Lenze MC3000 Series - Manual (Page 60)

56 13435743_EDBM301_v14 .0
When the commanded speed falls below the SLEEP THRESHOLD setting for the defined
SLEEP DELAY time (refer to Parameter 37), the drive will "go to sleep" and the motor
will go to zero speed . The drive will remain "sleeping" until 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 1:
While the the drive is in Sleep Mode, the Status portion of the display will
read SLEEP .
NOTE 2: 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 .
NOTE 3: 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 .
37 SLEEP DL (SLEEP DELAY)
This parameter sets the amount of time the drive must operate below the SLEEP
THRESHOLD (refer to Parameter 36) 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's display will indicate SLEEP, 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 ramp the
motor up to the commanded speed .
38 SLEEP BW (SLEEP BANDWIDTH)
This parameter allows the PID feedback signal to determine when the drive should "wake
up" when operating in Sleep Mode . In process systems that utilize Integral Gain (refer to
Parameter 78), 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 decrease or increase
(depending on whether the system is normal or reverse-acting) by the programmed
amount before the drive will "wake up" . This parameter is set in PID units .
Example:
In a normal-acting system, the PID 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 .
NOTE: If SLEEP BANDWIDTH is set to 0, this function is disabled, and the drive will
wake up when the commanded speed exceeds the SLEEP THRESHOLD
plus 2 Hz, as described in Parameters 36 and 37 .
39 TB5 MIN (TERMINAL TB-5 INPUT)
This parameter selects the output frequency of the drive that will correspond to the
minimum analog speed reference input (0 VDC or 4 mA) . This parameter is used in
conjunction with Parameter 40 - TB5 MAX to define a speed range that corresponds to
the analog speed reference input (0 - 10 VDC or 4 - 20 mA) .