60
Activate sleep mode in parameter 403, Sleep Mode Timer. In this
parameter, set how long the output frequency must be lower than the
sleep frequency set in parameter 404, Sleep Frequency, before sleep
mode activates. After the set time, the drive will ramp down the motor to
a stop, as controlled by parameter 207, Ramp Down Time. If the output
frequency needed to meet the system demand rises above the sleep
frequency during the timed period, the drive will simply ramp up to the
demanded frequency.
When the sleep mode timer expires and the drive is stopped in sleep
mode, a theoretical output frequency is calculated based upon the
reference signal. When the theoretical output frequency rises above the
frequency set in parameter 405, Wake-up Frequency, the drive will
restart the motor and ramp up to the commanded reference.
For closed loop operation, it may be useful to “over satisfy” the system
before putting the drive into sleep mode. The boost setpoint parameter
provides for this. After the sleep mode timer expires, the drive will reset
the set point based on the value in parameter 406, Boost Setpoint.
Once this new setpoint is satisfied, the drive enters sleep mode. A
setting of 100% in parameter 406, Boost Setpoint, indicates no setpoint
boost. Boost setpoint is only active in Closed Loop, selected in
parameter 100, Configuration.
403
Sleep Mode Timer
(SLEEP MODE TIMER)
Value:
0 to 300 seconds (OFF)
★
OFF
Function:
This parameter enables the drive to stop the motor if the load on the
system is minimal. The timer starts when the output frequency drops
below the frequency set in parameter 404, Sleep Frequency. When the
time set has passed, the drive will stop. The drive will restart when the
theoretical output frequency exceeds the frequency set in parameter
405, Wake-up Frequency.
Description of choice:
Select OFF if this function is not wanted.
Set the amount of time that the drive must run at or below the sleep
frequency before it stops and “goes to sleep.”
404
Sleep Frequency (SLEEP FREQUENCY)
Value:
0.0 to parameter 405, Wake-up Frequency
★
0.0 Hz
Function:
When the output frequency falls below this set value, the timer set in
parameter 403, Sleep Mode Timer, will start. The drive’s speed will
follow the reference signal until the timer times out.
Description of choice:
Choose the output frequency at which the drive will activate the sleep
mode timer. It is generally best to set SLEEP FREQUENCY equal to the
minimum frequency set in parameter 201, Output Frequency Low Limit
and parameter 204, Minimum Reference. This is because the sleep
mode isn’t active until after the drive output frequency equals the sleep
frequency. If the sleep frequency is less than the minimums, the sleep
mode cannot activate.
✭
Indicates default parameter. Depending upon the application, the drive may be delivered with other parameters selected.