input to output 380 & 480VAC ≥ 2500V RMS input to output Mechanical Dimensions H 81.3 mm (3.2”); W 60.7 mm (2.39”); D 45.2 mm (1.78”) Mounting* Plug-in socket Termination Octal 8-pin, plug-in Environmental Operating/Storage Temperature 0° to 55°C / -40° to 85°C Weight ≅ 6 oz (170 g) *CAUTION: Select an octal socket rated for 600VAC operation.