Yaskawa AC Drive Z1000 Bypass Technical Manual - Manual (Page 134)

n b5-14: PI Feedback Low Detection Time
Sets the time that the PI feedback has to fall below b5-13 before feedback loss is detected.
No. Name Setting Range Default
b5-14 PI Feedback Low Detection Time 0.0 to 25.5 s 1.0 s
n b5-36: PI Feedback High Detection Level
Sets the feedback level used for PI feedback high detection. The PI feedback must exceed this level for longer than the time
set to b5-37 before feedback loss is detected.
No. Name Setting Range Default
b5-36 PI Feedback High Detection Level 0 to 100% 100%
n b5-37: PI Feedback High Detection Time
Sets the time that the PI feedback must exceed the value set to b5-36 before feedback loss is detected.
No. Name Setting Range Default
b5-37 PI Feedback High Detection Time 0.0 to 25.5 s 1.0 s
<1> Details on this function can be found in the standard Z1000 Programming Manual (SIEPC71061645) at
www.yaskawa.com.
n PI Sleep/Snooze
The PI Sleep/Snooze function stops the drive when the PI output or the frequency reference falls below the PID Sleep/Snooze
operation level for a certain time. The drive will resume operating when the PI output or frequency reference rise above the
PI Sleep/Snooze operation level for the specified time. An example of PI Sleep/Snooze operation appears in the figure below.
PI Output
PI Sleep/Snooze
Level (b5-15)
Sleep Delay Time
Sleep Delay Time
Run command enabled
Continues to output “During Run”
Internal Run
command
External Run
command
During Run
Stop
b5-16 b5-16
Run
Figure 5.14 PI Sleep/Snooze Operation
Notes on Using the PI Sleep/Snooze Function
• The PI Sleep/Snooze function is active even when PI control is disabled.
• The PI Sleep/Snooze function stops the motor according to the stopping method set to b1-03.
The PI Snooze Function is a variation on the Sleep Function. Set b5-21 to 2 to select the PI Snooze function. After selecting
the Snooze Function, the drive monitors the output frequency. If the output frequency drops below the PI Snooze Level b5-22
<1> ), and stays below that level for at least the time set to b5-23 <1> , PI Snooze Delay Time, the drive output shuts off.
The Snooze Function differs from the Sleep Function in that the feedback must drop below the level set to b5-24 <1> , PI Snooze
Deactivation Level, before normal drive output will begin again. Immediately prior to Snooze Function activation, the PI
Setpoint can be temporarily increased to create an overshoot of the intended PI Setpoint. The temporary boost is determined
by parameter b5-25 <1> , PI Boost Setting Level.
After reaching the temporary boost level (or exceeding the time set to b5-26, PI Maximum Boost Time), the drive output shuts
off (snoozes) and the intended PI Setpoint returns. From this point on, the Snooze Function operates normally and the drive
output returns when the feedback level drops below b5-24 <1> .
<1> Details on this function can be found in the standard Z1000 Programming Manual (SIEPC71061645) at
www.yaskawa.com.
The parameters necessary to control the PI Sleep/Snooze Function are explained below.
5.2 b: Application
134 YASKAWA ELECTRIC SIEP YAIZ1B 01D YASKAWA AC Drive – Z1000 Bypass Technical Manual