Magnetek Elevator Quattro DC - Initial Adjustments after Power up

Quattro DC Startup Guide
22
Initial adjustments after power up
Encoder Set-up
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.
IMPORTANT
Proper encoder speed feedback is essential
for a drive to provide proper motor control.
Electrical Requirements:
 Insulate both the encoder case and shaft
from the motor
 Incremental encoder type
 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 (300Khz @ rated
motor speed maximum)
 Use the proper encoder supply voltage
and use the highest possible voltage
available. The Quattro DC provides both
5VDC and 12VDC. Magnetek
recommends using the 12VDC for the
encoder supply.
Mechanical Considerations:
 Use direct motor mounting without
couplings
 Use hub or hollow shaft encoder with
concentric motor stub shaft
 If possible, use a mechanical protective
cover for exposed encoders
 It is not advisable to use friction wheels
Enter / Verify the encoder pulses entered in
the ENCODER PULSES (A1) parameter
matches the encoder’s nameplate.
Motor Parameter Set-up
Enter / Verify the following from the motor’s
nameplate:
1. Motor Current (RATED MTR CURRENT
(A6))
2. Motor Voltage (RATED ARM VOLTS (A6))
3. Motor field amps, forcing (FULL FLD
AMPS (A6))
4. Motor field amps, running (WEAK FLD
AMPS (A6))
5. Motor field amps, standing (STNDBY
FIELD (A6))