Diesel Generator Operation Manual System Overview part2

Diesel Generator Operation Manual

System Overview part 2

2 .Heaters

2.1   Heater Supply and Isolation

A heater supply is required for the operation of the engine and alternator heaters. See Section 1.1.1.

A separate disconnecting device is required by BS EN 12601:2001.

Note:   This disconnecting device is not provided as part of the generator set.

Note:   It is the sole responsibility of the customer to provide the power supply and the means  to isolate the AC input to the terminal box. Cummins Power Generation Limited accepts no responsibility for providing the means of isolation.

2.2   Engine Heater (Option)

The engine heater is designed to keep the engine coolant warm when the engine is shut down. It heats and circulates the coolant within the engine, reducing start-up time and engine wear caused by cold starts. The heater is controlled by an associated thermostat, but is locked out at engine start.

2.3   Alternator Heater (Option)

The alternator heater is designed to keep the alternator free of condensation when the generator set is not running. During cool and humid conditions, condensation can form within the alternator, which can result in insulation degradation, leading to failure, and a possible shock hazard. The heater is locked out at engine start.

2.4   Control Panel Heater (Option)

The control panel heater provides a means of humidity/temperature control within the control box interior. It protects the components and ensures their effectiveness when the generator set is subjected to varying ambient air conditions during extended periods of non-use. The heater is locked out at engine start.

3.   Mains Powered Battery Charger (Option)

3.1   Operation

This unit maintains the battery in a fully charged condition without over-charging. The unit also provides rapid charging, when necessary, at a current up to the rated output.

The charger’s electronic control circuit allows the charger to be left in circuit during engine cranking and to operate in parallel with the charge alternator.

The charger will supply current to the battery system when the battery terminal voltage is equal to the set float voltage, at which point only a trickle charge current is present. When the battery becomes discharged due to a load being present and the terminal voltage falls, the charger will again supply current to restore the voltage of the battery to the float voltage.

Should a charge fail condition occur for longer than ten seconds then the charge fail relay will energise, and its contact close. Charger operation is indicated by a red LED.

Note:The LED will light even if the charger output fuse is blown.

3.2   Boost Charge (Option)

During trickle charging, not all cells in the battery receive the same charge and over a period of several months this may affect battery performance. It is therefore normal to give batteries a regular charge at their full rate to return all cells to full capacity. This is referred to as Boost Charging (also known as equalise charging).

If the charger is fitted with a Boost Charge switch, the Boost position should be selected at intervals detailed by the battery manufacturer (normally around every six months).