Electrical Diagnostics - Westpro Westinghouse WH3250 Series Service Manual

TROUBLESHOOTING

ELECTRICAL DIAGNOSTICS

Resolve Overload Problem to Ensure Safe Operation
After Electrical Load Resolved Push to Reset Breaker
Check for T ripped Duplex Circuit Breaker(s)
Resolve Overload Problem to Ensure Safe Operation
After Electrical Load Resolved Wait Several Minutes
(for Thermal Breaker to Cool) Push to Reset Breaker
(see Manual Section "Governor Adjustment")
If Voltage Out of Range, Perform "240V Circuit Check"
Check Voltage Output at NEMA 5-20R 120V
If Voltage Out of Range, Perform "120V Circuit Check"
Check Voltage Output at NEMA 5-20R 120V
If Voltage Out of Range, Perform "120V Circuit Check"
8-2
General Electrical Check
Check for T ripped Master Breaker
If Cannot Reset, Replace Breaker
Outlets Adjacent the Breaker Indicate
the Excess Load Source
If Cannot Reset, Replace Breaker
Start Engine and Run at No Load
Check Engine Frequency = 61.5 to 63 Hz
Adjust Governor, if necessary
If Frequency Still Out of Range,
see Engine Diagnostics Section
Check Voltage Output at
NEMA L14-30R 240V Receptacle
246-
G
252V
X
Y
123- 123-
W
126V 126V
Duplex Outlet #1
W X
123-
126V
G
Duplex Outlet #2
W Y
123-
126V G
240V Circuit Check
(No Output OR
Voltage Out of Spec)
Conduct This Check Only When Conduct This Check Only When
Directed by General Electrical Check
Directed by General Electrical Check
Remove Alternator End Cover Remove Main Control Panel from
Check Wires and Connections
from AVR to Brush Assembly
for Proper Orientation
for Each Connection (X or Y , W, G)
of Wire Connections
If a Connection is Loose or
Disconnected, Reestablish
a Tight Connection
Check Wires and Connections from
120V Duplex to 240V Receptacle
If a Wire or Connection is Damaged,
Replace AVR
Check Wires and Connections
for the Exciter & AVR T ap
from AVR to Alternator
On AVR Side of Connection:
If a Connection is Loose or
Disconnected, Reestablish a
Tight Connection
If a Wire or Connector is Damaged,
Replace AVR
On Alternator Side of Connection:
If a Connection is Loose or
Disconnected, Reestablish a
Tight Connection
If a Wire or Connector
is Damaged,
Replace Alternator
Check for Continuity from
the 240V Receptacle
for Each Connection (X, Y , W, G) to
Corresponding Alternator T erminal
If Continuity Not Present
in Any Circuit,
Check Wires and Connections
from Receptacle to Alternator
If a Connection is Loose or
Disconnected, Reestablish a Tight
Connection and Recheck Continuity
If a Wire or Connection is Damaged,
Replace Electrical Panel
Check for Continuity in
Each Leg of Master Breaker
from the Line T erminal
to the Load T erminal
If No Continuity ,
Replace Master Circuit Breaker
Check for Continuity in Each Circuit
of the 240V Receptacle
from the Female Socket on the Front
to the T erminal on the Back
If No Continuity ,
Replace Duplex Receptacle
If Continuity Present,
Replace Electrical Panel
Perform "Alternator Check"
Start Engine and Run at No Load
Check Output Voltage (X to Y) of the
240V Receptacle = 246-252V
If Voltage Still Out of Range
Replace Voltage Regulator
Figure 8-1
120V Circuit Check
(No Output OR
Voltage Out of Spec)
Control Panel Assembly
Check Continuity from the
120V Duplex Receptacle
to the 240V Receptacle
If Continuity Not Present
in Any Circuit,
If a Connection is Loose or
Disconnected, Reestablish a
Tight Connection and Recheck
Continuity
If a Wire or Connection
is Damaged,
Replace Electrical Panel
Check for Continuity in
Duplex Breaker
from the Line T erminal
to the Load T erminal
If No Continuity ,
Replace Duplex Circuit Breaker
Check for Continuity in
Each Circuit of the
120V Duplex Receptacle from
the Female Socket on the Front
to the T erminal on the Back
If No Continuity ,
Replace Duplex Receptacle
If Continuity Present,
Replace Electrical Panel