Danfoss VLT AQUA FC 202 User Manual

3-41 Ramp 1 Ramp Up Time
Range: Function:
Size
related*
[ 0.10 -
3600 s]
Enter the ramp-up time, i.e. 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.
par .3 − 41 =
tacc × nnom par .1 − 25
ref rpm
s
3-42 Ramp 1 Ramp Down Time
Range: Function:
Size
related*
[ 0.10 -
3600 s]
Enter the ramp-down time, i.e. the
deceleration time from
parameter 1-25 Motor Nominal Speed to 0
RPM. Select a ramp-down time such that no
over-voltage arises in the inverter due to
regenerative operation of the motor, and
such that the generated current does not
exceed the current limit set in 4-18 Current
Limit. See ramp-up time in
parameter 3-41 Ramp 1 Ramp Up Time.
par .3 − 42 =
tdec × nnom par .1 − 25
ref rpm
s
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 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 5.13.
130BA962.10
Motor Speed
Motor Speed
High
Low
Normal
Ramps
Initial
Ramp
Final
Ramp
Time
Speed
Illustration 5.13 Initial and Final Ramp Time
3-85 Check Valve Ramp Time
Range: Function:
0 s* [0 -
60 s]
In order 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 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
seconds, the Check Valve Ramp Time is effectuated
and will be 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 5.14.
130BA961.10
Speed
Motor Speed
Normal
Check valve
Motor Speed
High
Low
Time
Ramp
End Speed
Illustration 5.14 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 and
the Check Valve should no longer
be active.
130BA961.10
Speed
Motor Speed
Normal
Check valve
Motor Speed
High
Low
Time
Ramp
End Speed
Illustration 5.15
How to programme the freque... VLT AQUA Drive FC 202 Operation Instructions
MG20P402 - Rev. 2013-12-16 91
5 5

Danfoss VLT AQUA FC 202 Specifications

General

Brand	Danfoss
Model	VLT AQUA FC 202
Category	DC Drives
Language	English