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ANSI Device #27/47/59
Protects Against: Phase
Loss, Phase Reversal,
Over, Under & Unbalanced
Voltages, Over/Under
Frequency
Encapsulated Circuitry
DPDT Isolated 10 A Contacts
LED Indicates Relay Status,
Faults, & Time Delays
Universal Line Voltage
200 ... 480 V AC in One Unit
Compact, Encapsulated
Design
Finger-Safe Terminal
Blocks, up to 12 AWG
ASME A17.1 rule 210.6
NEMA MG1 14:30, 14:35
IEEE C62.41-1991 Level B
Approvals:
Accessories
3-phase fuse
block/disconnect
P/N: P0700-241
2 Amp Fuse
P/N: P0600-11
DIN rail P/Ns:
017322005 (Steel)
C103PM (Al)
DIN rail adaptor
P/N: P1023-20
See accessory pages for
specifications.
Ordering Table
HLMU
X
X
Series
Output
Restart Function
–D
- DPDT
–L
- Lockout, Min Off Time
–R
- Staggered Restarting
–N
- No Restart Delay
Example P/N:
HLMUDLAAA
= 200 ... 480 V, DPDT, Lockout Restart, Adjustable Unbalance, Trip and Restart Delay
HLMUDNAAN
= 200 ... 480 V, DPDT, No Restart Delay, Adjustable Unbalance and Trip Delay
HLMUDRAAA
= 200 ... 480 V, DPDT, Staggered Restart, Adjustable Unbalance, Trip and Restart Delay
HLMUDL0405A
= 200 ... 480, DPDT, Lockout Restart, Fixed Unbalance 4%, Fixed Trip Delay 5 Seconds, Adjustable Restart
7.8
1TRC 001 009 C0202
Universal 3 Phase Voltage Monitor
HLMU Series (DPDT)
Motor Protector
Description
The HLMU Series is a universal voltage, encapsulated, 3 Phase Voltage Monitor. It continuously measures the
voltage of each of the three phases with microcontroller accuracy and compares the value to preset trip points.
It separately senses Phase Reversal, Over, Under and Unbalanced voltages including Phase Loss and over or
under frequency. Protection is assured during periods of large average voltage fluctuations, or when regener-
ated voltages are present. The unit trips within 200 ms when phase loss is detected. Adjustable time delays are
included to prevent nuisance tripping and short cycling of sensitive equipment. The 10A isolated DPDT output
relay contacts trip when a phase voltage exceeds the trip limits for the trip delay. Nominal line voltage, voltage
unbalance, and time delays are knob adjustable. The phase loss set point and the acceptable frequency range
are fixed.
Both Delta and Wye systems can be monitored; no connection to neutral is required.
Operation
Upon application of line voltage, the output is de-
energized and the restart delay begins. If all the three
phase voltages are within the acceptable range, the
output energizes at the end of the restart delay. The
microcontroller circuitry automatically senses the volt-
age range, and selects the correct operating frequency
(50 or 60hz). The over and under voltage trip points
are set at +/- 10% of the adjusted line voltage. When
the measured value of any phase voltage exceeds the
acceptable range limits (lower or upper) the trip delay
begins. At the end of the trip delay the output relay
de-energizes. If the phase voltage returns to an accept-
able value before the trip delay expires, the trip delay
is reset and the output remains energized. Under, over,
and unbalanced voltages plus over or under frequency
must be sensed for the complete trip delay before the
unit trips. The unit trips in 200 ms when phase loss or
reversal are sensed. The unit will not energize if a fault
is sensed as the line voltage is applied.
Reset: Reset is automatic upon correction of the volt-
age or frequency fault or phase sequence.
Connection
L1, L2, L3 = Line Voltage Input
NO = Normally Open Contact NC = Normally Closed Contact
C = Common, Transfer Contact
Note: Relay contacts are isolated, 277 V AC max.
X
Voltage Unbalance
–A
- Adjustable 2 ...10%
Fixed: Specify Unbalance
2 ...10% in 1% increments,
using 2 digits [04]
Restart Delay Options:
L= Lockout or minimum OFF time. The restart
delay begins when the output trips. The unit cannot
be re-energized until the restart delay is complete.
This provides a minimum off time or lockout time to
allow equipment sensitive to short cycling, time to
reset. If the fault is corrected after the restart delay
is complete, the output energizes immediately.
The restart delay also occurs when line voltage is
applied/reapplied.
R= Restart Delay on fault correction. The restart
delay begins when line voltage is reapplied or
when a voltage fault is corrected. This option is
normally selected when staggered restarting of
multiple motors on a power system is required.
N= No Restart Delay. 0.6 second initialization
delay on application of line voltage applies.
Restart Notes:
All restart options remain reset when the following
conditions are detected:
1.) Phase Loss (phase unbalance greater
than 25%)
2.) Average Line Voltage less than 120VAC
3.) Phase Reversal
The restart delay begins when the condition is
corrected.
LED Operation
The LED flashes green during the restart delay, then
CAUTION: 2
glows green when the output energizes. It flashes red
amp max. fast
during the trip delay then glows red when the output
acting fuses are
de-energizes. It flashes red/green if phase reversal is
recommended
sensed. If a fault is sensed during the restart delay,
to protect the
the LED will glow red during that portion or the full
equipment's wir-
restart delay.
ing. They are not
required to pro-
LED Flashing Table
tect the HLMU.
Trip Delay
Restart Delay
Phase Reversal
X
Trip Delay
–A
- Adjustable 1...30 s
Fixed: Specify delay
1 ... 30 s in 1 s
increments, using
2 digits, [05]
ABB Inc. • 888-385-1221 • Technical assistance 800-377-7722 • www.ssac.com
120 FPM
Red
ON/OFF
60 FPM
Green
ON/OFF
120 FPM
Red/Green
Alternate
FPM = Flashes per minute
X
Restart Delay
–A
- Adjustable 0.6 ...300 s 1
–N
- No Restart Delay
1 Selection "A" is only available for
Restart functions "L" and "R"
Low Voltage Products & Systems
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