Hitachi SJ7002 Series Instruction Manual page 208

4–46
Using Intelligent Output Terminals
Overload
Advance Notice
Signal
03=[OL]
Opt. Code
and
26=[OL2]
Symbol
[11 to [15],
Valid for
[ALx]
Outputs
Required
C041, C111
Settings
Default
Requires
terminal config.
Output Deviation
for PID Control
04
Opt. Code
[OD]
Symbol
[11 to [15],
Valid for
[ALx]
Outputs
Required
C044
Settings
Default
Requires
config.
terminal
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.
Symbol Function Name
OL Overload advance notice signal (1)
OL2 Overload advance notice signal (2)
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
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.
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.
Current
C041
Set
value
C041
[OL]
Signal
ON
Description
ON when output current is more than the set
threshold for the overload signal (C041)
ON when output current is more than the set
threshold for the overload signal (C111)
4–66).
Error
(SP-PV)
C044
Set
value
C044
[OD]
Signal
ON
threshold
power running
regeneration
threshold
ON
t
Process variable
Setpoint
ON
t