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US Pat #6541954
ANSI Device # 47/27
Protects Against: Phase
Loss, Phase Reversal,
Undervoltage, &
Unbalanced Voltages
8 Pin Plug-in Base
Adjustable Low Voltage
Trip Point
Factory Fixed Unbalance
and Trip Delay
Line Voltages 200...480 V AC,
in 3 Ranges
SPDT Isolated 10 A Relay
Contacts
ASME A17.1 rule 210.6
NEMA MG1 14:30, 14:35
IEEE C62.41-1991 Level B
Approvals:
Accessories
Panel mount kit
P/N: BZ1
Octal
8 pin socket
P/N: OT08PC
3-phase fuse
block/disconnect
P/N: P0700-241
2 AMP fuse
P/N: P0600-11
DIN rail P/Ns:
C103PM (Al)
017322005 (Steel)
See accessory pages for
specifications.
7.12
1TRC 001 009 C0202
3 Phase Voltage Monitor
PLM Series
Motor Protector
Description
The PLM Series continuously measures the voltage of each of the three phases. The PLM Series uses a new
microcontroller circuit design that senses Undervoltage, Voltage Unbalance, Phase Loss, and Phase Reversal.
Protection is assured when regenerated voltages are present. Both Delta and Wye systems can be monitored;
no connection to neutral is required.
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.
Connection
Relay contacts are isolated.
Dashed lines are internal connections.
F = Fuses
NO = Normally Open
NC = Normally Closed
Ordering Table
X
PLM
Series
Line Voltage
–6
- 240 V AC
–8
- 380 V AC
–9
- 480 V AC
Example P/N:
PLM6405, PLM9410
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 3
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.
2 Amp
Fast Acting
Fuses
are
Recommended
For Safety
(Not Required)
X
Voltage Unbalance (Fixed)
–Specify: 4, 5, 6, 7, or 8%
ABB Inc. • 888-385-1221 • Technical assistance 800-377-7722 • www.ssac.com
X
Trip Delay (Fixed)
–Specify from
2
...
20
s in
1 s increments
(Insert
0
before
1
... 9)
Low Voltage Products & Systems
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