Rockwell Automation 1902 Syncpro II - Manual (Page 35)

Rockwell Automation Publication 1902-IN001B-EN-E - April 2013 37
Setup and Commissioning Chapter 4
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 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 shown in Figure 11
with the data obtained. It is necessary to use jumpers at the SyncPro II trip
output, and the run output, for the motor bump.
The phase angle transducer, as wired from the factory, is set up for the customer
to run his wiring with an ABC line orientation. If this was not observed, the user
has two options. First, the line cables can be moved (switching any two incoming
lines will do) so that ABC now exists (BCA or CAB are also acceptable), OR the
current transformer leads to the transducer can be swapped at the transducer.
5. If the RF1/RF2 connections were removed for step 4, they should now be
reconnected at this point and set to the appropriate tap. The motor may
now be bumped for rotation. Allow the motor to accelerate to rated
subsynchronous speed and monitor the following items at this time.
• The time to accelerate to rated subsynchronous speed
• The point at which the I/O point 0:0/2 picks up (which normally
would energize the field contactor) occurs to see if it appears to be
occurring at 95% speed
• Monitor Power Factor during acceleration. It should be lagging.
• This will also prove that the power factor transducer connection is in
the correct orientation with the incoming current and voltages. If the
polarity is incorrect, switching the C3A and C3B connections should
correct the situation.
The phase angle transducer connections are correct provided that the transducer
power and voltage reference inputs are connected to Line 1 and 2 and the current
reference is Line 3. If the incoming connections into the starter have been made
B-A-C, rather than A-B-C, the polarity will also be incorrect even though the
correct starter lines have been brought to the transducer. In either event, the
correction is the same, reverse the C3A and the C3B current transformer
connections.
ATTENTION: During the jogging procedure, the SyncPro II does not
protect the motor. Monitor the procedure closely to avoid damage to
the motor.
ATTENTION: 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. See
Figure 8 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 Rf1 and Rf2 resistors. To avoid shock hazard, do
not touch the resistors.