Danfoss VLT Micro Drive FC 51 Series Programming Manual page 29

4. Parameter Descriptions
Limitation:
Too short ramp up time can result in Torque limit warning (W12) and/or DC over voltage warning (W7). Ramping is stopped when the frequency converter
has reached Torque limit motor mode (par. 4-16).
Too short ramp down time can result in Torque limit warning (W12) and/or DC over voltage warning (W7). Ramping is stopped when the frequency
converter reaches the Torque limit generator mode (par. 4-17) and/or the internal DC over voltage limit.
3-40 Ramp1 Type
Option:
Linear
*
[0]
[2] S-ramp
4
3-41 Ramp1 Ramp-up Time
Range:
*
3.00 s [0.05 - 3600.00 s ]
3-42 Ramp1 Ramp-down Time
Range:
*
3.00 [0.05 - 3600.00 s]
4.4.5. 3-5* Ramp2
See par. 3-4* for a description of ramp types.
NB!
Ramp2 - alternative ramp times:
Changing from Ramp1 to Ramp2 is done via the digital input. See par. 5-1*, selection [34].
3-50 Ramp2 Type
Option:
Linear
*
[0]
[2] S-ramp
3-51 Ramp2 Ramp-up Time
Range:
*
3.00 s [0.05 - 3600.00 s]
3-52 Ramp2 Ramp-down Time
Range:
3.00 s [0.05 - 3600.00 s]
4.4.6. 3-8* Other Ramps
This section contains parameters for Jog and Quick Stop Ramps.
With a Jog Ramp you can both ramp up and down whereas you can only ramp down with the Quick Stop Ramp.
28
Function:
Constant acceleration/deceleration.
Smooth jerk compensated acceleration/deceleration.
Function:
Enter ramp-up time from 0 Hz to rated motor frequency (f
Choose a ramp-up time ensuring that torque limit is not exceeded, see par. 4-16.
Function:
Enter ramp down time from rated motor frequency (f
Choose a ramp down time that does not cause over-voltage in inverter due to regenerative operation of motor.
Furthermore, regenerative torque must not exceed limit set in par. 4-17.
Function:
Constant acceleration/deceleration.
Smooth jerk compensated acceleration/deceleration.
Function:
Enter ramp-up time from 0 Hz to rated motor frequency (f
Choose a ramp-up time ensuring that torque limit is not exceeded, see par. 4-16.
Function:
Enter ramp down time from rated motor frequency (f
Choose a ramp down time that does not cause over-voltage in inverter due to regenerative operation of motor.
Furthermore, regenerative torque must not exceed limit set in par. 4-17.
MG.02.C4.02 - VLT is a registered Danfoss trademark
VLT Micro Drive FC 51
) set in par. 1-23.
M,N
) in par. 1-23 to 0 Hz.
M,N
) set in par. 1-23.
M,N
) in par. 1-23 to 0 Hz.
M,N