Hitachi hitachi series inverter user manual During normal operation

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.

During normal operation			When an alarm occurs or			During normal operation			When an alarm occurs
			when power is OFF			or when power is OFF
AL0	AL1	AL2	AL0	AL1	AL2	AL0	AL1	AL2	AL0	AL1	AL2
Power		Load	Power		Load	Power		Load	Power		Load
supply			supply			supply			supply

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

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