Rockwell Automation 1336T Master/Slave Parallel AC Drv - Manual (Page 30)

1336 FORCE-5.19 – August, 2000
3-12 Startup
3. Set P256 = 2 in the Master drive, and give the Master a start
command. Motor should start rotating at this point. The motor
may sound and feel rough when running below 3 Hz. You may
need to increase the phase rotation frequency ref. (P263) to 4
Hz, and phase rotation current ref. (P262) to 75% to get motor
rotation.
4. If motor rotation is incorrect, switch two motor leads. Record
phase swapping so the slave can be swapped to match the
master connections. If motor rotation is correct (positive) but
the speed feedback (P146) is negative, change the encoder
signal wires at the motor end.
Verify that Parameter 146 (Speed Feedback) is the same on
both Master & Slave drives.
(A) to (B) TB10 7 & 5
(A Not) to (B Not)TB10 6& 4
(B) to (A) TB10 5 & 7
(B Not) to (A Not)TB10 4 & 6
5. With motor turning, and Slave motor leads disconnected, check
that all your motor leads and motor windings have the correct
phasing between the Master and the Slave:
(The motor will induce voltage in the Slave windings, which
should be in phase if wired correctly).
A. Use a voltmeter (Simpson Analog or equivalent) set to DC
volts. Measure between (U-master) and (U-slave) motor
leads. If phasing between Master and Slave is incorrect, a
varying voltage will be present. If phasing is correct, zero
voltage will be present.
B. Repeat this test for (V-master and V-slave).
C. Repeat this test for (W-master and (W-slave).
Stop the motor by stopping the Master drive before stopping the
Slave. Save your newly entered values to EEPROM.
Voltage Phasing Verification - Verify voltage phasing between the
master and slave drives by measuring the motor terminal voltages.
1. Use an oscilliscope to measure the motor terminal voltage on
the master and the slave. Measure the master motor differential
voltage T1 to T2 and the slave motor voltage T11 to T22. Make
sure the polarities between the measurements are the same.
2. Make certain only one set of motor windings are connected
(either master or slave, but not both).
3. Run the master drive phase rotation routine. Verify direction of
motor rotation and sign of velocity feedback.
!
ATTENTION: Motor terminals are at bus potential.
Isolated differential probes are recommended when
taking this measurement. (x100 probes in differential
mode may work).