Hitachi SJ300-037HFE 사용자 설명서
SJ300 Inverter
Oper
ati
ons
ons
and Monitor
ing
4–47
Output Deviation
for PID Control
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. Refer to
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. Refer to
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.
prevent the negative-going turn-off spike generated by the coil from damaging the inverter’s
output transistor.
Opt.
Code
Symbol Function Name
Output
State
Description
04
OD
Output deviation
for PID control
for PID control
ON
when PID error is more than the set
threshold for the deviation signal
threshold for the deviation signal
OFF
when PID error is less than the set thresh-
old for the deviation signal
old for the deviation signal
Valid for
outputs:
outputs:
11, 12, 13, 14, 15,
AL0 – AL2
AL0 – AL2
Required
settings:
settings:
C044
Notes:
• The default deviation value is set to 3%. To
• The default deviation value is set to 3%. To
change this value, change parameter C044
(deviation level).
(deviation level).
Set
value
[OD]
Signal
Error
(SP-PV)
C044
C044
ON
ON
t
Process variable
Setpoint
RY
+
–
–
See I/O specs on page
.
Inverter output terminal circuit
CM2
13
14
15
11
12
Example: (Requires output configuration—
see page
see page
):
OD