Danfoss vlt aqua, Руководство по эксплуатации, Страница: 108 / 197

3-10 Preset Reference
Array [8]
Range: Function:
0.00 %* [-100.00 - 100.00 %] 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
MAX
(par. 3-03
Maximum Reference
, for
closed loop see par. 20-14 Maximum Reference/Feedb. ). When using preset references, select Pre-
set ref. bit 0 / 1 / 2 [16], [17] or [18] for the corresponding digital inputs in parameter group 5-1*
Digital Inputs.
3-41 Ramp 1 Ramp Up Time
Range: Function:
10.00 s* [1.00 - 3600.00 s] 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:
20.00 s* [1.00 - 3600.00 s] 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.
5 How to programme the frequency converter VLT AQUA High Power Operation Instructions
108
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