Datasheet > PLR120A

PLR120A

更新时间： 2024-09-25 14:56:35

品牌	Logo	应用领域
力特 - LITTELFUSE		/
页数	文件大小	规格书
2页	367K
描述
工作原理 The output relay is energized and the LED glows when all voltages are acceptable and the phas

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PLR120A 数据手册

Protection Relays

Voltage Monitoring Relays

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.

8-PIN

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.

Wiring Diagram

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.

F = Fuses

ØA = Phase A = L1

ØB = Phase B = L2

ØC = Phase C = L3

NO = Normally Open

NC = Normally Closed

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.

Relay contacts are isolated

2A fast acting fuses recommended for

safety (not required).

Features & Beneﬁts

FEATURES

BENEFITS

Prevents 3-phase motor startup when undervoltage

or phase loss condition is present

Continuous monitoring

Industry standard 8-pin

octal plug connection

Eliminates need for special connectors

Quick visual indication of output status and correct

phase sequence

LED indication

Ordering Information

MODEL

LINE VOLTAGE

95 to 140VAC

190 to 270VAC

340 to 450VAC

380 to 500VAC

PLR120A

PLR240A

PLR380A

PLR480A

If you don’t ﬁnd the part you need, call us for a custom product 800-843-8848

www.littelfuse.com/plr

Rev: 1-A-062716

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