+MGO-EmPostPurge

+MGO EmPostPurge, Marine Gasoline Oil Emergency Post Purge System

System is designed to ensure post purging in case of Flame failure during burner operation in Emergency mode.

To avoid adding of new control element in Combustion Air damper control loop (4-20 mA from ACC) pneumatic solution is chosen for control during post purging in Emergency operation.

System consists of:

PLC  & relays

PLC is monitoring burner mode of operation (auto/emergency), status of Main oil valves and both Flame scanners.

Pneumatic

Opening of Combustion air damper via solenoid valve V1 to position determined with Press regulator R1.

Valve V1 is spring return and in normal position air from damper I/P positioner is directed to control drive, when V1 energized air adjusted on press regulator R1 is forwarded to control drive.

For bypassing of pneumatic system V2 (control air shutoff) shell be closed and V3 (solenoid bypass) opened. 

PLC (Siemens LOGO 230 RC) is powered from 230 VAC source permanently to avoid PLC start up time at power up (if connected to EMG. Operation power supply, certain time will be necessary for PLC to load program and establish RUN mode).