PROCESS DESCRIPTION
Gentherm Global Power Technologies
Page 13
4.1.2
Spark Ignition Control System
The Ignition Control System consists of the following parts:
•
Spark electrode
•
Pressure switch
•
Ignition control module (SI)
•
Solenoid valve
•
SI Power Supply
•
Battery pack
When the manual ball valve is opened, fuel pressure causes the pressure switch (located in
the fuel system) to close. The pressure switch is connected to the SI Controller’s ignition
request input. If the optional TEG Controller board is installed, the pressure switch is
connected to it instead of directly to the SI Controller board. The TEG Controller board sends
the ignition request to the SI Controller board when the TEG is to be started. This causes the
SI Controller board to power the SI module, indicated by the SI power indicator being on.
When the SI module is powered and in combination with the absence of flame sensed at the
spark electrode, the ignition control module (SI) generates sparks from the electrode to the
combustion chamber plate, as well as opens the solenoid valve allowing gas to flow into the
burner chamber, causing ignition to occur. Once combustion is detected, the SI will stop
sparking and the SI will continue to monitor the presence of flame at the electrode. If the SI
did not detect combustion for a period of 7 seconds, it will stop sparking and close the
solenoid valve, wait for a 10 second purge period and then make another attempt at ignition.
The SI will attempt 3 ignition trials and if flame detection cannot be maintained, the SI will
go into Lockout mode. The Lockout light on the SI Controller board will turn on and the SI
will be powered down. The SI Controller board will have to be reset for another attempt at
ignition, resetting the SI Controller board. The SI Controller board consumes more power
when it is locked out than when it is waiting to start.
NOTE:
The certified Ignition Control Module (SI) is responsible for the ignition
sequence and control of the fuel valve and spark generation.
NOTE:
The combustion control system contains a single 6V, 5.0 amp-hour monobloc
rechargeable battery and a constant potential battery charger. A new fully
charged battery provides approximately 120 minutes of operating time at
25ºC. The SI Controller switches from battery voltage to generator power unit
voltage after the output voltage exceeds 10 VDC. Completely discharged
batteries will take approximately 20 hours TEG operation to regain 100%
charge as long as the output load is not overloading the TEG.
Summary of Contents for P-5100
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