Protection Relays
Voltage Monitoring Relays
WVM SERIES
Description
The WVM Series provides protection against premature
equipment (motor) failure caused by voltage faults on the
3-phase line. The WVM’s microcontroller design provides reliable
protection even if regenerated voltages are present. It combines
dependable fault sensing with a 10 fault memory and a 6 LED
status display. Part instrument, part control, the WVM protects
your equipment when you’re not there and displays what
happened when you return. The WVM is fully adjustable and
includes time delays to prevent nuisance tripping and improve
system operation. Time delays include a 0.25 to 30s adjustable
trip delay, an adjustable 0.25 to 64m (in 3 ranges) restart delay,
plus a unique 3 to 15s true random start delay. The random start
delay prevents voltage sags caused by simultaneous restarting
of numerous motor loads after a power outage.
OBSOLETE
Wiring Diagram
Features & Benefits
FEATURES
Proprietary
microcontroller
based circuitry
Fault memory
LED indication
Switch selectable
automatic restart,
delayed automatic
restart, and manual reset
Random start delay
BENEFITS
Constant monitoring to protect against phase loss,
phase reversal, over voltage, under voltage,
unbalance, and short cycling
Stores the 10 most recent faults, which provides
diagnostics for troubleshooting
Provides visual indictation of existing relay/fault
status or faults stored in memory.
Allows user adjustment to handle unique
application requirements
Prevents voltage sags caused by simultaneous
restarting of multiple motor loads after a
power outage
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)
Ordering Information
MODEL
LINE VOLTAGE
UNBALANCE
TRIP DELAY
Operation
The output relay is energized when all conditions are acceptable
and the WVM is reset. A restart and/or random start delay may
occur before the output relay is energized.
Field Adjustment:
Select the line voltage listed on the motor’s
name plate. This automatically sets the over and undervoltage
trip points. No further adjustment should be required to achieve
maximum equipment protection.
SWITCH SELECTABLE RESET METHOD
RESTART DELAY
WVM011AL
WVM611AH
WVM611AL
WVM611RL
WVM811AH
WVM811RL
WVM911AH
WVM911AL
WVM911AL-60
WVM911AN
WVM911RH
WVM911RL
WVM911RN-60
500 to 600VAC
200 to 240VAC
200 to 240VAC
200 to 240VAC
355 to 425VAC
355 to 425VAC
400 to 480VAC
400 to 480VAC
400 to 480VAC
400 to 480VAC
400 to 480VAC
400 to 480VAC
400 to 480VAC
2 - 10%
2 - 10%
2 - 10%
2 - 10%
2 - 10%
2 - 10%
2 - 10%
2 - 10%
2 - 10%
2 - 10%
2 - 10%
2 - 10%
2 - 10%
0.25 - 30s
0.25 - 30s
0.25 - 30s
0.25 - 30s
0.25 - 30s
0.25 - 30s
0.25 - 30s
0.25 - 30s
0.25 - 30s
0.25 - 30s
0.25 - 30s
0.25 - 30s
0.25 - 30s
Auto restart upon fault trip
Auto restart upon fault trip
Auto restart upon fault trip
Auto restart upon fault correction
Auto restart upon fault trip
Auto restart upon fault correction
Auto restart upon fault trip
Auto restart upon fault trip
Auto restart upon fault trip
Auto restart upon fault trip
Auto restart upon fault correction
Auto restart upon fault correction
Auto restart upon fault correction
0.25 - 64s
0.25 - 64m
0.25 - 64s
0.25 - 64s
0.25 - 64m
0.25 - 64s
0.25 - 64m
0.25 - 64s
0.25 - 64s, no random start delay
6 - 300s
0.25 - 64m
0.25 - 64s
6 - 300s, no random start delay
If you don’t find the part you need, call us for a custom product 800-843-8848
© 2016 Littelfuse Protection Relays & Controls
www.littelfuse.com/wvm
www.littelfuse.com/
Rev: 1-A-062716
Protection Relays
Voltage Monitoring Relays
WVM SERIES
Read Memory:
Fault(s) stored in the memory are indicated
when the yellow LED is flashing, up to 10 faults are noted.
Memory Reset:
To clear the memory of all faults
stored, rotate selector to Clear Memory for 5 seconds.
