Honeywell HW7500E Service Manual - Page 38

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 Y 123- W 123- 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 W 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 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. 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 8-6 www.honeywellgenerators.com Honeywell Portable Electrical Generator Service Manual