Unit Description
38
Overload Relay—Manual Reset (Model 50): An
overload relay protects the standby electric motor. The
overload relay opens the circuit to the electric motor if the
motor overloads for any reason (e.g., low line voltage or
improper power supply) while the unit is on electric standby
operation. The microprocessor will record Alarm Code 90.
Press the reset button on the high voltage tray to reset the
overload relay. The high voltage tray is located behind the
lower access panel on the compressor side of the unit.
Smart FETs: Smart FETs in the controller interface board
protect some circuits and components from an overcurrent
condition.
Fuses: A number of fuses, located on the interface board,
protect various circuits and components. The interface board is
located inside the control box. Refer to the appropriate
Microprocessor Controller Diagnostic Manual for more
information about the fuses.
Fuse Size Function
F2 15A 2AB Power
F3 40A Fuel Sol Pull-In/Starter Circuit
F4
None
2A
No Fuse - All Bosch and Thermo King
Alternators
2A Fuse - All Prestolite Alternators
F5 60A Preheat Circuit
F6 15A Damper and High Speed Circuits
F7 2A
8XP Circuit - Controller On Feedback to
HMI
F8 5A CAN Connector J12
F9 5A CAN Connector J14
F10 10A 8X Power (Install fuse in upper position)
F11 10A Power to LLS1 (Not Used)
F12 5A CAN Connector J13
F13 2A 8FC Circuit (Remote Lights)
F15 P/S On/Off Relay
F20 2A Alternator Sense
F22 Not Used
F23 Not Used
Fuse Size Function
Unit Description
38
Overload Relay—Manual Reset (Model 50): An
overload relay protects the standby electric motor. The
overload relay opens the circuit to the electric motor if the
motor overloads for any reason (e.g., low line voltage or
improper power supply) while the unit is on electric standby
operation. The microprocessor will record Alarm Code 90.
Press the reset button on the high voltage tray to reset the
overload relay. The high voltage tray is located behind the
lower access panel on the compressor side of the unit.
Smart FETs: Smart FETs in the controller interface board
protect some circuits and components from an overcurrent
condition.
Fuses: A number of fuses, located on the interface board,
protect various circuits and components. The interface board is
located inside the control box. Refer to the appropriate
Microprocessor Controller Diagnostic Manual for more
information about the fuses.
Fuse Size Function
F2 15A 2AB Power
F3 40A Fuel Sol Pull-In/Starter Circuit
F4
None
2A
No Fuse - All Bosch and Thermo King
Alternators
2A Fuse - All Prestolite Alternators
F5 60A Preheat Circuit
F6 15A Damper and High Speed Circuits
F7 2A
8XP Circuit - Controller On Feedback to
HMI
F8 5A CAN Connector J12
F9 5A CAN Connector J14
F10 10A 8X Power (Install fuse in upper position)
F11 10A Power to LLS1 (Not Used)
F12 5A CAN Connector J13
F13 2A 8FC Circuit (Remote Lights)
F15 P/S On/Off Relay
F20 2A Alternator Sense
F22 Not Used
F23 Not Used
Fuse Size Function
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