Firmware Manual

Appendix A—Description of Parameters
172 PowerXL DG1 Series Adjustable Frequency Drives MN040004EN—March 2014 www.eaton.com
P10.49 1355 PID1 Set Point 2 Comp Max 2, 3, 4 RW
Value added proportionally to the frequency, setpoint compensation = comp max *
(output freq–min freq)/(max freq–min freq).
Procedure for setting up PID Application:
Initially set PID Gain (P10.1) to 0.0% and set the PID I Time (P10.2) to 20 sec. Start
the frequency converter and verify if the setpoint is reached quickly while
maintaining stable operation of the system. If not increase the PID Gain (P10.1) until
the drive speed oscillates constantly. After this occurs reduce the PID Gain (P10.1)
slightly to reduce the oscillation. From here take the value found for PID Gain (P10.1)
to 0.5 times that value and reduce the PID I time (P10.2) until the feedback signal
oscillates again. Increase the PID I time (P10.2) until the oscillation stops, with that
value take it times 1.2 and use that value for the PID I time (P10.2). If signal noise is
seen at high frequency increase the filter time varies to filter the signal. If further
tuning is required refer to the table showing what is affected.
Figure 65. Setting up PID Application
P11.1 1356 PID2 Control Gain 3, 4 RW
See P10.1.
P11.2 1357 PID2 Control ITime 3, 4 RW
See P10.2.
P11.3 1358 PID2 Control DTime 3, 4 RW
See P10.3.
Code Modbus ID Parameter Application
RO/RW
Peak
Time
Desired
Amplitude
Overshoot
Steady State
Error
Settling Time
Rise Time
12108642
0.05
0
0.10
0.15
0.20
0.25
0.30
0.35
0.40
0.45
0.50
Rise Time—the time required for the output to rise 90% of the desired level for
the first time.
Overshoot—the difference between the peak level and the steady state level.
Setting Time—time required for the system to converge to its steady state.
Steady State Error—the difference between the steady state level and the desired
output level.
Response Rise Time Overshoot Settling Time Steady State Error
Increase PID Gain Decrease Rise Increases Overshoot Not Affected Decreases Error
Increase PID1 Time Decrease Rise Increases Overshoot Increases Setting Eliminates Error
Increase PID0 Time Not Affected Decreases Overshoot Decreases Setting Not Affected