Danfoss VLT Decentral Drive FCD 302 Design Manual page 23

Product Overview and Functi...
Example of how to program the speed control
In this case, the speed PID control is used to maintain a constant motor speed regardless of the changing load on the
motor. The required motor speed is set via a potentiometer connected to terminal 53. The speed range is 0–1500 RPM
corresponding to 0–10 V over the potentiometer. Starting and stopping is controlled by a switch connected to terminal 18.
The speed PID monitors the actual RPM of the motor by using a 24 V (HTL) incremental encoder as feedback. The feedback
sensor is an encoder (1024 pulses per revolution) connected to terminals 32 and 33.
L1
L2
L3
N
PE
F1
12
91 92 93 95
37
L1 L2 L3 PE
18
50
53
55
39
20
U V W PE
32
33
96 97 98 99
M
24 Vdc
3
Illustration 2.13 Example - Speed Control Connections
The following must be programmed in the order shown (see explanation of settings in the VLT
301/FC 302 Programming Guide)
In the list, it is assumed that all other parameters and switches remain at their default setting.
Function
1) Make sure that the motor runs properly. Do the following:
Set the motor parameters using nameplate data.
Perform an automatic motor adaptation.
2) Check that the motor is running and that the encoder is attached properly. Do the following:
Press the [Hand On] LCP key. Check that the motor is
running and note in which direction it is turning
(referred to as the positive direction).
Go to parameter 16-20 Motor Angle. Turn the motor
slowly in the positive direction. It must be turned so
slowly (only a few RPM) that it can be determined if the
value in parameter 16-20 Motor Angle is increasing or
decreasing.
If parameter 16-20 Motor Angle is decreasing, then
change the encoder direction in parameter 5-71 Term
32/33 Encoder Direction.
3) Make sure that the frequency converter limits are set to safe values.
MG04H302
Design Guide
Parameter
Parameter group 1-2*
Motor Data
Parameter 1-29 Auto
matic Motor
Adaptation (AMA)
–
Parameter 16-20 Moto
r Angle
Parameter 5-71 Term
32/33 Encoder
Direction
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®
AutomationDrive FC
Setting
As specified on motor nameplate.
[1] Enable complete AMA.
Set a positive reference.
(Read-only parameter) Note: An increasing value
overflows at 65535 and starts again at 0.
[1] Counterclockwise (if parameter 16-20 Motor Angle is
decreasing).
2 2
21