Engine system

1. 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.

2. The engine system according to claim 1 , wherein:

the operation controlling unit comprises a system main portion controlling unit and an engine controlling unit which are provided individually and separately,

the system main portion controlling unit is configured to receive operating power from the system main portion-side power source unit and control operation of the system main portion, and

the engine controlling unit is configured to receive operating power from the engine-side power source unit and control operation of the engine.

3. The engine system according to claim 2 , wherein:

the system main portion controlling unit and the engine controlling unit are configured to be communicable with each other; and

each of the system main portion controlling unit and the engine controlling unit is configured to perform an engine stop process to stop the engine when detecting an error in communication with each other.

4. The engine system according to claim 1 , further comprising a starter transformer configured to step down the commercial power and supply the stepped down commercial power to a starter of the engine, wherein

the engine-side power source unit is configured to generate operating power using the commercial power stepped down by the starter transformer.

5. The engine system according to claim 1 , wherein the engine-side power source unit is configured so that one or more voltage changing units configured to change voltage of operating power are attachable to and detachable from the engine-side power source unit.

6. The engine system according to claim 1 , wherein the system main portion includes a compressor of a heat pump system.

7. The engine system according to claim 6 , wherein the engine is configured to drive the compressor.

8. The engine system according to claim 1 , further comprising an engine controller configured to control operation of a cooling water pump of the engine and an ignition device of the engine, the engine controller configured to receive power from the engine-side power source unit.

9. The engine system according to claim 1 , further comprising a starter transformer configured to receive a commercial power and discharge an operation power, the commercial power different from the operation power.

10. The engine system according to claim 9 , wherein the operation power from the starter transformer is configured to be supplied to a starter of the engine.

11. The engine system according to claim 9 , wherein the starter transformer separate from the engine-side power source unit.

12. The engine system according to claim 9 , wherein the operation power from the starter transformer is configured to be supplied to the engine-side power source unit.

13. The engine system according to claim 9 , wherein the commercial power corresponds to an alternating current power and the operation power corresponds to a direct current power.

14. The engine system according to claim 1 , wherein the system main portion-side power source unit includes a transformer configured to receive a commercial power and discharge an operation power, the commercial power different from the operation power.

15. The engine system according to claim 14 , wherein the commercial power corresponds to an alternating current power and the operation power corresponds to a direct current power.

16. The engine system according to claim 1 , wherein the operation controlling unit is configured to perform the fuel shutoff process in response to detection of an error in communication between a system main portion controlling unit and an engine controlling unit.

17. The engine system according to claim 16 , wherein the operation controlling unit comprises a system main portion controlling unit and an engine controlling unit which are provided individually and separately.

18. The engine system according to claim 17 , wherein:

the system main portion controlling unit is configured to receive operating power from the system main portion-side power source unit and control operation of the system main portion; and

the engine controlling unit is configured to receive operating power from the engine-side power source unit and control operation of the engine.

19. The engine system according to claim 16 , further comprising a starter transformer configured to step down the commercial power and supply the stepped down commercial power to a starter of the engine.

20. The engine system according to claim 1 , further comprising a starter transformer configured to step down the commercial power and supply the stepped down commercial power to a starter of the engine.