Danfoss VLT Refrigeration Drive FC 103 Programming Manual page 61

Parameter Description
3-42 Ramp 1 Ramp Down Time
Range: Function:
Size [ 1.00 - Enter the ramp-down time, that is the
related 3600 s] deceleration time from
*
parameter 1-25 Motor Nominal Speed–0 RPM.
Select a ramp-down time preventing
overvoltage from arising in the inverter due
to regenerative operation of the motor. The
ramp-down time should also be long
enough to prevent that the generated
current exceeds the current limit set in
parameter 4-18 Current Limit. See ramp-up
time in parameter 3-41 Ramp 1 Ramp Up
Time.
par . 3 − 42 =
3.5.4 3-5* Ramp 2
To select ramp parameters, see parameter group 3-4* Ramp
1.
3-51 Ramp 2 Ramp Up Time
Range: Function:
Size [ 1.00 - Enter the ramp-up time, that is the
related 3600 s] acceleration time from 0 RPM–
*
parameter 1-25 Motor Nominal Speed. Select
a ramp-up time such that the output
current does not exceed the current limit in
parameter 4-18 Current Limit during
ramping. See ramp-down time in
parameter 3-52 Ramp 2 Ramp Down Time.
tacc × nnom par . 1 − 25
par . 3 − 51 =
3-52 Ramp 2 Ramp Down Time
Range: Function:
Size [ 1.00 - Enter the ramp-down time, that is the
related 3600 s] deceleration time from
*
parameter 1-25 Motor Nominal Speed–0 RPM.
Select a ramp-down time such that no
overvoltage occurs 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. See ramp-up
time in parameter 3-51 Ramp 2 Ramp Up
Time.
tdec × nnom par . 1 − 25
par . 3 − 52 =
MG16H202
Programming Guide
tdec × nnom par . 1 − 25
s
ref RPM
s
ref rpm
s
ref rpm
Danfoss A/S © 05/2016 All rights reserved.
3.5.5 3-8* Other Ramps
Parameters for configuring special ramps.
3-80 Jog Ramp Time
Range: Function:
Size [1 - Enter the jog ramp time, that is the
related 3600 s] acceleration/deceleration time between 0 RPM
*
and the nominal motor speed (n
parameter 1-25 Motor Nominal Speed). Ensure
that the resulting output current required for
the given jog ramp time does not exceed the
current limit in parameter 4-18 Current Limit.
The jog ramp time starts after activating a jog
signal via the control panel, a selected digital
input, or the serial communication port.
par . 3 − 80 =
t jog × nnom par . 1 − 25
jog speed par . 3 − 19
RPM
P 4-13 RPM
high limit
P 1-25
Motor speed
P 3-19
Jog speed
P 4-11 RPM
low limit
t jog
P 3-80
Ramp up
(acc)
Illustration 3.21 Jog Ramp Time
3-81 Quick Stop Ramp Time
Enter the quick stop ramp time. This is the acceleration/
deceleration time between 0 RPM and the rated motor frequency
in parameter 1-25 Motor Nominal Speed. During ramping, the
output current must not exceed the current limit in
parameter 4-18 Current Limit.
Range:
Size related [1 - 3600 s]
*
3-82 Starting Ramp Up Time
Range: Function:
Size [0.01 - The ramp-up time is the acceleration time
related 3600 s] from 0 RPM to the nominal motor speed
*
set in parameter 3-82 Starting Ramp Up
Time when [0] Compressor Torque is active
in parameter 1-03 Torque Characteristics.
) (set in
M,N
s
t jog Time
P 3-80
Ramp down
(dec)
Function:
59
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