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30072-452-92
01/2010
Altivar® 71 Programming Guide
[1.4 MOTOR CONTROL] (drC-)
Selecting the encoder
Follow the recommendations in the catalog and the Installation Manual.
NOTE: When an encoder is used with a VW3 A3 408 or VW3 A3 409 card, it is only possible to configure the "encoder" input for
speed feedback. Functions can only be configured as references or inputs with a VW3 A3 401 to 407 and VW3 A3 411 card.
When an encoder is used with a VW3 A3 409 card, the drive remains locked in stop mode (and displays nSt) if the encoder is not
fully configured.
Encoder check procedure
This procedure applies to all types of encoder.
1. Configure the parameters of the encoder used, pages 117 to 120.
2. Set [Motor control type] (Ctt) to a value other than [FVC] (FUC) and [Sync.CL] (FSY), even if it is the required configuration. For
example, use [SVC V] (UUC) for an asynchronous motor and [Sync. mot.] (SYn) for a synchronous motor.
3. Configure the motor parameters in accordance with the specifications on the rating plate.
• Asynchronous motor (see page 79): [Rated motor power] (nPr), [Rated motor volt.] (UnS), [Rated mot. current] (nCr), 
[Rated motor freq.] (FrS), [Rated motor speed] (nSP).
• Synchronous motor (see page 83): [Nominal I sync] (nCrS), [Nom motor spdsync] (nSPS), [Pole pairs.] (PPnS), 
[Syn. EMF constant] (PHS), [Autotune L d-axis] (LdS), [IAutotune L q-axis] (LqS), [Cust. stator R syn] (rSAS). 
[Current Limitation] (CLI) must not exceed the maximum motor current, otherwise demagnetization may occur.
4.
5.
6.
7.
8.
Set [Encoder usage] (EnU) = [No] (nO).
Perform auto-tuning.
Set [Encoder check] (EnC) = [Yes] (YES).
Verify motor rotation.
Run the motor at approximately 15% of the rated speed for at least 3 seconds, and use the [1.2-MONITORING] (SUP-) menu to
monitor its behavior.
9. If it trips on an [Encoder fault] (EnF), [Encoder check] (EnC) returns to [No] (nO).
- Check the parameter settings and perform auto-tuning again (see steps 1 to 5 above).
- Check that the mechanical and electrical operation of the encoder, its power supply and connections are all OK.
- Reverse the direction of rotation of the motor ([Output Ph rotation] (PHr) parameter page 75) or the encoder signals.
10. Repeat the operations from step 6 onwards until [Encoder check] (EnC) changes to [Done] (dOnE).
11. If necessary, change [Motor control type] (Ctt) to [FVC] (FUC) or [Sync.CL] (FSY). In the case of [Sync.CL] (FSY), go on to perform the
"Procedure for measuring the phase-shift angle between the motor and the encoder" on page 85.
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