Output Deviation For Pid Control - Hitachi X200-002SFE/NFU Instruction Manuals

Output Deviation for PID Control

The PID loop error is defined as the
magnitude (absolute value) of the difference
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
56.
Option
Code
04
Valid for inputs:
Required settings
Notes:
• The default difference value is set to 3%. To
change this value, change parameter C044
(deviation level).
• The example circuit for terminal [11] drives a
relay coil. Note the use of a diode to prevent the
negativegoing turn-off spike generated by the
coil from damaging the inverter's output
transistor.
More user manuals on
"PID Loop Operation" on page 4–
Terminal
Function Name
Symbol
OD Output Deviation for
PID Control
11, AL0 – AL2
C044
ManualsBase.com
SP,PV
C044
C044
[OD] 1
signal
0
State Description
ON when PID error is more than the set threshold for
the deviation signal.
OFF when PID error is less than the set threshold for
the deviation signal
Example for terminal [11] (default output
configuration shown – see
Inverter output
terminal circuit
CM2
Example for terminal [AL0], [AL1], [AL2] (requires
output configuration – see
Inverter logic
circuit board
AL0
Power
supply
See I/O specs on page 4-6
4−41
Process variable
Setpoint
ON ON
page 3-54):
OD
11
RY
page 4-35 and 3-54):
OD
AL1 AL2
Load
t