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HLMU Datasheet(PDF) 1 Page - Littelfuse

No. de Pieza. HLMU
Descripción  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
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Fabricante  LITTELFUSE [Littelfuse]
Página de inicio  http://www.littelfuse.com
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HLMU Datasheet(HTML) 1 Page - Littelfuse

   
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© 2016 Littelfuse Protection Relays & Controls
www.littelfuse.com/
Rev: 1-A-062716
Protection Relays
Voltage Monitoring Relays
www.littelfuse.com/hlmu
HLMU SERIES
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 and loss; over, under and unbalanced voltages; and
over or under frequency. Protection is assured during periods
of large average voltage fluctuations, or when regenerated
voltages are present. The unit trips within 200ms when phase
loss is detected. Adjustable time delays are included to prevent
nuisance tripping and short cycling of sensitive equipment. The
isolated, 10A, DPDT 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 setpoint and the acceptable frequency range are
fixed. Both delta and wye systems can be monitored; no
connection to neutral is required.
Features & Benefits
FEATURES
BENEFITS
Proprietary
microcontroller based
circuitry
Constant monitoring to protect against phase loss,
phase reversal; over, under, and unbalanced voltage;
over and under frequency
Universal line
voltage range
Flexibility to work in 200 to 480VAC applications
DIN rail (35mm) or
surface mounting
Installation flexibility
LED indication
Provides diagnostics of relay, fault and time
delay status
Encapsulated
Protects against shock, vibration, and humidity
Finger-safe
terminal blocks
Meets IEC 61000 safety requirements
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 voltage 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 acceptable 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 200ms 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 voltage or
frequency fault or phase sequence.
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,
Ordering Information
MODEL
OUTPUT RESTART
FUNCTION
VOLTAGE
UNBALANCE
TRIP
DELAY
RESTART
DELAY
HLMUDLAAA
DPDT
Lockout,
min off
time
Adjust.
2 - 10%
Adjust.
1 - 30s
Adjust.
0.6 - 300s
HLMUDN0405N DPDT
No restart
delay
Fixed, 4%
Fixed, 5s None
HLMUDNAAN
DPDT
No restart
delay
Adjust.
2 - 10%
Adjust.
1 - 30s
None
HLMUDRAAA
DPDT
Staggered
restart
Adjust.
2 - 10%
Adjust.
1 - 30s
Adjust.
0.6 - 300s
If you don’t find the part you need, call us for a custom product 800-843-8848
Wiring Diagram
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.
NOTE: Relay contacts are isolated,
277VAC max.


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