SERVICE TROUBLESHOOTING
4-14
Manual 0-2728
D. Input PC Board /Input Bridge Rectifier Test
Locate the Input PC Board and check for shorted input
diode.
NOTE
Refer to the Appendix Pages for PC Board Lay-
outs.
Remove AC power and with an ohmmeter set on the di-
ode range make the following checks:
Meter (+)
Meter (-)
Indication
A
(-)
Open
B
(-)
Open
C
(-)
Open
A
(+)
Diode Drop
B
(+)
Diode Drop
C
(+)
Diode Drop
(+)
(-)
Open
The meter should indicate a diode drop in one direction
and an open in the other direction for each check.
If Input Bridge Rectifier diode(s) is shorted, make the fol-
lowing checks with an ohmmeter at the Main Contactor:
M e t e r (+ )
M e t e r (-)
I n d ica t io n
L 1
T 1
O p e n
L 2
T 2
O p e n
L 3
T 3
O p e n
If any test has resistance, then replace the Main Contac-
tor also.
E. Main Contactor (MC1) Test
Reconnect power and observe proper start-up procedure.
Indicator D47 on the Logic PC Board should be ON. If
indicator D47 is OFF there is no voltage to the Power
Supply or an overvoltage condition exists.
If indicator D47 is OFF check L1, L2, and L3 for proper
AC input voltage.
L1
L2
L3
Main Contactor
(MC1)
A-02453
Coil
Wire #59
Coil
Wire #55
Measure voltage on coil of contactor, approximately 115
VAC between wires #55 and #59 (see NOTE).
• If voltage is correct, replace Main Contactor.
• If voltage is incorrect, replace Logic PC Board.
NOTE
The Main Contactor was located in the Base on
earlier units and on the Center Chassis for current
units.
F. Inrush Relay Test
If after approximately 8 seconds, the Inrush Relay does
not engage, measure for 115VAC on wires #68 and #69. If
there is voltage, replace Contactor. If there is no voltage,
measure at Logic Board J17- 4 to J17-8. If there is no volt-
age at the Logic Board, replace Logic Board.
G. Blown Fuse (F1) Test
1. The voltage selector set to the wrong input voltage
will cause F1 to fail.
a. Verify input voltage with Voltage Selector.
2. A shorted or frozen pump/motor will cause F1 to fail.
To check the motor:
a. Replace F1 fuse and unplug J32
b. Turn power on if fuse is okay.
• Check motor connections
• Check voltage to motor connector
Содержание PAK Master 150XL
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