60 SF01U
P74 ANALOG INPUT FILTER
This adjusts the filter on the analog input terminals (TB-5 and TB-25) to reduce the effect of any
electrical noise that may be present on the analog input signals. This filter works both in PI mode
and standard speed control mode. It should be set to the lowest value that yields acceptable
performance, as setting it too high may cause the drive to react too slowly to signal changes.
The range of adjustment is 1 to 1000, which actually corresponds to 0.01 to 10.0 seconds.
P75 SLEEP THRESHOLD
The PI option has a Sleep Mode function that allows the drive to cease operation when
system demand falls below a preset level. This is to prevent the the motor from operating at
low speeds for long periods of time.
When the commanded speed falls below the SLEEP THRESHOLD setting for the defined
SLEEP DELAY time (see P76 below), the drive will "go to sleep" and the motor will stop.
The drive will remain "sleeping" until the it is commanded to operate at a speed that is 2 Hz
above the SLEEP THRESHOLD, at which point it will "wake up" and ramp the motor up to
the commanded speed.
NOTE
• While the drive is in Sleep Mode, the display will read "SLP".
• If the drive's commanded speed goes below the SLEEP THRESHOLD,
the SLEEP DELAY timer will start to count down. If the commanded speed
equals or exceeds the SLEEP THRESHOLD before the SLEEP DELAY
times out, the SLEEP DELAY timer will be reset.
• If the drive is in a Stop state, and the commanded speed is below the
SLEEP THRESHOLD, the drive will immediately go to sleep upon a Start
command, bypassing the SLEEP DELAY.
P76 SLEEP DELAY
This sets the amount of time the drive must operate below the SLEEP THRESHOLD (see P75
above) before the drive "goes to sleep" and brings the motor to zero speed.
Example: SLEEP THRESHOLD is set to 15 Hz and SLEEP DELAY is set to 60 seconds. If the
drive operates below 15 Hz for 60 seconds, the drive will go to sleep and the motor will stop.
The drive will display "SLP", and the drive will remain sleeping until the drive is commanded
to a speed equal to or greater than 17 Hz. At this point, the drive will wake up and and ramp
the motor up to the commanded speed. This example assumes that SLEEP BANDWIDTH
(P77) is set to 0.
P77 SLEEP BANDWIDTH
This allows the PI feedback signal to determine when the drive should "wake up" when
operating in Sleep Mode. In process systems that utilize Integral Gain (see P65), the drive
may cycle in and out of Sleep Mode more often than desired, due to the Integral function of
the PID algorithm.
When SLEEP BANDWIDTH is used, the feedback signal must change by the programmed
amount before the drive will wake up.
Example: In a normal-acting system, the PI setpoint is 50 PSI, SLEEP THRESHOLD is set
to 20 Hz, and SLEEP BANDWIDTH is set to 5 PSI. The drive will enter Sleep Mode when the
commanded speed drops below 20 Hz for the time defined in SLEEP DELAY. The drive will
wake up when the feedback signal drops below 45 PSI (50 PSI setpoint minus 5 PSI bandwidth
= 45 PSI), even if the commanded speed is still below 20 Hz.
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