Yaskawa E7B Drive Bypass - Manual (Page 130)

Programming 5 - 36
b5-26 PI Maximum Boost Time
Setting Range: 0 to 3600 Seconds
Factory Default: 0 Seconds
Associated with the Snooze Function. In cases where the temporary PI Setpoint (intended PI setpoint + PI Setpoint Boost)
cannot be reached within the PI Maximum Boost Time (b5-26), the Setpoint Boost is interrupted and the Drive output is
turned off.
Fig 5.19 Snooze Function Operation
b5-27 PI Snooze Feedback Level
Setting Range: 0 to 100%
Factory Default: 60%
This is a second method of initiating the Snooze Function. If the PI feedback level exceeds the PI Snooze Feedback Level
(b5-27), then the Drive output shuts off. Once the PI feedback drops below the PI Snooze Deactivation Level (b5-24) then
normal Drive and PI operation return. Snooze activates if both b5-22 and b5-27 conditions are met. There is no time delay for
wake-up.
b5-28 PI Feedback Square Root Function Activation
If b5-28= “1: Enabled”, the square root of the PI feedback is compared to the PI Setpoint in order to determine appropriate
Drive output to properly regulate the system. This is helpful in cases where the measured feedback is pressure, but the PI loop
needs to regulate flow.
Setting Description
0 Disabled (factory default)
1 Enabled
PI Feedback
PI Setpoint
PI Output
Snooze
Function
t
t
t
b5-22
b5-23
b5-23
Either PI
Feedback
reaches the new
boosted setpoint
value or the
maximum boost
time is reached.
b5-24
ON OFF OFF
PI Output
PI Setpoint
PI Feedback
Snooze
Function
TIME
b5-26
Either PI Feedback
reaches the new
boosted setpoint value
or the maximum boost
time b5-26 is reached.