Hitachi WJ200 Series Quick Reference Manual page 42

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The alarm relay output can be configured in two main ways:
•
•
Be sure to use the relay configuration that is appropriate for your system design. Note that
the external circuits shown assume that a closed circuit = no alarm condition (so that a
broken wire also causes an alarm). However, some systems may require a closed circuit =
alarm condition. In that case, then use the opposite terminal [AL1] or [AL2] from the ones
shown.
During normal operation
AL0 AL1
Power
supply
Power
ON
ON
OFF
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Trip/Power Loss Alarm – The alarm relay is configured as normally closed (C036=01)
by default, shown below (left). An external alarm circuit that detects broken wiring also
as an alarm connects to [AL0] and [AL1]. After powerup and short delay (< 2 seconds),
the relay energizes and the alarm circuit is OFF. Then, either an inverter trip event or
an inverter power loss will de-energize the relay and open the alarm circuit
Trip Alarm – Alternatively, you can configure the relay as normally open (C036=00),
shown below (right). An external alarm circuit that detects broken wiring also as an
alarm connects to [AL0] and [AL2]. After powerup, the relay energizes only when an
inverter trip event occurs, opening the alarm circuit. However, in this configuration, an
inverter power loss does not open the alarm circuit.
N.C. contacts (C036=01)
When an alarm occurs or
when power is OFF
AL2 AL0 AL1
Power
Load
supply
Run Mode AL0-AL1 AL0-AL2
Normal Closed
Trip Open
– Open
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During normal operation
or when power is OFF
AL2 AL0 AL1
Power
Load
supply
Power Run Mode
Open ON
Closed ON
Closed OFF
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N.O. contacts (C036=00)
When an alarm occurs
AL2
AL0 AL1
Power
Load Load
supply
AL0-AL1 AL0-AL2
Normal Open Closed
Trip Closed
– Open Closed
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AL2
Open