Omron SYSDRIVE MX2 SERIES - Page 193

5-78
5-6 Operation Functions
SYSDRIVE MX2 Series USER'S MANUAL (3G3MX2-Axxxx)
5
Functions
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. → Lower P Gain A072.
 The target and the PID feedback values wouldn't match smoothly. → Lower I Gain A073.
 The PID feedback value fluctuates unstably. → Raise I Gain A073.
 Response is slow even with P gain raised. → Raise D Gain A074.

With P gain raised, the PID feedback value fluctuates and isn't stable. → Lower D Gain A074.
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 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.
PID feedback
FW input
FBV output
C052 (OFF level)
C053 (ON level)
Time
ON
OFF
ON
OFF