Using Intelligent Output Terminals
Oper
ations
a
nd Moni
tor
ing
4–46
Overload
Advance Notice
Signal
When the output current exceeds a
preset value, the [OL] or [OL2]
terminal signal turns ON. Parameter
C041 sets the overload threshold for
[OL]; parameter C111 sets it for
[OL2]. 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.
Note the following:
• The default threshold 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 4–66
).
NOTE:
If you use an intelligent output to drive an external relay, be sure to connect a diode
across the relay coil. This will prevent the negative-going turn-off spike generated by the coil
from damaging the inverter’s output transistor.
Output Deviation
for PID Control
The PID loop error is defined as the
magnitude (absolute value) of the differ-
ence between the Setpoint (target value)
and the Process Variable (actual value).
When the error magnitude exceeds the
preset value for C044, the [OD] terminal
signal turns ON. The default deviation
value is set to 3%. To change this value,
change parameter C044 (deviation
level). Refer to
“PID Loop Operation”
on page 4–75
.
NOTE:
If you use an intelligent output to drive an external relay, be sure to connect a diode
across the relay coil. This will prevent the negative-going turn-off spike generated by the coil
from damaging the inverter’s output transistor.
Opt. Code
and
Symbol
03=[OL]
26=[OL2]
Valid for
Outputs
[11 to [15],
[ALx]
Required
Settings
C041, C111
Default
terminal
Requires
config.
Symbol
Function Name
Description
OL
Overload advance notice signal (1)
ON when output current is more than the set
threshold for the overload signal (C041)
OL2
Overload advance notice signal (2)
ON when output current is more than the set
threshold for the overload signal (C111)
Set
value
[OL]
Signal
C041
C041
ON
ON
t
Current
threshold
power running
regeneration
threshold
Opt. Code
04
Symbol
[OD]
Valid for
Outputs
[11 to [15],
[ALx]
Required
Settings
C044
Default
terminal
Requires
config.
Set
value
[OD]
Signal
Error
(SP-PV)
C044
C044
ON
ON
t
Process variable
Setpoint
