Hitachi CONVENTION 14 instruction manual 4 42

Overload Advance Notice Signal
When the output current exceeds a preset
value, the [OL] terminal signal turns ON.
The parameter C041 sets the overload
threshold. The overload detection circuit
operates during powered motor operation
and during regenerative braking. The
output circuits use open-collector
transistors, and are active low.
Option
Code
Terminal
Symbol FunctionName State Description
ON when output current is more than the set
threshold for the overload signal
03 OL Overload Advance
Notice Signal
OFF when output current is less than the set threshold
for the overload signal
Validfor inputs: 11, AL0 – AL2
Requiredsettings C041
Notes:
xThe default value is 100%. To change the level
from the default, set C041 (overload level).
xThe 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 4–55).
xThe example circuit for terminal [11] 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.
Example for terminal [11] (default output
configuration shown – see page 3-35):
Example for terminal [AL0], [AL1], [AL2] (requires
output configuration – see page 4-35 and 3-54):
See I/O specs on page 4-6
RY
Inverter output
terminal circuit
CM2 11
OL
AL1
Power
supply Load
AL0 AL2
Inverter logic
circuit board
OL
t
Output
current Threshold
Threshold
C041
C041
Power running
Regeneration
0
1[OL]
signal ON ON
442
Operations and
Monitoring
4 42
Operations and
Monitoring