Danfoss VLT Midi Drive FC 280 Design Manual page 30

Product Overview
Example of programming the speed control
In this example, the speed PID control is used to maintain a constant motor speed regardless of the changing load on the
2 2 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. A switch connected to terminal 18 controls starting and stopping. 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. The pulse frequency range to terminals
32 and 33 is 4 Hz–32 kHz.
L1
L2
L3
N
PE
F1
91 92 93 95
L1 L2 L3
U V W PE
96 97 98
M
3
Illustration 2.21 Speed Control Programming
Follow the steps in Table 2.7 to program the speed control (see explanation of settings in the programming guide)
In Table 2.7, 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 the data on the
nameplate.
Perform an AMA.
2) Check that the motor is running and that the encoder is attached properly. Do the following:
Press [Hand On]. Check that the motor is running and note
the rotation direction (referred to as the positive direction).
3) Make sure that the frequency converter limits are set to safe values:
Set acceptable limits for the references.
Check that the ramp settings are within frequency
converter capabilities and allowed application operating
specifications.
28
12
27
PE
18
50
53
55
32
33
99
24 Vdc
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VLT Midi Drive FC 280
Parameter number
1-2* Motor Data
Parameter 1-29 Automatic
Motor Adaption (AMA)
Parameter 3-02 Minimum
Reference
Parameter 3-03 Maximum
Reference
Parameter 3-41 Ramp 1
Ramp Up Time
Parameter 3-42 Ramp 1
Ramp Down Time
Setting
As specified by motor nameplate.
[1] Enable complete AMA
Set a positive reference.
0
50
Default setting
Default setting
MG07B102