3-42 Ramp-down Time Running (sec)
Range: Function:
0.30 s* [0.01 - 3,600.00 s] Enter the ramp-down time, i.e., the
deceleration time needed to reach
minimum compressor motor speed.
3-50 Ramp 2 Type
Option: Function:
Select the ramp type, depending on
requirements for acceleration/deceleration. A
linear ramp will give constant acceleration during
ramping. An S-ramp will give non-linear
acceleration, compensating for jerk in the
application.
[0] Linear
[1] S-ramp
Const Jerk
Acceleration with lowest possible jerk
[2] S-ramp
Const
Time
S-ramp based on the values set in
parameter 3-51 Ramp 2 Ramp-up Time and
parameter 3-52 Ramp 2 Ramp-down Time
NOTICE!
If [1] S-ramp Const Jerk is selected and the reference
during ramping is changed the ramp time may be
prolonged in order to realize a jerk free movement
which may result in a longer start or stop time.
Additional adjustment of the S-ramp ratios or switching
initiators may be necessary.
3-51 Ramp 2 Ramp-up Time
Range: Function:
Size
related*
[ 0.01 -
3600 s]
Enter the ramp-up time, i.e. the acceleration
time from 0 RPM to the rated motor speed
n
s
. Choose a ramp-up time such that the
output current does not exceed the current
limit in parameter 4-18 Current Limit during
ramping. The value 0.00 corresponds to 0.01
s in speed mode. See ramp-down time in
parameter 3-52 Ramp 2 Ramp-down Time.
Par . 3 − 51 =
t
acc
s xn
s
RPM
ref RPM
3-52 Ramp 2 Ramp-down Time
Range: Function:
Size
related*
[ 0.01
- 3600
s]
Enter the ramp-down time, i.e. the
deceleration time from the rated motor
speed n
s
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
parameter 4-18 Current Limit. The value 0.00
3-52 Ramp 2 Ramp-down Time
Range: Function:
corresponds to 0.01 s in speed mode. See
ramp-up time in parameter 3-51 Ramp 2
Ramp-up Time.
Par . 3 − 52 =
t
dec
s xn
s
RPM
ref RPM
3-60 Ramp 3 Type
Option: Function:
Select the ramp type, depending on
requirements for acceleration and deceleration. A
linear ramp will give constant acceleration during
ramping. An S-ramp will give non-linear
acceleration, compensating for jerk in the
application.
[0] Linear
[1] S-ramp
Const Jerk
Accelerates with lowest possible jerk.
[2] S-ramp
Const
Time
S-ramp based on the values set in
parameter 3-61 Ramp 3 Ramp-up Time and
parameter 3-62 Ramp 3 Ramp-down Time
NOTICE!
If [1] S-ramp Const Jerk is selected and the reference
during ramping is changed the ramp time may be
prolonged in order to realize a jerk free movement
which may result in a longer start or stop time.
Additional adjustment of the S-ramp ratios or switching
initiators may be necessary.
3-61 Ramp 3 Ramp-up Time
Range: Function:
Size
related*
[ 0.01 -
3600 s]
Enter the ramp-up time, i.e. the acceleration
time from 0 RPM to the rated motor speed
n
s
. Choose a ramp-up time such that the
output current does not exceed the current
limit in parameter 4-18 Current Limit during
ramping. The value 0.00 corresponds to 0.01
s in speed mode. See ramp-down time in
parameter 3-62 Ramp 3 Ramp-down Time.
3-62 Ramp 3 Ramp-down Time
Range: Function:
Size
related*
[ 0.01
- 3600
s]
Enter the ramp-down time, i.e. the
deceleration time from the rated motor
speed n
s
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
parameter 4-18 Current Limit. The value 0.00
Parameter Descriptions
VLT
®
Compressor Drives CDS 302/CDS 303
56 Danfoss A/S © Rev. 2013-07-03 All rights reserved. MG34M422
6
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