3-41 Ramp 1 Ramp Up Time
Range: Function:
Application
dependent*
[Application dependant] Enter the ramp-up time, i.e. the acceleration time from 0 RPM to par. 1-25
Motor Nominal Speed
.
Choose a ramp-up time such that the output current does not exceed the current limit in
par. 4-18
Current Limit
during ramping. See ramp-down time in par. 3-42
Ramp 1 Ramp Down
Time
.
par
.3 − 41 =
tacc
×
nnorm
par
.1 − 25
ref
rpm
s
3-42 Ramp 1 Ramp Down Time
Range: Function:
Application
dependent*
[Application dependant] Enter the ramp-down time, i.e. the deceleration time from par. 1-25
Motor Nominal Speed
to 0 RPM.
Choose 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 par. 4-18
Current Limit
. See ramp-up time in par. 3-41
Ramp 1 Ramp Up Time
.
par
.3 − 42 =
tdec
×
nnorm
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, par. 4-11 or 4-12. Sub-
mersible 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.
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 par. 4-11
Motor Speed Low Limit [RPM]
or par. 4-12
Motor Speed Low Limit
[Hz]
, to Check Valve Ramp End Speed, set by the user in par. 3-86 or par. 3-87. When par. 3-85 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 par. 3-86 or par. 3-87.
3-86 Check Valve Ramp End Speed [RPM]
Range: Function:
0 [RPM]* [0 – Motor Speed Low Limit [RPM]] Set the speed in [RPM] below Motor Speed Low Limit where the Check Valve is expected to be closed
and the Check Valve no longer shall be active.
VLT AQUA Low Harmonic Drive Operating In-
structions 6 How to Programme the Low Harmonic Drive
MG.20.T1.02 - VLT
®
is a registered Danfoss trademark 97
6
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