Yaskawa P7 Drive User Manual - Manual (Page 103)

Programming 5 - 19
b5-15 Sleep Function Start Level
Setting Range: 0.0 to 200.0 Hz
Factory Default: 0.0 Hz
b5-16 Sleep Delay Time
Setting Range: 0.0 to 25.5 Seconds
Factory Default: 0.0 Seconds
The Sleep Function can be programmed to prevent running the Drive when the PI loop output or the speed command is so low
that no usable work is being done and/or equipment damage may result. The Sleep Function can be Enabled by entering a value
in parameter b5-15. If the Drive’s output drops below the level set by the Sleep Function Start Level (b5-15) and remains there
at least as long as the delay time determined by the Sleep Delay Time (b5-16), then the Drive’s internal Run command drops out
and the Drive output ceases. Though the Drive’s output has ceased, all other Drive functions continue. Once the Drive’s
theoretical output returns to a level above the Sleep Function Start Level (b5-15) and remains above that level for at least the
Sleep Delay Time (b5-16), the internal Run command returns and the Drive output begins again. The b5-16 Delay Time
prevents oscillation about the sleep level.
Note: The sleep function can be used even if the PI function is disabled (b5-01 = “0: Disabled”).
Fig. 18 Sleep Function Response
b5-17 PI Accel/Decel Time
Setting Range: 0.0 to 25.5 Seconds
Factory Default: 0.0 Seconds
This is a soft start function that is applied to the PI setpoint analog input. Instead of having nearly instantaneous changes in sig-
nal levels, there is a programmed ramp applied to level changes. When changing setpoints the error can be limited by gradu-
ally ramping the setpoint through the use of parameter b5-17.
b5-18 PI Setpoint Selection
Setting Description
0 Disabled (factory default)
1 Enabled
Sleep Level
Outpu t
Speed Command
Upper Limit
d2-01
Output
Speed Command
b5-15