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The alarm relay output can be configured in two main ways:
• 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.
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.
N.C. contacts (C036=01) N.O. contacts (C036=00)
During normal operation When an alarm occurs or
when power is OFF
During normal operation
or when power is OFF
When an alarm occurs
Power Run Mode AL0-AL1 AL0-AL2 Power Run Mode AL0-AL1 AL0-AL2
ON Normal Closed Open ON Normal Open Closed
ON Trip Open Closed ON Trip Closed Open
OFF – Open Closed OFF – Open Closed
AL1
Power
supply
Load
AL0 AL2
AL1
Power
supply
Load
AL0 AL2
AL1
Power
supply
Load
AL0 AL2
AL1
Power
supply
Load
AL0 AL2