Danfoss VLT Midi Drive FC 280, Design Manual

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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
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.
M
3
96 97 99 98
91 92 93 95
50
12
L1 L2
L1
PE L3
W PE V U
F1
L2
L3
N
PE
18
53
27
55
32
33
24 Vdc
130BD372.11
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 Parameter number Setting
1) Make sure that the motor runs properly. Do the following:
Set the motor parameters using the data on the
nameplate.
1-2* Motor Data As specified by motor nameplate.
Perform an AMA. Parameter 1-29 Automatic
Motor Adaption (AMA) [1] Enable complete 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).
Set a positive reference.
3) Make sure that the frequency converter limits are set to safe values:
Set acceptable limits for the references.
Parameter 3-02 Minimum
Reference 0
Parameter 3-03 Maximum
Reference 50
Check that the ramp settings are within frequency
converter capabilities and allowed application operating
specifications. Parameter 3-41 Ramp 1
Ramp Up Time Default setting
Parameter 3-42 Ramp 1
Ramp Down Time Default setting
Product Overview
VLT
®
Midi Drive FC 280
28 Danfoss A/S © 03/2016 All rights reserved. MG07B102
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