Hitachi L300P User Manual
Page 172
Using Intelligent Output Terminals
Oper
ations
a
nd Moni
tor
ing
4–42
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.
N.C. contacts (after initialization)
N.O. contact (inverted by C036 setting)
During normal running
When an alarm occurs or
power is turned OFF
During normal running or
power is turned OFF
When an alarm occurs
AL1
AL0 AL2
AL1
AL0 AL2
AL1
AL0 AL2
AL1
AL0 AL2
Contact
Power
Run
State
AL0-
AL1
AL0-
AL2
N.C.
(after
initialize,
C036=01)
ON
Normal
Closed
Open
ON
Trip
Open
Closed
OFF
–
Open
Closed
Contact
Power
Run
State
AL0-
AL1
AL0-
AL2
N.O.
(set
C036=00)
ON
Normal
Open
Closed
ON
Trip
Closed
Open
OFF
–
Open
Closed