PLM Series Voltage Monitors
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.
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Appendix B - Dimensional Drawings
FIGURE 1
FIGURE 2
FIGURE 3
CT; ESD5; ESDR; FS100; FS200; FS300; KRD3; KRD9;
KRDB; KRDI; KRDM; KRDR; KRDS; KRPD; KRPS;
KSD1; KSD2; KSD3; KSD4; KSDB; KSDR; KSDS;
KSDU; KSPD; KSPS; KSPU; KVM; T2D; TA; TAC1;
TAC4; TDU; TDUB; TDUI; TDUS; TL; TMV8000;
TS1; TS2; TS4; TS6; TSB; TSD1; TSD2; TSD3; TSD4;
TSD6; TSD7; TSDB; TSDR; TSDS; TSS; TSU2000
HLV; HRD3; HRD9; HRDB; HRDI;
HRDM; HRDR; HRDS; HRID; HRIS;
HRIU; HRPD; HRPS; HRPU; HRV; RS
HSPZ
FIGURE 4
FIGURE 5
TRDU
FIGURE 6
TRU
FA; FS; FSU1000*; NHPD; NHPS; NHPU;
NLF1*; NLF2*; PHS*; PTHF*; SIR1; SIR2;
SLR1*; SLR2*; TH1; TH2; THC; THD1;
THD2; THD3; THD4; THD7; THDB; THDM;
THDS; THS
*If unit is rated @ 1A, see Figure 1
FIGURE 7
FIGURE 8
FIGURE 9
PLM; PLR; TDB; TDBH; TDBL; TDI; TDIH;
TDIL; TDM; TDMB; TDMH; TDML; TDR;
TDS; TDSH; TDSL
FS500; PRLB; PRLM; PRLS; TRB; TRM; TRS
(snap for
mounting
bases)
ASQU; ASTU; DSQU; DSTU
FIGURE 11
FIGURE 12
FIGURE 10
FS100; FS400
ERD3; ERDI; ERDM
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ORB; ORM; ORS
inches (millimeters)
165
Appendix C - Connection Diagrams
FIGURE 1 - FSU1000 Series
L1
FIGURE 2 - FS100 Series
L1
N/L2
S1 = Optional low current switch
V = Voltage
L = Load
FIGURE 3 - FS100 Series
L1
N
V = Voltage
L = Load
R = Red Wire
B = Black Wire
FIGURE 5 - FS300 Series
FIGURE 4 - FS200 Series
N/L2
V = Voltage
L = Load
V = Voltage
L = Load
FIGURE 6 - FS400 Series
L1
FIGURE 7 - AF Series
L1
N/L2
FIGURE 8 - FS500 Series
N/L2
L1
V = Voltage
L = Load
Note: Load may be in positive side.
FIGURE 9 - SC3/SC4 Series
L1
V = Voltage
L = Load
R = Red Wire
B = Black Wire
W= White Wire
V = Voltage
N/L2
V = Voltage
L = Load
FIGURE 11 - DLMU Series
FIGURE 10 - WVM Series
N/L2
!
SC4 shown;
for SC3, terminal 6 & load L4 are eliminated.
FIGURE 12 - HLMU Series
L1, L2, L3 = Line Voltage Input
NO = Normally Open Contact
NC = Normally Closed Contact
C = Common, Transfer Contact
CAUTION: 2 amp max. fast acting
fuses are recommended to protect
the equipment‘s wiring. They are not
required to protect the DLMU.
! = Select alarm contact connection as N.O. or
N.C. when ordering; N.O. Shown.
F = Fuses
NO = Normally Open
NC = Normally Closed
RS = Optional Remote Reset Switch
Relay contacts are isolated.
CAUTION:
2 amp max fast acting fuses must
be installed externally in series
with each input. (3)
FIGURE 14 TVM/TVW Series
FIGURE 13 PLMU/PLM/PLR/PLS Series
Note: Relay contacts are
isolated, 277VAC max.
L1, L2, L3 = Line Voltage Input
NO = Normally Open Contact
NC = Normally Closed Contact
C = Common, Transfer Contact
CAUTION: 2 amp max. fast acting fuses are
recommended to protect the equipment‘s
wiring. They are not required to protect the
HLMU.
168
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.
L1 = Phase A
L2 = Phase B
L3 = Phase C
NO = Normally Open
NC = Normally Closed
C = Common, Transfer Contact
Relay contacts are isolated.
F = 2A Fast acting fuses are recommended,
but not required
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