Technical information

3-57 Ramp 2 S-ramp Ratio at Decel. Start
Range: Function:
50 %* [Application
dependant]
Enter the proportion of the total
ramp-down time (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 (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
3-80 Jog Ramp Time
Range: Function:
Size
related*
[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 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 4-18 Current Limit. 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
jog speed par . 3 − 19
s
130BA070.10
Time
P 3-80
RPM
P 4-13 RPM
high limit
P 1-25
Motor speed
Jog speed
P 3-19
P 3-80
Ramp up
(acc)
Ramp down
(dec)
t jog t jog
P 4-11 RPM
low limit
3-81 Quick Stop Ramp Time
Range: Function:
Application
dependent*
[0.01 -
3600.00 s]
Enter the quick–stop ramp-down time,
i.e. the deceleration time from the
synchronous 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
4-18 Current Limit). Quick-stop is
activated by means of a signal on a
selected digital input, or via the serial
communication port.
130BA069.10
Time
RPM
P 4-13 RPM
high limit
Reference
P 1-25
Motor speed
low limit
P 4-11 RPM
P 3-81
Qramp
Qstop
Par . 3 − 81 =
t
Qstop
s x n
s
RPM
Δ jog ref
(
par . 3 − 19
)
RPM
3-82 Starting Ramp Up Time
Range: Function:
Size related* [0.01 -
3600.00 s]
The ramp-up time is the
acceleration time from 0rpm to the
nominal motor speed set in
3-82 Starting Ramp Up Time when
Compressor Torque is active in
1-03 Torque Characteristics.
Parameter Description
VLT
®
HVAC Drive Programming Guide
56 MG11CD02 - VLT
®
is a registered Danfoss trademark
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