User manual | PLM Series Voltage Monitors Features:

Voltage Monitors
PLM Series
The PLM Series continuously measures the voltage
of each of the three phases. The PLM Series
uses a 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 .
For more information see:
Appendix B, page 165, Figure 8 for dimensional drawing.
Appendix C, page 168, Figure 13 for connection diagram.
Features:
• Protects against phase loss & reversal; &
under & unbalanced voltages
• 8-pin plug-in base
• Adjustable low voltage trip point
• Factory fixed unbalance & trip delay
• Line voltages 200 to 480VAC in 3 ranges
• Isolated, 10A, SPDT output contacts
• ASME A17.1 rule 210.6
• NEMA MG1 14:30, 14:35
• IEEE C62.41-1991 Level B
Approvals:
Auxiliary Products:
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 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.
• Panel mount kit: P/N: BZ1
• Octal 8-pin socket: P/N: OT08PC
• 3-phase fuse block/disconnect:
P/N: FH3P
• 2 Amp fuse: P/N: P0600-11
• DIN rail: P/N: C103PM (Al)
Available Models:
PLM6405
PLM6502
PLM6805
PLM8405
PLM8805
PLM9405
PLM9502
PLM9805
PLM9820
If desired part number is not listed, please call us to
see if it is technically possible to build .
Order Table:
PLM
X
Line Voltage
─6 - 240VAC
─8 - 380VAC
─9 - 480VAC
Specifications
X
Voltage Unbalanced
─Fixed - Specify - 4-8%
in 1% increments
X
Trip Delay
─Fixed - Specify from 2-20s
in 1s increments using
two digits
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 Voltage . . . . . . 88 - 92% of adjusted line voltage
Reset Voltage . . . . . Plus 3% of trip voltage
Voltage Unbalance
Trip Unbalance . . . 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:
Phase Reversal . . . . . . ≤ 200ms
Phase Loss . . . . . . . . . . ≤ 200ms
114
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
5
7
Life . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Mechanical - 1 x 10 ; Electrical - 1 x 10
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 . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3.2 x 2.39 x 1.78 in. (81.3 x 60.7 x 45.2 mm)
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.
www.ssac.com • 800-843-8848 • fax: 605-348-5685
Courtesy of Steven Engineering, Inc.-230 Ryan Way, South San Francisco, CA 94080-6370-Main Office: (650) 588-9200-Outside Local Area: (800) 258-9200-www.stevenengineering.com

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