Danfoss VLT AQUA Drive FC 202 Design Manual page 109

Application Examples
The special CAN motor is used due to the wet installation
conditions. The adjustable frequency drive needs to be
designed for the system according to output current to be
able to run the motor at nominal power.
To prevent damage to the thrust bearings of the pump,
and to ensure sufficient motor cooling as quickly as
possible, it is important to ramp the pump from stop to
minimum speed as quick as possible. Well-known manufac-
turers of submersible pumps recommend that the pump is
ramped to min. speed (30 Hz) in max. 2–3 s. The VLT
AQUA Drive FC 202 is designed with initial and final ramp
for these applications. The initial and final ramps are two
individual ramps, where initial ramp, if enabled, ramps the
motor from stop to minimum speed and automatically
switches to normal ramp, when minimum speed is
reached. Final ramp will do the opposite from minimum
speed to stop in a stop situation. Consider also enabling
advanced minimum speed monitoring as described in
chapter 4.2 Selected Application Features.
To achieve additional pump protection, use the dry-run
detection function. Refer to the Programming Guide for
further information.
Pipe-fill mode can be enabled to prevent water
hammering. The Danfoss adjustable frequency drive is
capable of filling vertical pipes using the PID controller to
ramp up the pressure slowly with a user specified rate
(units/second). If enabled, the adjustable frequency drive
enters pipe-fill mode when it reaches minimum speed after
start-up. The pressure is slowly ramped up until it reaches
a user-specified filled set point, where the adjustable
frequency drive automatically disables pipe fill mode and
continues in normal closed-loop operation.
Electrical Wiring
Figure 4.7 Wiring for Submersible Pump Application
MG20N622
Design Guide
NOTICE!
Set the analog input 2, (terminal 54) format to mA.
(switch 202).
Parameter Settings
Parameter
1-20 Motor Power [kW]/1-21 Motor Power [HP]
1-22 Motor Voltage
1-24 Motor Current
®
1-28 Motor Rotation Check
Enable reduced automatic motor adaptation in 1-29 Automatic
Motor Adaptation (AMA)
Table 4.3 Relevant Parameters for Submersible Pump
Application
Parameter
3-02 Minimum Reference
3-03 Maximum Reference
3-84 Initial Ramp Time
3-88 Final Ramp Time
3-41 Ramp 1 Ramp-up Time
3-42 Ramp 1 Ramp-down Time
4-11 Motor Speed Low Limit
[RPM]
4-13 Motor Speed High Limit
[RPM]
Use the Closed-loop wizard under Quick Menu_Function_Set-up, to
easily set up the feedback settings in the PID controller.
Table 4.4 Example of Settings for Submersible Pump
Application
Parameter
29-00 Pipe Fill Enable
29-04 Pipe Fill Rate
29-05 Filled Setpoint
Table 4.5 Example of Settings for Pipe-Fill Mode
Danfoss A/S © 09/2014 All rights reserved.
Setting
The minimum reference unit
matches the unit in
20-12 Reference/Feedback Unit
The maximum reference unit
matches the unit in
20-12 Reference/Feedback Unit
(2 s)
(2 s)
(8 s depending on size)
(8 s depending on size)
(30 Hz)
(50/60 Hz)
Setting
(Feedback units/s)
(Feedback units)
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