Danfoss VLT FC 100 Series Programming Guide

3-41 Ramp 1 Ramp up Time
Range: Function:
10 s * [1 - 3600 s]
Enter the ramp-up time, i.e. the acceleration time from 0 RPM to the rated motor speed n
M,N
(par. 1-25). Choose
a ramp-up time such that the output current does not exceed the current limit in par. 4-18 during ramping. See
ramp-down time in par. 3-42.
par .3 − 41 =
tacc × nnorm par .1 − 25
Δ ref rpm
s
See drawing above!
3-42 Ramp 1 Ramp Down Time
Range: Function:
20 s * [1 - 3600 s]
Enter the ramp-down time, i.e. the deceleration time from the rated motor speed n
M,N
(par. 1-25) to 0 RPM.
Choose a ramp-down time such that no over-voltage arises in the inverter due to regenerative operation of the
motor, and such that the generated current does not exceed the current limit set in par. 4-18. See ramp-up time
in par. 3-41.
par .3 − 42 =
tdec × nnorm par .1 − 25
Δ ref rpm
s
3.5.4. 3-5* Ramp 2
Choosing ramp parameters, see 3-4*.
3-51 Ramp 2 Ramp up Time
Range: Function:
3 s * [1 - 3600 s]
Enter the ramp-up time, i.e. the acceleration time from 0 RPM to the rated motor speed (n
M,N
) (par. 1-25). Choose
a ramp-up time such that the output current does not exceed the current limit in par. 4-18 during ramping. See
ramp-down time in par. 3-52.
par .3− 51 =
tacc × nnorm par .1− 25
Δ ref rpm
s
3-52 Ramp 2 Ramp down Time
Range: Function:
3 s * [1 - 3600 s.]
Enter the ramp-down time, i.e. the deceleration time from the rated motor speed (n
M,N
) (par. 1-25) to 0 RPM.
Choose a ramp-down time such that no over-voltage arises in the inverter due to regenerative operation of the
motor, and such that the generated current does not exceed the current limit set in par. 4-18. See ramp-up time
in par. 3-51.
par .3 − 52 =
tdec × nnorm par .1− 25
Δ ref rpm
s
3.5.5. 3-8* Other Ramps
Configure parameters for special ramps e.g. Jog or Quick Stop.
3-80 Jog Ramp Time
Range: Function:
20 s * [1 - 3600 s]
Enter the jog ramp time, i.e. the acceleration/deceleration time between 0 RPM and the rated motor speed
(n
M,N
) (set in par. 1-25 Motor Nominal Speed ). Ensure that the resultant output current required for the given
jog ramp time does not exceed the current limit in par. 4-18. The jog ramp time starts upon activation of a jog
signal via the control panel, a selected digital input, or the serial communication port.
par .3− 80 =
tjog × nnorm par .1− 25
Δ jog speed par .3− 19
s
VLT
®
HVAC Drive Programming Guide 3. Parameter Description
MG.11.C5.02 - VLT
®
is a registered Danfoss trademark 57
3

Danfoss VLT FC 100 Series Specifications

General

Brand	Danfoss
Model	VLT FC 100 Series
Category	DC Drives
Language	English