Hitachi L300P Series

L300P Inverter
Operations
and Monitoring
4–39
Overload
Advance Notice
Signal
When the output current exceeds a
preset value, the [OL] or [OL2]
terminal signal turns ON. The parame-
ter C041 (or C111, respectively) sets
the overload threshold. The overload
detection circuit operates during
powered motor operation and during
regenerative braking. The output relay
contacts are closed when the inverter is
in overload (normally open logic).
NOTE: The example circuit in the table above drives a relay coil. Note the use of a diode to
prevent the negative-going turn-off spike generated by the coil from damaging the inverter’s
output transistor.
Opt.
Code
Symbol Function Name
Output
State
Description
03 OL Overload advance
notice signal (1)
ON when output current is more than the set
threshold for the overload signal (C041)
OFF when output current is less than the set
threshold for the overload signal (C041)
Valid for
outputs:
11, 12, AL0 – AL2
Required
settings:
C041
Notes:
• The default value is 100%. To change the
level from the default, set C041 (overload
level).
• The accuracy of this function is the same as
the function of the output current monitor on
the [FM] terminal (see “
Analog Output
Operation” on page 4–54).
Set
value
[OL]
Signal
C041
C041
t
Current
threshold
power running
regeneration
threshold
See I/O specs on page 4–8
.
Inverter output terminal circuit
12C 12A 11C 11A
24VDC
L
Example: (Requires output configuration—
see page 3–48
.)
+
–
OL