Magnetek Elevator HPV1000 AC Technical Manual page 37

Encoder Set-up
Verify the encoder has been selected and installed in accordance with the following:
Electrical interference and mechanical speed modulations are common problems that can result in improper speed
feedback getting to the drive. To help avoid these common problems, the following electrical and mechanical
considerations are suggested.
Note: Proper encoder speed feedback is essential for a drive to provide proper motor control.
Electrical Considerations
• If possible, insulate both the encoder case and shaft from the motor.
• Use twisted pair cable with shield tied to chassis ground at drive end.
• Use limited slew rate differential line drivers.
• Do not allow capacitors from internal encoder electronics to case.
• Do not exceed the operating specification of the encoder/drive.
• Use the proper encoder supply voltage and use the highest possible voltage available. (i.e. 12VDC is preferred because
less susceptible to noise).
Mechanical Considerations
• Use direct motor mounting without couplings where possible.
• Use hub or hollow shaft encoder with concentric motor stub shaft.
• If possible, use a mechanical protective cover for exposed encoders.
Autotune
The autotune can now be performed by navigating to the U9 menu. The drive has several options for autotuning the
motor, however usually the motor will be roped, and so the 'Tune-No Rotate1' (Static) method will be used.
If the ropes are off, and the motor can turn freely, the 'Standard Tune' (Rotating) method can be used.
Navigate to the U9 menu and enter the following information:
• 'Tune-No Rotate1' (TUNING MODE SEL(U9))
• Rated Motor Power in kW (MTR RATED POWER(U9))
• Rated Motor Voltage in V (RATED VOLTS(U9))
• Rated Motor Current in A (RATED CURRENT(U9))
• Rated Motor Frequency in Hz (RATED FREQUENCY (U9))
• Number of Motor Poles (NUMBER OF POLES(U9))
• Rated Motor Speed*. This is after slip, so NOT synchronous speed. (RATED SPEED (U9))
• Encoder Pulses (PG PULSE/REV (U9))
• No Load Current. If this is not stamped on the motor, leave it as the default value (NO-LOAD CURRENT(U9))
*Note: The rated motor rpm must be full load speed. If synchronous speed is given, the motor rated rpm can be estimated by:
– 97.5% of synchronous speed for Nema type B motor design
– 94% of synchronous speed for Nema type D motor design
Table 18 Synchronous/Asynchronous Motor Speeds and Motor Poles Reference for 50Hz
Synchronous Speed
Once the above information has been input, the bottom of the menu will be reached, and the screen will display 'Begin
Autotune?'. You can then give and maintain a test/inspection run in the up direction, and the drive will perform the
autotune as long as the run command is issued. If the drive has control of the motor contactors they will now pull in and
the tune will begin.
During this process the drive will display motor speed and motor current for reference.
Once complete the drive will display "END Tune Successful".
MAGNETEK HPV1000 AC Elevator Drive Technical Manual
Rated Motor Speed (rpm)
1500
1000
750
600
6 Installation Startup and Autotune Guides
1497 - 1195
998 - 797
748 - 598
599 - 478
Number of Motor Poles
4
6
8
10
35