Rockwell Automation 1901 SyncPro - Manual (Page 33)

Setup and Commissioning 4-7
1901-UM020C-EN-P – June 2013
Commissioning 1. Complete and verify that the setup procedures (pages 4-1 to 4-6)
have been completed. This should include verifying that the
parameters programmed into the SyncPro are appropriate for
the motor. See Chapter 5 for further details on programming.
2. Verify that the SyncPro has been wired into the motor starter
circuit as indicated by the wiring diagram.
3. Remove the wire from the Field Contactor Relay (FCR) coil
either at the I/O point (0:3/0) or at the FCR coil itself. Tie back
and insulate the wire so that it cannot accidentally short out to
ground or another electrical point. This will disable the field
contactor so that the starter will not attempt to synchronize.
Important: The contactor must be disabled in this manner
rather than removing the field cables from the contactor. The
discharge path through the discharge resistor must be maintained;
otherwise, a voltage high enough to damage the field insulation
will occur at the open field windings. This is similar to the
effect which occurs if a current transformer secondary winding
is left open circuited.
4. If during the previous setup procedure for the discharge
resistors R F 1 and R F 2, the induced currents were not known,
then the next step would be to bump the motor with the R F 1
and R F 2 resistors disconnected. The method detailed in Allen-
Bradley publication 1900-2.10 for determining the motor data
by measurement using a strip chart recorder should be done at
this time. The R
F 1 and R F 2 resistors should then be set up as
indicated on page 4-3 with the data obtained. It is necessary to
use jumpers at the SyncPro trip output (O:3/1), and the run
output (O:3/6), for the motor bump.
ATTENTION: During the bumping procedure, the
SyncPro does not protect the motor. Monitor the
procedure closely to avoid damage to the motor.
Do not use jumpers at the ESR contact as this will also
eliminate any external protective trips such as line overcurrent,
fault protection, etc. which are still necessary for the bump.
Refer to Figures 4.2 and 4.3 for the jumper placement, and the
points at which to disconnect the wires.
ATTENTION: During synchronization, voltages
that may exceed 1000 volts are present at the R
F
1
and R F 2 resistors. To avoid shock hazard, do not
touch the resistors.