Danfoss VLT AQUA Drive FC 202 Operating Instructions Manual page 74

How to programme the freque...
Preset 76543210
10101010
11001100
11110000
Illustration 6.12 Preset Reference Scheme
3-41 Ramp 1 Ramp Up Time
6 6
Range:
Size [ 0.10 -
related 3600 s]
*
t ×
acc
par .3 − 41 =
3-42 Ramp 1 Ramp Down Time
Range:
Size [ 0.10 -
related 3600 s]
*
t ×
dec
par .3 − 42 =
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 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 6.13.
72
12 (+24V)
29
[P 5-13=Preset ref. bit 0]
32 [P 5-14=Preset ref. bit 1]
33
[P 5-15=Preset ref. bit 2]
Function:
Enter the ramp-up time, that is, the
acceleration time from 0 RPM to
parameter 1-25 Motor Nominal Speed.
Select a ramp-up time such that the
output current does not exceed the
current limit in 4-18 Current Limit during
ramping. See ramp-down time in
parameter 3-42 Ramp 1 Ramp Down Time.
n par .1 − 25
nom
s
ref RPM
Function:
Enter the ramp-down time, that is, the
deceleration time from
parameter 1-25 Motor Nominal Speed to 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
4-18 Current Limit. See ramp-up time in
parameter 3-41 Ramp 1 Ramp Up Time.
n par .1 − 25
nom
s
ref RPM
Function:
Danfoss A/S © Rev. 06/2014 All rights reserved.
Operating Instructions
Motor Speed
High
Motor Speed
Low
Illustration 6.13 Initial and Final Ramp Time
3-85 Check Valve Ramp Time
Range:
0 s [0 -
*
60 s]
Motor Speed
High
Motor Speed
Low
Illustration 6.14 Check Valve Ramp
3-86 Check Valve Ramp End Speed [RPM]
Range:
Size related
Speed
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 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
3-87 Check Valve Ramp End Speed [HZ]. See
Illustration 6.14.
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 and
the Check Valve should no longer
be active.
Final
Ramp
Time
Normal
Ramp
Time
MG20Y202