E. Preglow System With Ready-For-Starting Lamp (Model 123.1)
Operation of Preglow SystemE. Preglow system with ready-for-starting lamp engine 615,616 in model 123.1
Operation
The preglow system is switched on by pulling preglow starter switch into position I. The ready-for-starting condition of engine is indicated by an indicator lamp in instrument cluster. The glow plugs are connected in series and protected by a 50 amps fuse.
The preglow current of approx 55 amps is determined by the firm resistors of the glow plugs, as well as the resistance conductors.
The reason for an excessively high glow current is a ground connection or short-circuit in the preglow system, e.g. a defective glow plug.
The reason for a too low glow current is a transfer resistance, e.g. a loose plug connection or an insufficiently charged battery.
The preglowing time is indicated in dependence of the ambient temperature and the engine temperature by a preglow indicator lamp in instrument cluster.
In preglow position and in starting position (I and II) of preglow starter switch the preglow indicator lamp is contacted with plus by means of a reed contact connected in parallel with fuse and closed if adequate glow current is available. The preglow indicator lamp is connected to minus by way of the rest contact in thermo time switch.
At the end of the optimal preglow period the contact in thermo time switch opens. The preglow indicator lamp is extinguished and thereby shows that the engine is ready for starting.