Yaskawa P7B Drive Bypass - Manual (Page 125)

Programming 5 - 31
" b5-08 PI Primary Delay Time Constant
Setting Range: 0.00 to 10.00 Seconds
Factory Default: 0.00 Seconds
Acts as a time based filter that lowers the responsiveness of the PI function, but also makes the function more stable when the
setpoint varies rapidly or when the feedback is noisy.
" b5-09 PI Output Level Selection
Normally, the output of the PI function causes an increase in motor speed whenever the measured feedback is below the
setpoint. This is referred to as direct acting response. However, if b5-09= “1: Reverse Output”, the output of the PI function
causes the motor to slow down when the feedback is below the setpoint. This is referred to as reverse acting response.
" 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.
" 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).
" 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.
Setting Description
0 Normal Output (direct acting) (factory default)
1 Reverse Output (reverse acting)
Setting Description
0 0 Limit (factory default)
1 Reverse
Setting Description
0 Disabled (factory default)
1 Alarm
2 Fault