Honeywell hw400 service manual Electrical Diagnostics ALL Models Except HW3000/L

ELECTRICAL DIAGNOSTICS (ALL MODELS EXCEPT HW3000/L)

8.2 ELECTRICAL DIAGNOSTICS (ALL MODELS EXCEPT HW3000/L)

General Electrical Check

Check for Tripped Master Breaker

Resolve Overload Problem to Ensure Safe Operation

After Electrical Load Resolved Push to Reset Breaker

If Cannot Reset, Replace Breaker

Check for Tripped Duplex Circuit Breaker(s)

Outlets Above the Breaker Indicate

the Excess Load Source

Resolve Overload Problem to Ensure Safe Operation

After Electrical Load Resolved Wait Several Minutes (for Thermal Breaker to Cool) Push to Reset Breaker

If Cannot Reset, Replace Breaker

Start Engine and Run at No Load

Check Engine Frequency = 61.5 to 63 Hz

Adjust Governor, if necessary

(see Manual Section “Governor Adjustment”)

If Frequency Still Out of Range, see Engine Diagnostics Section

Check Voltage Output at

NEMA L14-30R 240V Receptacle

246- G

252V

		X
123-	Y	123-
	W
126V		126V

If Voltage Out of Range, Perform “240V Circuit Check”

Check Voltage Output at NEMA 5-20R 120V

Duplex Outlet #1

W X 123-

126V G

If Voltage Out of Range, Perform “120V Circuit Check”

Check Voltage Output at NEMA 5-20R 120V

Duplex Outlet #2

Y

123-

126V G

If Voltage Out of Range, Perform “120V Circuit Check”

240V Circuit Check

(No Output OR

Voltage Out of Spec)

Conduct This Check Only When

Directed by General Electrical Check

Remove Alternator End Cover

Check Wires and Connections

from AVR to Brush Assembly

for Proper Orientation

of Wire Connections

If a Connection is Loose or Disconnected, Reestablish a Tight Connection

If a Wire or Connection is Damaged,

Replace AVR

Check Wires and Connections

for the Exciter & AVR Tap

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 Terminal

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 Terminal to the Load Terminal

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 Terminal 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

Adjust Voltage Regulator, if Necessary by Turning the Potentiometer on the Rear of the Voltage Regulator

If Voltage Still Out of Range

Replace Voltage Regulator

120V Circuit Check

(No Output OR

Voltage Out of Spec)

Conduct This Check Only When

Directed by General Electrical Check

Remove Main Control Panel from

Control Panel Assembly

Check Continuity from the 120V Duplex Receptacle

for Each Connection (X or Y, W, G) to the 240V Receptacle

If Continuity Not Present

in Any Circuit,

Check Wires and Connections from 120V Duplex to 240V Receptacle

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 Terminal to the Load Terminal

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 Terminal on the Back

If No Continuity,

Replace Duplex Receptacle

If Continuity Present,

Replace Electrical Panel

Refer to Illustrations on Pages 8-7 and 8-9.

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