The yellow LED will turn off.
Memory Overload:
Only the 10 most recent faults
are retained.
Random Start Delay:
A new 3 to 15s random start delay is
selected by the microcontroller when a fault is corrected and
when the operating voltage (L1, L2, L3) is applied to the WVM.
A random start delay does not occur when the reset is manual.
Automatic Restart:
Upon fault correction, the output will
re-energize after a random start delay.
Automatic Restart Upon Fault Trip:
When a fault is sensed for
the full trip delay, the output de- energizes and a restart delay
is initiated. This delay locks out the output for the delay period.
Should the fault be corrected by the end of the restart delay, the
output will re-energize after a random start delay. A restart delay
will also occur when operating voltage (L1, L2, L3) is applied to
the WVM.
Manual Reset:
After a fault condition is corrected, the WVM can
be manually reset. There are two methods; a customer supplied
remote switch, or the onboard selector switch.
Manual Reset (Onboard):
Rotate selector switch from the
Manual Reset position to Auto Restart w/ Delay then back
again to Manual Reset within 3 seconds. The output will
immediately energize.
Remote Reset:
Reset (Restart) is accomplished by a momentary
contact closure across terminals 1 & 2. The output will
immediately energize. Remote switch requirements are ≥10mA
@ 20VDC and the reset terminals are not isolated from line
voltage. A resistance of ≤20KΩ across terminals 1 & 2 will cause
immediate automatic restart.
Automatic Restart Upon Fault Correction:
(P/N includes an R)
When a fault is sensed for the full trip delay, the output relay
de-energizes. Upon correction of the fault, a restart delay
begins. At the end of this delay, the output will re-energize after
a random start delay. If a fault occurs during restart timing, the
restart time delay will be reset to zero, and the output will not
energize until the restart delay is completed.
AC Line Frequency
Overvoltage, Undervoltage,
& Voltage Unbalance
Overvoltage Trip Point
Reset Voltage
Undervoltage Trip Point
Reset Voltage
Voltage Unbalance
Trip Delay
Phase Loss
Response Time
Random Start Delay Range
Reset (Restart) Delay
Low Range
Normal Range
High Range
Fault Memory
Type
Capacity
Status Indicators
Specifications
Line Voltage
Type
Operating Voltage
3-phase delta or wye with no connection
to neutral
Model
Adj. Line Voltage Range
240
200-240VAC
380
355-425VAC
480
400-480VAC
600
500-600VAC
50/60 Hz
109-113% of adjusted voltage
-2% of trip point
88-92% of adjusted voltage
+2% of trip point
Adjustable from 2-10%*
Adjustable from 0.25 - 30s ±15%
≥ 15% unbalance
≤ 200 ms
3 - 15s
0.25-64s ±15%
6-300s ±15%
0.25-64m ±15%
Nonvolatile RAM
Stores last 10 faults
6 LEDs provide existing status &
memory readout
Note: 50% of operating line voltage must
be applied to L1 & L2 for operation of
status indicators
Electromechanical relay
Isolated, SPDT
10A resistive @ 250VAC; 6A inductive
(0.4 PF) @ 250VAC
Mechanical - 1 x 10
7
ASME A17.1 Rule 210.6
NEMA MG1 14:30, 14:35
IEEE 62.41-1991 Level B
≥ 2500V RMS input to output
Surface with 2 or 4 #8 (M4 x 0.7) screws
H
175.3 mm (6.9”);
W
111.8 mm (4.4”);
D
61.0 mm (2.4”)
Screw terminals with captive wire clamps for
up to #12 AWG ( 3.2 mm
2
) wire
Output
Type
Form
Rating
Life
Protection
Phase Reversal/Failure
Motors and Generators
Surge
Isolation Voltage
Mechanical
Mounting
Dimensions
Termination
Environmental
Operating/Storage
Temperature
Weight
Accessories
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.
-40° to 65°C / -40° to 85°C
≅
25 oz ( 709 g)
* Unbalance reset is 90% of the unbalance setting (i.e. VUB at 5% reset is 4.5%)
© 2016 Littelfuse Protection Relays & Controls
www.littelfuse.com/wvm
www.littelfuse.com/
Rev: 1-A-062716
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