Omron 3G3M1-A4004-ECT - Page 472

PID Reverse Output
If the PID calculation results are negative during regular PID control (300EHex-02Hex = 1, 2), the fre-
quency reference to the inverter is limited at 0 Hz. If “4: Process normal operation, opposite operation
available” or “5: Process inverse operation, opposite operation available” is set to PID Control Func-
tion Selection (300EHex-02Hex), an opposite operation can be performed for the inverter if the PID
calculation results are negative.
If 4 or 5 is set to PID Control Function Selection (300EHex-02Hex), PID Control PID Output Variable
Range for Process Control (301FHex-15Hex) is disabled.
PID Gain Adjustment
If the PID function does not provide a stable response, adjust each gain as described below depend-
ing on the state.
State Adjustment method
Changes in target value are not reflected quickly on feedback val-
ue.
Increase PID P Gain 300EHex-04Hex
Changes are reflected quickly on feedback value, but not stable. Decrease PID P Gain 300EHex-04Hex
Target and feedback values do not match quickly. Decrease PID I Gain 300EHex-05Hex
Feedback value fluctuates unstably. Increase PID I Gain 300EHex-05Hex
Increasing PID P Gain does not improve response speed. Increase PID D Gain 300EHex-06Hex
Increasing PID P Gain results in fluctuating and unstable feed-
back value.
Decrease PID D Gain 300EHex-06Hex
Excessive PID deviation (OD)
An absolute value warning or a deviation warning can be output in PID control. As a warning output,
allocate “42: OD (Excessive PID deviation)” to Output Terminal [DO1] Function Selection
(3005Hex-15Hex) and Output T
erminal [ROA, ROB] Function Selection (3005Hex-1CHex).
At PID Control Select Warning Output Selection (300EHex-0CHex), set the warning type, and at PID
Control Upper Limit of Warning (AH) (300EHex-0DHex) and PID Control Lower Limit of Warning (AL)
(300EHex-0EHex), set the upper limit value and lower limit value of the warning, respectively.
300EHex-0CHex Type Description
0
Warning caused by process
command value
“OD" is ON when PV < AL or AH < PV
PID Control
Lower Limit of Warning (AL)
(300EHex-0EHex)
PID Control
Upper Limit of Warning (AH)
(300EHex-0DHex)
PID feedback
value (PV)
1
Warning from absolute val-
ue with hold
Same as above (with hold)
2
Warning from absolute val-
ue with latch
Same as above (with latch)
3
Warning from absolute val-
ue with hold and latch
Same as above (with hold and latch)
8 Other Functions
8-118
M1 Series EtherCAT Type User’s Manual (I670)