Using Intelligent Output Terminals
Operations
and Monitoring
4–20

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.
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.
power running
C41
set
value
[OL]
Signal time
regeneration
Current
ON ON
threshold
threshold
threshold
C41
Option
Code Terminal
Symbol Function Name Output
State Description
03 OL Overload advance
notice signal 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
Valid for outputs: 11, 12, AL0 – AL2
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 4–25).
CM2
1112
FM
HOIO L
Example:
OL
RY
+
–
Inverter output
terminal circuit
See I/O specs on page 4–5.
Technologies Inc.
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