I.B. 48008
Page 11
Effective 11/97
Static Field Test
Verify the field supply output without energizing the motor
as follows:
1.
Install contactor and all fuses.
2.
Connect the motor field leads to terminals F1 and F2.
3.
Disconnect the motor stator leads from the starter
load terminals and isolate them from ground, each
other, and any live parts.
4.
Close and latch all enclosure doors except that
necessary to monitor voltage at F1 to F2, have
access to potentiometer P1 on CB (See Figure 6) and
read field current on the panel ammeter provided.
5.
Notify personnel that the motor field is about to be
energized.
6.
With power available on the Ampgard bus system,
close the controller isolating switch and close the line
contactor (M).
7.
Plan to keep the motor field energized with the
motor still for not more than two minutes! Motor
field windings may be damaged if energized for
more than two minutes with motor not rotating.
8.
Since there is no induced AC voltage on the motor
rotor a DC field voltage will appear at terminals F1-F2
as the motor field is energized. With potentiometer P2
at full counter clockwise (CCW) position, adjust
potentiometer P1 to give 50% of nameplate field
voltage as measured at F1-F2. With P1 set, adjust P2
to obtain full-load field current as read on the panel
meter.
Full Operation
1.
Open isolating switch.
2.
Reconnect motor leads.
3.
Close and latch all doors.
4.
Close isolating switch.
5.
Start motor.
