Engine system

An engine system comprising:

• an engine configured to output shaft power by burning fuel,
• a system main portion configured to operate using the shaft power of the engine,
• a fuel shutoff valve capable of shutting off a supply of fuel to the engine,
• an operation controlling unit, wherein the operation controlling unit is configured to be capable of performing a fuel shutoff process to actuate the fuel shutoff valve to stop the engine in control of the operation of the system main portion, and
• a power source unit configured to convert commercial power to operating power and supply the operating power to the operation controlling unit, wherein:
• the power source unit comprises:
• a system main portion-side power source unit configured to supply operating power for controlling operation of the system main portion;
• an engine-side power source unit configured to supply operating power for controlling operation of the engine, and
• the system main portion-side power source unit and the engine-side power source unit being provided in a parallel manner.