Veichi JT550 Series Manual page 111

JT550 Series Inverter Manual
FA.21
FA.22 PID initial value holding time
When the inverter starts up, the PID starts closed-loop algorithm only after the PID output is fixed to
the PID initial value (FA.21) and lasts the time set in FA.22.
Maximum deviation between
FA.23 two PID outputs in forward
direction
Maximum deviation between
FA.24 two PID outputs in reverse
direction
This function is used to limit the deviation between two PID outputs (2 ms per PID output) to suppress
the rapid change of PID output and stabilize the running of the inverter.
FA.23 and FA.24 respectively correspond to the maximum absolute value of the output deviation in
forward direction and in reverse direction.
FA.25
Unit's digit (Integral separated)
0: Invalid
1: Valid
If it is set to valid, , the PID integral operation stops when the X allocated with function 38 "PID
integral pause" is ON In this case, only proportional and differential operations take effect.
If it is set to invalid, integral separated remains invalid no matter whether the X allocated with function
38 "PID integral pause" is ON or not.
Ten's digit (Whether to stop integral operation when the output reaches the limit)
0: Continue integral operation
1: Stop integral operation
Whether to stop integral operation when the output reaches the limit
If "Stop integral operation" is selected, the PID integral operation stops, which may help to reduce the
PID overshoot.
Detection value of PID feedback
FA.26
loss
FA.27 Detection time of PID feedback loss
These parameters are used to judge whether PID feedback is lost.
If the PID feedback is smaller than the value of FA.26 and the lasting time exceeds the value of FA.27,
the inverter reports Err31 and acts according to the selected fault protection action.
FA.28 PID operation at stop
It is used to select whether to continue PID operation in the state of stop. Generally, the PID operation
stops when the inverter stops.
PID initial value
PID integral property
Range:0.0%~100.0%
Range:0.00~650.00s
Range:0.00%~100.00%
Range:0.00%~100.00%
Range:11
Range:0.0%: Not judging feedback
loss 0.1%–100.0%
Range:0.0s~20.0s
0: No PID operation at stop
1: PID operation at stop
- 111 -
Chapter 7 Maintenance and Troubleshooting
Default:0.0%
Default:0.00s
Default:1.00%
Default::1.00%
Default:00
Default:
0.0%
Default:0.0s
0