Overload Advance Notice Signal - Hitachi SJ300 Series Instruction Manual

4–46
Using Intelligent Output Terminals
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
circuits use open-collector transistors,
and are active low.
Opt.
Symbol Function Name
Code
03 OL Overload advance
notice signal (1)
26 OL2 Overload advance
notice signal (2)
11, 12, 13, 14, 15,
Valid for
AL0 – AL2
outputs:
C041, C111
Required
settings:
Notes:
• The default value is 100%. To change the
level from the default, set C041 or
C111(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 4–62).
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
C041
Set
value
C041
[OL]
Signal
ON
Output
Description
State
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)
ON when output current is more than the set
threshold for the overload signal (C111)
OFF when output current is less than the set
threshold for the overload signal (C111)
Example: (Default output configuration
shown—see page 3–53.)
Inverter output terminal circuit
+
RY
–
See I/O specs on page 4–9.
threshold
power running
regeneration
threshold
ON
t
OL
14 13 11
CM2
15 12