Omron SYSDRIVE MX2 SERIES User Manual page 193

PID Gain Adjustment
If a stable response cannot be obtained in PID function operation, adjust each gain as follows
according to the situation.
The feedback value changes slowly when the target value is changed. → Raise P Gain A072.
The PID feedback value changes fast but isn't stable.
The target and the PID feedback values wouldn't match smoothly. → Lower I Gain A073.
The PID feedback value fluctuates unstably.
Response is slow even with P gain raised.
With P gain raised, the PID feedback value fluctuates and isn't stable.
PID Excessive Deviation (OD)
You can set PID excessive deviation level C044 during PID control. A signal can be output to
a multi-function output terminal when the PID deviation ε reaches the level set in C044 or
above.
Allocate "04: OD" to any Multi-function Output Terminal Selections (C021 to C022) or Relay
Output Function Selection (C026).
C044 can be set from 0 to 100. The setting corresponds to the range of 0 to the maximum
target value.
Feedback Comparison Signal
A signal can be output to a multi-function output terminal when the PID feedback is out of the
specified range.
Allocate "31: FBV" to any Multi-function Output Terminal Selections (C021 to C022) or Relay
Output Function Selection (C026).
PID feedback
ON
FW input
OFF
ON
FBV output
OFF
PID Feedback Value Monitor (d004)
You can monitor the PID feedback value.
The monitor value is displayed as the product of PID Scale (A075).
"d004 display" = "Feedback value [%]" × "PID Scale (A075)"
PID Integral Reset (PIDC)
Clears the integral value of PID operation.
Allocate "24: PIDC" to any Multi-function Input Selections (C001 to C007).
Clears the integral value every time the PIDC terminal is turned on.
Do not turn on the PIDC terminal during PID operation to avoid a possible overcurrent trip. Turn
ON the PIDC terminal after turning OFF PID operation.
SYSDRIVE MX2 Series USER'S MANUAL (3G3MX2-Axxxx)
5-6 Operation Functions
→ Lower P Gain A072.
→ Raise I Gain A073.
→ Raise D Gain A074.
→ Lower D Gain A074.
C052 (OFF level)
C053 (ON level)
Time
5
5-78