Danfoss VLT CDS302 Operating Instructions Manual page 56

Parameter Descriptions
3-71 Ramp 4 Ramp up Time
Range:
Size [ 0.01 -
related 3600.00
*
s]
3-72 Ramp 4 Ramp Down Time
6 6
Range:
Size [ 0.01 -
related 3600.00
*
s]
3-80 Jog Ramp Time
Range:
Size [0.01 -
related 3600.00 s]
*
56
Operating Instructions VLT
Function:
Enter the ramp-up time, i.e. the
acceleration time from 0 RPM to the rated
motor speed n . Choose a ramp-up time
s
such that the output current does not
exceed the current limit in 4-18 Current
Limit during ramping. The value 0.00
corresponds to 0.01 s in speed mode. See
ramp-down time in 3-72 Ramp 4 Ramp
Down Time.
t acc s x n s RPM
Par . 3 − 71 =
ref RPM
Function:
Enter the ramp-down time, i.e. the
deceleration time from the rated motor
speed n to 0 RPM. Choose a ramp-down
s
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 4-18 Current Limit. The value 0.00
corresponds to 0.01 s in speed mode. See
ramp-up time in 3-71 Ramp 4 Ramp up
Time.
t dec s x n s RPM
Par . 3 − 72 =
ref RPM
Function:
Enter the jog ramp time, i.e. the
acceleration/deceleration time between 0
RPM and the rated motor frequency n
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 LCP, a selected digital input, or the
serial communication port. When jog
state is disabled then the normal
ramping times are valid.
®
MG34M302 - VLT is a registered Danfoss trademark/Commercial Compressor
®
CDS302 and CDS303
RPM
P 4-13 RPM
high limit
P 1-25
Motor speed
P 3-19
Jog speed
P 4-11 RPM
low limit
Illustration 6.4
t jog s x n s RPM
Par . 3 − 80 =
Δ jog speed ( par . 3 − 19 ) RPM
3-81 Quick Stop Ramp Time
Range:
Size [0.01 -
related 3600.00 s]
*
.
s
P 4-13 RPM
high limit
Reference
P 1-25
Motor speed
P 4-11 RPM
low limit
Illustration 6.5
t jog t jog Time
P 3-80 P 3-80
Ramp up Ramp down
(acc) (dec)
Function:
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.
RPM
Time
P 3-81
Qramp
Qstop