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7:10
Power Unit Checks
DANGER
THIS EQUIPMENT IS AT LINE
VOLTAGE WHEN A-C POW-
ER IS CONNECTED TO THE
CONTROLLER. WHENEVER
POWER IS REMOVED,
VERIFY WITH A VOLTMETER
AT FACEPLATE TERMINAL
147(+) AND REGULATOR
BOARD TERMINAL B1(–)
THAT THE D-C BUS CAPACI-
TORS ARE DISCHARGED
BEFORE TOUCHING ANY IN-
TERNAL PARTS OF THE
CONTROLLER. FAILURE TO
OBSERVE THIS PRECAU-
TION COULD RESULT IN SE-
VERE BODILY INJURY OR
LOSS OF LIFE.
1.
Turn input power OFF. After
verifying the D-C bus voltage
is zero VDC and the POWER
LED is not illuminated,
disconnect the motor from the
controller.
2.
With a volt-ohmmeter on a
known diode, determine the
meter polarity as shown in
Figure 7-6. The meter reading
should be a low ohm reading.
3.
Set a volt-ohmmeter on the x1
ohmmeter scale and measure
from the transistor collector (+)
to the emitter (–) using the
terminals defined in Table 7-2.
4.
Connect the positive lead
determined in Step 2 to the (+)
terminal indicated in Table 7-2.
Connect the negative lead to
the (–) terminal indicated in
Table 7-2. Refer to Figure 7-7
for transistor terminal details.
The transistors should all read
very high resistance.
5.
With input power removed and
the motor disconnected from
the controller, remove all
transistor connections. When
removing the transistor
connections, mark the
connectors for quick
reconnection after the test.
Figure 7-6.
Polarity Check at Diode.
Figure 7-7.
Transistor Terminals.
Table 7-2. Transistor Terminals from Which To Take Readings.
(+) Terminals
(–) Terminals
Transistor
Number
Location
Terminal
Location
Terminal
1
147
601 (U)
3
147
602 (V)
5
147
603 (W)
2
601 (U)
145
4
602 (V)
145
6
603 (W)
145
Plus D-C Bus
on Faceplate
Terminal Block
Faceplate
Terminal
Block
Minus D-C
Bus
on Regulator
Faceplate
Terminal
Block
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