Hitachi SJ300 Series Instruction Manual page 187

The alarm output terminals operate as shown below (left) by default. The contact logic can be
inverted as shown (below right) by using the parameter setting C036. The relay contacts
normally open (N.O.) and normally closed (N.O.) convention uses "normal" to mean the
inverter has power and is in Run or Stop Mode. The relay contacts switch to the opposite
position when it is in Trip Mode or when input power is OFF.
Contact position after initialization
During normal running When an alarm occurs or
power is turned OFF
AL1
AL0 AL2
Run
Contact Power
State
N.C. ON Normal
(after
ON Trip
initialize,
C036=01)
OFF –
Contact position inverted by C036 setting
During normal running or
power is turned OFF
AL1
AL0 AL2 AL0 AL2
AL0- AL0-
Contact
AL1 AL2
Closed Open N.O.
(set
Open Closed
C036=00)
Open Closed
SJ300 Inverter
When an alarm occurs
AL1 AL1
AL0 AL2
Run AL0-
Power
State AL1
ON Normal Open
ON Trip Closed
OFF – Open
4–49
AL0-
AL2
Closed
Open
Closed