Rockwell Automation 1901 SyncPro - Manual (Page 34)

4-8 Setup and Commissioning
1901-UM020C-EN-P – June 2013
Commissioning (cont.) NOTE: 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 0:3/0 picks up (which
normally would energize the field contactor) occurs to see if
it appears to be occurring at 95% speed
• 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.
NOTE: 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: To avoid damage to the motor, do
not allow the motor to run without synchronizing
(at 95% speed) for longer than required to perform
this test. Most motors are only capable of running
for about 60 seconds at 95% speed without
synchronizing.
6. After completing the actions in Step 5, if the equipment appears
to be operating in the correct manner, then the leads can be
reconnected to the FCR coil which was removed in Step 3.
7. The motor can now be normally started. Once the motor has
synchronized, a good check is to vary the DC excitation.
Verify that when the DC current to the field is reduced, the
motor power factor becomes more lagging and if increased,
the motor power factor becomes more leading.