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206
Ramp Up Time
(RAMP UP TIME)
Value:
1 to 3600 seconds
★
Depends on the unit
Function:
The ramp up time is the acceleration time from 0 Hz to the rated motor
frequency set in parameter 104. It is assumed that the output current
does not reach the current limit set in parameter 215. This determines
the maximum acceleration rate for all modes of operation.
Description of choice:
Program the desired accel time. Too long of a ramp up time can cause
sluggish drive operation. Too short of a ramp up time can cause the
drive to go into current limit during acceleration or cause unacceptable
torque pulses in the controlled system.
NOTE
For fan applications, factory setting of param-
eter 206 is 60 seconds. For pump applications,
factory setting for parameter 206 is 10 seconds.
207
Ramp Down Time
(RAMP DOWN TIME)
Value:
1 to 3600 seconds
★
Depends on the unit
Function:
The ramp-down time is the deceleration time from the rated motor
frequency set in parameter 104 to 0 Hz. This ramp-down time may be
automatically extended to prevent an overvoltage trip if the load
regenerates to the drive. This determines the maximum deceleration
rate for all modes of operation.
Description of choice:
Program the desired decel time. Too long of a ramp down time can
cause sluggish operation. Too short of a ramp down time can cause the
drive to trip off due to high DC bus voltage or cause unacceptable
torque pulses in the controlled system.
NOTE
For fan applications, factory setting of param-
eter 207 is 60 seconds. For pump applications,
factory setting for parameter 207 is 10 seconds.
208
Automatic Ramp Down
(AUTO RAMPING)
Value:
Disable (DISABLE)
[0]
★
Enable (ENABLE)
[1]
Function:
This function ensures that the drive does not trip during deceleration if
the decel time set is too short. If, during deceleration, the DC bus
voltage increases to the maximum value permitted, the drive automati-
cally extends the ramp-down time.
CAUTION
!
If auto ramping is enabled, ramp time can be
considerably longer than that set in parameter
207.
Description of choice:
Program this function as Enable to avoid trips caused by too rapid a
deceleration.
209
Jog Frequency
(JOG FREQUENCY)
Value:
Parameter 201, Output Frequency Low Limit, to parameter 202
Output Frequency High Limit
★
10.0 H
Z
Function:
The jog frequency is the fixed output frequency at which the drive is
running when the jog function is activated.
Jog can be activated via the digital inputs.
Description of choice:
Set the desired frequency.
✭
Indicates default parameter. Depending upon the application, the drive may be delivered with other parameters selected.