User manual | PLMU Series Voltage Monitors Features:

Voltage Monitors
PLMU Series
The PLMU Series continuously measures the
voltage of each of the three phases to provide
protection for 3-phase motors and sensitive loads.
Its microcontroller senses under and overvoltage,
voltage unbalance, phase loss, and phase reversal.
Protection is provided even when regenerated
voltages are present. Universal voltage operation
and standard base connection allows the PLMU
to replace hundreds of competitive part numbers.
For more information see:
Appendix B, page 166, Figure 18 for dimensional drawing.
Appendix C, page 168, Figure 13 for connection diagram.
Operation
Upon application of power, a 0.6s random start delay begins and the PLMU measures the voltage levels and line
frequency and selects the voltage range. The output relay is energized and the LED glows green when all voltages
are acceptable and the phase sequence is correct. LED flashes green during trip delay, glows red when output
de-energizes. Undervoltage, overvoltage, and voltage unbalance must be sensed for continuous trip delay before
the relay de-energizes. Re-energization is automatic upon fault correction. The output relay will not energize
if a fault condition is sensed as 3-phase input voltage is applied. The LED alternately flashes red/green when
phase reversal is sensed. Line voltage is selected with the knob, setting the over and under voltage trip points.
Voltage range is automatically selected by the microcontroller.
Features:
• Protects against phase & reversal; & over,
under & unbalanced voltages
• Octal plug-in
• Isolated, 10A, SPDT output contacts
• Operates from 200 to 480VAC
• LED indicator glows green when voltages are
acceptable, red for faults
• Indicates reverse-phase wiring
• Simple 3-wire connection for delta or wye
systems
• ASME A17.1 Rule 210.6
• NEMA MG1 14:30, 14:35
• IEEE C62.41-1991 Level B
Approvals:
Auxilary Products:
• Panel mount kit: P/N: BZ1
• 8-pin octal 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:
PLMU11
LED Indicator
Order Table:
Voltage Unbalance
Adjustable 2-10%
Trip Delay
Adjustable 0.25-30s
Part Number
PLMU11
Steady Green
Energized
Steady Red
De-engergized
(tripped on fault)
Flashing Green
Trip Delay
Alternate Flashing
Red/Green
Phase Reversal
Specifications
Line Voltage
Type . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-phase delta or wye with no connection to
neutral
Line Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . 200 to 480VAC ±15%, 50/60 Hz ±2 Hz
Adjustable Voltage Ranges
(Automatic Range Selection) . . . . . . . . . . . . 200 to 240VAC, 50/60 Hz
340 to 420VAC, 50 Hz
400 to 480VAC, 60 Hz
Maximum Voltage . . . . . . . . . . . . . . . . . . . . . . 552VAC
Phase Sequence . . . . . . . . . . . . . . . . . . . . . . . . . ABC
Overvoltage, Undervoltage, & Voltage Unbalance
Type . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Voltage detection with delayed trip & automatic
reset
Overvoltage & Undervoltage
Undervoltage Trip Point . . . . . . . . . . . . . . . 88 - 92% of adjusted line voltage
Reset Voltage . . . . . . . . . . . . . . . . . . . . . . . . . +2% of trip voltage
Overvoltage Trip Point . . . . . . . . . . . . . . . . 109 - 113% of adjusted line voltage
Reset Voltage . . . . . . . . . . . . . . . . . . . . . . . . . -2% of trip voltage
Voltage Unbalance Trip Point . . . . . . . . . . . . . Adjustable from 2 - 10%
Factory fixed from 4 - 10% (a minimum order
quantity applies)
Reset on Balance (%):
Selected Unbalance
2
3
4
5
6
7
8
9
10
Reset
1.5 2.5 3.5 4.5 5.4 6.3 7.2 8.1
9
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Trip Delay Range . . . . . . . . . . . . . . . . . . . . . . . . Adjustable from 0.25 - 30s
Factory fixed from 2 - 30s ±15%
(a minimum order quantity applies)
Severe Unbalance - 2X Selected Unbalance . 0.25 - 2s; disabled when the trip delay is less
than 2s
Random Start Delay . . . . . . . . . . . . . . . . . . . . . ≅ 0.6s
Phase Reversal & Phase Loss Trip Time . . . . ≤ 150ms
Phase Loss Setpoint . . . . . . . . . . . . . . . . . . . . . . ≥ 15% unbalance
Reset Type . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Automatic
Output Type . . . . . . . . . . . . . . . . . . . . . . . . . . . . Energized when voltages are acceptable
Rating . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10A resistive @ 240VAC; 1/4 hp @ 125VAC;
1/3 hp @ 250VAC; max. 277VAC
Life . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Mechanical - 1 x 106 ; Electrical - 1 x 105
Protection
Surge . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . IEEE C62.41-1991 Level B
Isolation Voltage . . . . . . . . . . . . . . . . . . . . . . . . ≥ 2500V RMS input to output
Mechanical
Mounting* . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Plug-in socket rated 600VAC
Termination . . . . . . . . . . . . . . . . . . . . . . . . . . . . Octal 8-pin plug-in
Dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3.03 x 2.39 x 1.78 in. (77.0 x 60.7 x 45.2 mm)
Environmental
Operating / Storage Temperature . . . . . . . . . -40° to 60°C / -40° to 85°C
Weight . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ≅ 8.6 oz (244 g)
*CAUTION: Select an octal socket rated for 600VAC operation.
113
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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