Danfoss VLT AQUA Drive FC 202 Programming Manual page 72

Parameter Description
3.5.5 3-8* Other Ramps
3-80 Jog Ramp Time
Range:
Size [0.1 -
3 3
related 3600 s]
*
RPM
P 4-13 RPM
high limit
P 1-25
Motor speed
P 3-19
Jog speed
P 4-11 RPM
low limit
Illustration 3.22 Jog Ramp Time
3-84 Initial Ramp Time
Range:
0 s [0 - Enter the initial ramp-up time from zero speed to
*
60 s] 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.
70
Function:
Enter the jog ramp time, that is the
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
s
jog speed par . 3 − 19
t jog t jog
P 3-80 P 3-80
Ramp up
Ramp down
(acc) (dec)
Function:
Danfoss A/S © 05/2018 All rights reserved.
®
VLT AQUA Drive FC 202
Motor Speed
High
Motor Speed
Low
) (set in
M,N
Illustration 3.23 Initial and Final Ramp Time
3-85 Check Valve Ramp Time
Range:
0 s [0 -
*
650 s]
Time
Motor Speed
High
Motor Speed
Low
Illustration 3.24 Check Valve Ramp
3-86 Check Valve Ramp End Speed [RPM]
Range:
Size related
3-87 Check Valve Ramp End Speed [HZ]
Range:
Size related
Speed
Normal
Ramps
Initial
Ramp
Function:
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
different from 0 s, the check valve ramp time is
effectuated 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.
Speed
Check valve
End Speed
Function:
[ 0 - par. Set the speed in [RPM] below motor
*
4-11 RPM] speed low limit where the check
valve is expected to be closed. Check
that the valve is no longer active. See
Illustration 3.24.
Function:
[ 0 - par. Set the speed in [Hz] below motor
*
4-12 Hz] speed low limit where the check
Final
Ramp
Time
Normal
Ramp
Time
MG20OB02