Hitachi L100 Series Instruction Manual page 139

4–28
Using Intelligent Output Terminals
The alarm output terminals are connected as shown below (left) by default. The contact
logic can be inverted as shown (below right) by using the parameter setting C_33. 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.
N.C. contacts (after initialization)
During normal running
AL0 AL1 AL2
Contact Power
N.C. ON
(after
ON
initialize,
C_33=01)
OFF
When an alarm occurs
or power is turned OFF
AL0 AL1 AL2
Run AL0- AL0-
State AL1 AL2
Normal Closed Open
Trip Open Closed
— Open Closed
N.O. contact (inverted by C_33 setting)
During normal running
or power is turned OFF
AL0 AL1 AL2
Run
Contact Power
State
N.O. ON Normal
(set
ON Trip
C_33=00)
OFF —
When an alarm occurs
AL0 AL1 AL2
AL0- AL0-
AL1 AL2
Open Closed
Closed Open
Open Closed