Danfoss VLT AQUA Drive FC 202 Design Manual page 206

Application Examples
The special CAN motor is used because of the wet instal-
lation conditions. Design 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. Most submersible
pump manufacturers recommend that the pump ramps to
minimum speed (30 Hz) in maximum 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 2
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 does the opposite from minimum
speed to stop in a stop situation. Consider also enabling
advanced minimum speed monitoring as described in
chapter 5.9 Advanced Minimum Speed Monitoring Overview.
To achieve extra pump protection, use the dry-run
detection function. For more information, see the
programming guide.
Pipe-fill mode can be enabled to prevent water
hammering. The Danfoss drive can fill the vertical pipes
using the PID controller to ramp up the pressure slowly
with a user-specified rate (units/second). If enabled, the
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 setpoint, where the drive
12 12
automatically disables pipe fill mode and continues in
normal closed-loop operation.
Electrical Wiring
Figure 12.4 Wiring for Submersible Pump Application
NOTICE!
Set the analog input 2, (terminal 54) format to mA.
(switch 202).
204
®
VLT AQUA Drive FC 202
Parameter settings
Parameter
Parameter 1-20 Motor Power [kW]/parameter 1-21 Motor Power
[HP]
Parameter 1-22 Motor Voltage
Parameter 1-24 Motor Current
Parameter 1-28 Motor Rotation Check
Ensure that parameter 1-29 Automatic Motor Adaptation (AMA) is
set to [2] Enable Reduced AMA.
®
Table 12.14 Relevant Parameters for Submersible Pump
Application
Parameter
Parameter 3-02 Minimum
Reference
Parameter 3-03 Maximum
Reference
Parameter 3-84 Initial Ramp Time (2 s)
Parameter 3-88 Final Ramp Time
Parameter 3-41 Ramp 1 Ramp Up
Time
Parameter 3-42 Ramp 1 Ramp
Down Time
Parameter 4-11 Motor Speed Low
Limit [RPM]
Parameter 4-13 Motor Speed High
Limit [RPM]
Use the Closed-loop wizard under Quick Menu
set up the feedback settings in the PID controller.
Table 12.15 Example of Settings for Submersible Pump
Application
Parameter
Parameter 29-00 Pipe Fill Enable
Parameter 29-04 Pipe Fill Rate
Parameter 29-05 Filled Setpoint
Table 12.16 Example of Settings for Pipe-Fill Mode
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Setting
The minimum reference unit
matches the unit in
parameter 20-12 Reference/
Feedback Unit
The maximum reference unit
matches the unit in
parameter 20-12 Reference/
Feedback Unit
(2 s)
(8 s depending on size)
(8 s depending on size)
(30 Hz)
(50/60 Hz)
⇒ Function Set-up, to
Setting
Disabled
(Feedback units)
(Feedback units)
MG22B222