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Appendix A—Description of parameters
POWERXL DH1 SERIES ADJUSTABLE FREQUENCY DRIVES MN040041EN—August 2019 www.eaton.com
Code Modbus ID Parameter Application RO/RW
P7.3.3.9 1329 PID1 Set Point 2 Boost 2,3 RW
Use this parameter to set the value the set point can be boosted when going into sleep mode. This
is an additive variable that will add to the setpoint before drive output goes to sleep to prevent premature
cycling.
P7.3.3.10 1354 PID1 Set Point 2 Comp Enable 2,3 RW
Use this parameter to enables pressure loss compensation for set point 2 signal value. This is used
in pump systems to compensate the pressure loss that occurs at the end of the pipe line due to the
liquid flow.
P7.3.3.11 1355 PID1 Set Point 2 Comp Max 2,3 RW
Use this parameter to set the maximum compensation for the PID setpoint value that is applied to the output
frequency of the drive is at its maximum frequency level. This value is added to the actual setpoint value as a
function of the output frequency.
Set Point Compensation = comp max * (output freq–min freq)/(max freq–min freq).
Procedure for setting up PID Application:
Initially set PID Gain(Para ID1294) to 0.0% and set the PID I Time (Para ID1295) to 20 sec. Start the frequency
converter and verify if the set point is reached quickly while maintaining stable operation of the system. If
not increase the PID Gain (Para ID1294) until the drive speed oscillates constantly. After this occurs reduce
the PID Gain (Para ID1294) slightly to reduce the oscillation. From here take the value found for PID Gain (Para
ID1294) to 0.5 times that value and reduce the PID I time (Para ID1295) until the feedback signal oscillates
again. Increase the PID I time (Para ID1295) until the oscillation stops, with that value take it times 1.2 and
use that value for the PID I time (Para ID1295). If signal noise is seen at high frequency increase the filter
time value to filter the signal. If further tuning is required refer to the table showing what is effected.
Figure 69. Setting up PID application
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
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.
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
P7.4.1.1 1330 PID1 Feedback Function 2,3 RW
Use this parameter to select if the feedback value is taken form a single signal or a combination of
two signals. The mathematical functions can be selected that is used when two feedback signals
are combined.
P7.4.1.2 1331 PID1 Feedback Gain 2,3 RW
Use this parameter to set the gain associated with feedback signal from the measuring signals defined in the
feedback function.
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