Danfoss VLT AQUA Drive FC 202 Programming Manual page 62

Parameter Description
RPM
P 4-13 RPM
high limit
P 1-25
3 3
Motor speed
P 3-19
Jog speed
P 4-11 RPM
low limit
Illustration 3.18 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 3.19.
Speed
Motor Speed
High
Motor Speed
Low
Illustration 3.19 Initial and Final Ramp Time
3-85 Check Valve Ramp Time
Range:
0 s [0 -
*
60 s]
60
t jog t jog
P 3-80 P 3-80
Ramp up Ramp down
(acc) (dec)
Function:
Normal
Ramps
Initial
Ramp
Function:
To protect ball check valves in a stop situation, the
check valve ramp can be utilised 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 by the user in
3-86 Check Valve Ramp End Speed [RPM] or
3-87 Check Valve Ramp End Speed [HZ]. When
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
3-86 Check Valve Ramp End Speed [RPM] or
Danfoss A/S © Rev. 2014-01-21 All rights reserved.
Programming Guide
3-85 Check Valve Ramp Time
Range:
Motor Speed
High
Time
Motor Speed
Illustration 3.20 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
3-88 Final Ramp Time
Range:
Final
Ramp
0 s
*
Time 60 s]
3.5.6 3-9* Digital Pot.Meter
The digital potentiometer function allows the user to
increase or decrease the actual reference by adjusting the
set-up of the digital inputs using the functions INCREASE,
DECREASE or CLEAR. To activate the function, at least one
digital input must be set up to INCREASE or DECREASE.
Function:
3-87 Check Valve Ramp End Speed [HZ]. See
Illustration 3.20.
Speed
Low
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 and
the check valve no longer shall be
active. See Illustration 3.20.
Function:
[ 0 - par. Set the speed in [Hz] below motor
*
4-12 Hz] speed low limit where the check
valve ramp is no longer be active.
See Illustration 3.20.
Function:
[0 - Enter the final ramp time to be used when ramping
down from parameter 4-11 Motor Speed Low Limit
[RPM] or parameter 4-12 Motor Speed Low Limit [Hz],
to zero speed.
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 parameter 4-11 Motor Speed Low Limit [RPM] or
parameter 4-12 Motor Speed Low Limit [Hz] to zero
speed. See Illustration 3.19.
Normal
Ramp
Time
MG20O702