Danfoss VLT AQUA High Power Operation Instructions Manual page 108

5 How to programme the frequency converter
3-10 Preset Reference
Array [8]
Range:
0.00 %* [-100.00 - 100.00 %]
5
3-41 Ramp 1 Ramp Up Time
Range:
10.00 s* [1.00 - 3600.00 s]
3-42 Ramp 1 Ramp Down Time
Range:
20.00 s* [1.00 - 3600.00 s]
3-84 Initial Ramp Time
Range:
0 s* [0 – 60 s]
108
Function:
Enter up to eight different preset references (0-7) in this parameter, using array programming. The
preset reference is stated as a percentage of the value Ref
Maximum Reference/Feedb.
closed loop see par. 20-14
set ref. bit 0 / 1 / 2 [16], [17] or [18] for the corresponding digital inputs in parameter group 5-1*
Digital Inputs.
Function:
Enter the ramp-up time, i.e. the acceleration time from 0 RPM to par. 1-25
Choose a ramp-up time such that the output current does not exceed the current limit in par.
Current Limit
4-18 during ramping. See ramp-down time in par. 3-42
tacc nnorm par
× .1 − 25
par
.3 − 41 =
ref rpm
Function:
Enter the ramp-down time, i.e. the deceleration time from par. 1-25
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
Current Limit
in par. 4-18 . See ramp-up time in par. 3-41
tdec nnorm par
× .1 − 25
par
.3 − 42 =
ref rpm
Function:
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.
®
MG.20.P3.02 - VLT is a registered Danfoss trademark
VLT AQUA High Power Operation Instructions
(par. 3-03 Maximum Reference
MAX
). When using preset references, select Pre-
Motor Nominal Speed
Ramp 1 Ramp Down Time
s
Motor Nominal Speed
Ramp 1 Ramp Up Time
s
, for
.
.
to 0 RPM.
.