Veichi JT550 Series Manual page 110

Chapter 7 Maintenance and Troubleshooting
It decides the regulating intensity of the PID regulator on the deviation change. The longer the
differential time is, the larger the regulating intensity is. Differential time is the time within which the
feedback value change reaches 100.0%, and then the adjustment amplitude reaches the maximum frequency.
FA.08
In some situations, only when the PID output frequency is a negative value (inverter reverse rotation),
PID setting and PID feedback can be equal. However, too high reverse rotation frequency is prohibited in
some applications, and FA-08 is used to determine the reverse rotation frequency upper limit.
FA.09
If the deviation between PID feedback and PID setting is smaller than the value of FA.09, PID control
stops. The small deviation between PID feedback and PID setting will make the output frequency stabilize,
effective for some closed-loop control applications.
FA.10
It is used to set the PID differential output range. In PID control, the differential operation may easily
cause system oscillation. Thus, the PID differential regulation is restricted to a small range.
FA.11
The PID setting change time indicates the time required for PID setting changing from 0.0% to 100.0%.
The PID setting changes linearly according to the change time, reducing the impact caused by sudden setting
change on the system.
FA.12
FA.13
FA.12 is used to filter the PID feedback, helping to reduce interference on the feedback but slowing
the response of the process closed-loop system.
FA.13 is used to filter the PID output frequency, helping to weaken sudden change of the inverter
output frequency but slowing the response of the process closed-loop system.
FA.15 Proportional gain Kp2
FA.16
FA.17
PID parameter switchover
FA.18
condition
PID parameter switchover
FA.19
deviation 1
PID parameter switchover
FA.20
deviation 2
FA-15 to FA-20: On some applications, switchover to another set of PID parameters may be required
to fine tune the overall performance as load conditions can vary during the different machine cycles.These
parameters are used for switchover between two groups of PID parameters.Switchover can be implemented
via a DI terminal or automatically implemented according to PID error level..
Cut-off frequency of
PID reverse rotation
PID deviation limit
PID differential limit
PID setting change time
PID feedback filter time
PID output filter time
Integral time Ti2
Differential time Td2
Range:0.00 to max.freq
Range:0.0%~100.0%
Range:0.00%~100.00%
Range:0.00~650.00s
Range:0.00~60.00s
Range:0.00~60.00s
Range:0.0~100.0
Range:0.01s~10.00s
Range:0.000s~10.000s
Range:0~2
Range:0.0%~FA.20
Range:FA.19~100.0%
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JT550 Series Inverter Manual
Default:2.00Hz
Default:0.0%
Default:0.10%
Default:0.00s
Default:0.00s
Default:0.00s
Default:20.0
Default:2.00s
Default:0.000s
Default:0
Default:20.0%
Default:80.0%