Overload Advance Notice Signal - Hitachi L200 Series Instruction Manual

4–40
Using Intelligent Output Terminals

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 opera-
tion and during regenerative braking. The
output circuits use open-collector
transistors, and are active low.
Option Terminal
Code Symbol
03 OL
Valid for outputs:
Required settings:
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 4–53).
•
The example circuit for terminal [12] 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.
Output
Function Name
State
Overload Advance ON
Notice Signal
OFF
11, 12, AL0 – AL2
C041
Current
C041
C041
[OL] 1
ON
Signal 0
Description
when output current is more than the set thresh-
old for the overload signal
when output current is less than the set threshold
for the overload signal
Example (requires output configuration—
see page 3–47):
Inverter output
terminal circuit
Example for terminals [AL0], [AL1], [AL2]
(requires output configuration—
4–35
see pages and 3–47):
Inverter logic
circuit board
AL0
Power
See I/O specs
supply
on page 4–6.
threshold
power running
regeneration
threshold
ON
t
OL
CM2 12 11
+
RY
–
OL
AL1 AL2
Load