YASKAWA P7, User Manual, Page: 102 / 256

Programming 5 - 18
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b5-10 PI Output Gain Setting
Setting Range: 0.0 to 25.0
Factory Default: 1.0
Applies a multiplier to the output of the PI function. Using the gain can be helpful when the PI function is used to trim the
Speed Command. Increasing b5-10 causes the PI function to have a greater regulating affect on the speed command.
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b5-11 PI Reverse Selection
Parameter b5-11 determines whether reverse operation is allowed while using PI control (b5-01
≠
0). The factory default setting
will not allow the Drive to run in reverse. This parameter does not need to be changed from factory default for a majority of
HVAC applications. (Refer also to b5-09).
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b5-12 PI Feedback Reference Missing Detection Selection
Loss of feedback can cause problems to a PI application. The Drive can be programmed to turn on a digital output whenever a
loss of feedback occurs. Feedback Loss Detection is turned on by b5-12. When b5-12= “1: Alarm”, the Drive acknowledges
the loss of feedback without stopping or turning on the fault output (MA-MB). If b5-12= “2: Fault”, the Drive coasts to a stop
and turns on the fault output if the feedback is determined to be lost.
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b5-13 PI Feedback Loss Detection Level
Setting Range: 0 to 100%
Factory Default: 0%
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b5-14 PI Feedback Loss Detection Time
Setting Range: 0.0 to 25.0 Seconds
Factory Default: 1.0 Seconds
The Drive interprets feedback loss whenever the feedback signal drops below the value of b5-13 and stays below that level for
at least the time set into b5-14. See Figure below for timing details.
Fig. 17 Loss of PI Feedback Feature
Setting Description
0 0 Limit (factory default)
1 Reverse
Setting Description
0 Disabled (factory default)
1 Alarm
2 Fault
Measured
Feedback
T
t
Feedback
Loss Output
T
b5-13
T = b5-14
Feedback
Loss Digital Output
ON (CLOSED)
OFF (OPEN)
TIME