Hitachi L200 Manuale Utente

L200 Inverter

Oper

ations

and Monitor

ing

The alarm relay output can be configured in two main ways: 

• Trip/Power Loss Alarm – The alarm relay is configured as normally closed 

(C036=1) 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=0), 

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 when power is OFF

During normal operation 

or when power is OFF

When an alarm occurs

AL0

AL2

AL1

Power

supply

Alarm

device

AL0

AL2

AL1

Power

supply

Alarm

device

AL0

AL2

AL1

Power

supply

Alarm

device

AL0

AL2

AL1

Power

supply

Alarm

device

ON

Normal

Closed

Open

ON

Trip

Open

Closed

OFF

—

Open

Closed

ON

Normal

Open

Closed

ON

Trip

Closed

Open

OFF

—

Open

Closed