PLM Series Datasheet by Littelfuse Inc.

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% Liltelfuse“ mmmwm \ wnmd CENGE L1 L2 L3
© 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 lmalfuse Pmtactm
© 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 105
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.

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