Operating instructions

3-55 Ramp 2 S-ramp Ratio at Accel. Start
Range: Function:
50 % * [Application
dependant]
Enter the proportion of the total ramp-up
time (par. 3-51 Ramp 2 Ramp up Time) in
which the acceleration torque increases.
The larger the percentage value, the
greater the jerk compensation achieved,
and thus the lower the torque jerks in the
application.
3-56 Ramp 2 S-ramp Ratio at Accel. End
Range: Function:
50 % * [Application
dependant]
Enter the proportion of the total ramp-up
time (par. 3-51 Ramp 2 Ramp up Time) in
which the acceleration torque decreases.
The larger the percentage value, the
greater the jerk compensation achieved,
and thus the lower the torque jerks in the
application.
3-57 Ramp 2 S-ramp Ratio at Decel. Start
Range: Function:
50 % * [Application
dependant]
Enter the proportion of the total ramp-
down time (par. 3-52 Ramp 2 Ramp down
Time) where the deceleration torque
increases The larger the percentage value,
the greater the jerk compensation
achieved, and thus the lower the torque
jerks in the application.
3-58 Ramp 2 S-ramp Ratio at Decel. End
Range: Function:
50 % * [Application
dependant]
Enter the proportion of the total ramp-
down time (par. 3-52 Ramp 2 Ramp down
Time) where the deceleration torque
decreases. The larger the percentage
value, the greater the jerk compensation
achieved, and thus the lower the torque
jerks in the application.
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:
Applica-
tion
[1.00 -
3600.00
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 Current Limit. The jog
ramp time starts upon activation of a jog
3-80 Jog Ramp Time
Range: Function:
depend-
ent
*
signal via the control panel, a selected digital
input, or the serial communication port.
par . 3 − 80 =
tjog × nnorm par . 1 − 25
jog speed par . 3 − 19
s
3-81 Quick Stop Ramp Time
Range: Function:
Applica-
tion
depend-
ent
*
[0.01 -
3600.00 s]
Enter the quick–stop ramp-down time, i.e.
the deceleration time from the synchro-
nous motor speed to 0 RPM. Ensure that
no resultant over-voltage will arise in the
inverter due to regenerative operation of
the motor required to achieve the given
ramp-down time. Ensure also that the
generated current required to achieve the
given ramp-down time does not exceed
the current limit (set in par. 4-18 Current
Limit). Quick-stop is activated by means of
a signal on a selected digital input, or via
the serial communication port.
Parameter Description
VLT
®
HVAC Drive Programming Guide
52 MG.11.CA.02 - VLT
®
is a registered Danfoss trademark
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