Danfoss VLT AQUA Drive FC 202

3.5.5 3-8* Other Ramps
3-80 Jog Ramp Time
Range: Function:
Size
related*
[0.1 -
3600 s]
Enter the jog ramp time, that is the
acceleration/deceleration time between 0 RPM
and the nominal motor speed (n
M,N
) (set in
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
 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
Illustration 3.22 Jog Ramp Time
3-84 Initial Ramp Time
Range: Function:
0 s* [0 -
60 s]
Enter the initial ramp-up time from zero speed to
motor speed low limit, parameter 4-11 Motor Speed
Low Limit [RPM] or parameter 4-12 Motor Speed Low
Limit [Hz]. Submersible deep-well pumps can be
damaged by running below minimum speed. A fast
ramp time below minimum pump speed is
recommended. This parameter may be applied as a
fast ramp rate from zero speed to motor speed low
limit. See Illustration 3.23.
130BA962.10
Motor Speed
Motor Speed
High
Low
Normal
Ramps
Initial
Ramp
Final
Ramp
Time
Speed
Illustration 3.23 Initial and Final Ramp Time
3-85 Check Valve Ramp Time
Range: Function:
0 s* [0 -
650 s]
To protect ball check valves in a stop situation, the
check valve ramp can be utilized as a slow ramp
rate from parameter 4-11 Motor Speed Low Limit
[RPM] or parameter 4-12 Motor Speed Low Limit [Hz]
to check valve ramp end speed, set in
parameter 3-86 Check Valve Ramp End Speed [RPM]
or parameter 3-87 Check Valve Ramp End Speed [HZ].
When parameter 3-85 Check Valve Ramp Time is
dierent from 0 s, the check valve ramp time is
eectuated and is used to ramp down the speed
from motor speed low limit to the check valve end
speed in parameter 3-86 Check Valve Ramp End
Speed [RPM] or parameter 3-87 Check Valve Ramp
End Speed [HZ]. See Illustration 3.24.
130BA961.10
Speed
Motor Speed
Normal
Check valve
Motor Speed
High
Low
Time
Ramp
End Speed
Illustration 3.24 Check Valve Ramp
3-86 Check Valve Ramp End Speed [RPM]
Range: Function:
Size related* [ 0 - par.
4-11 RPM]
Set the speed in [RPM] below motor
speed low limit where the check
valve is expected to be closed. Check
that the valve is no longer active. See
Illustration 3.24.
3-87 Check Valve Ramp End Speed [HZ]
Range: Function:
Size related* [ 0 - par.
4-12 Hz]
Set the speed in [Hz] below motor
speed low limit where the check
Parameter Description
VLT
®
AQUA Drive FC 202
70 Danfoss A/S © 05/2018 All rights reserved. MG20OB02
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