Hitachi SJ100 Series Instruction Manual page 127

Overload Advance Notice Signal
When the output current exceeds a preset
value, the [OL] terminal signal turns on.
The parameter C41 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 Terminal
Function Name
Code Symbol
03 OL Overload advance
notice signal
11, 12, AL0 – AL2
Valid for outputs:
Required settings: C41
Notes:
•
The default value is 100%. To change the level
from the default, set C41 (overload level).
•
The accuracy of this function is the same as the
function of the output current monitor on the [FM]
terminal (see page 4–28).
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.
Current
C41
set
value
C41
[OL]
Signal
threshold
Output
State
ON when output current is more than the set thresh-
old for the overload signal
OFF when output current is less than the set threshold
for the overload signal
Example:
Inverter output
terminal circuit
H O OI
See I/O specs on page 4–5.
4–23
SJ100 Inverter
threshold
power running
regeneration
threshold
ON ON
time
Description
OL
FM CM2
L 12 11
+
RY
–