Operation
14 Owner’s Manual for Stationary Industrial Generators
3.3 — Additional Components
3.3.1— Main Line Circuit Breaker
A Main Line Circuit Breaker (MLCB) is located on the face of the High Voltage Customer Connections panel, typically
situated to the right of the H-100 Control Panel. The MLCB serves as the means of disconnect at the generator, to dis-
connect it from the Transfer Switch.
3.3.2— Automatic Transfer Switch
A typical automatic transfer switch monitors utility voltage and when that voltage falls outside of specific parameters, it
will initiate the generator start command. As long as the generator control is in the AUTO position, it responds to the
automatic transfer switch start command.
For information about any connected automatic transfer switch, consult the applicable transfer switch owner’s manual.
Connecting this generator to an electrical system normally supplied by an electric utility shall be by
means of a transfer switch (either fully automatic or manual), so as to isolate the electric system from
the utility distribution system when the generator is operating. Failure to isolate the electric system by
these means will result in damage to the generator and may also result in injury or death to utility
workers due to backfeed of electrical energy.
3.3.3— Automatic Battery Charger
One of the following types of battery chargers may be provided:
• 2.5-amp
• 10-amp
The 2.5-amp charger is 12 VDC only. The 10-amp charger is available either as a 12 VDC or 24 VDC, as appropriate
for the engine’s DC system voltage.
Both chargers are fully automatic float types and are fully fuse protected (input and output). They have automatic cur-
rent limiting to reduce risk of overcharging, and have automatic maintenance of charge voltage. Therefore, they can be
connected to the batteries continuously.
The chargers require the connection of a charged battery in order to turn on. The battery provides boost voltage for the
charger, so a completely dead battery will not allow the charger to operate. The boost required is approximately 9 to 11
volts for a 12 VDC system, and 18 to 22 volts for a 24 VDC system. Replace the battery if it is below the boost voltage.
3.3.4— Engine Coolant Heater (If Equipped)
Heats the engine coolant when the unit is not operating. This action keeps the engine warm even in cold weather, help-
ing to ensure quicker starts. Powered by a circuit normally fed by the utility power supply.
3.3.5— Engine Oil Sump Heater (If Equipped)
Keeps the oil in the sump heated to allow easier starting and faster engine warm-up. Powered by a circuit normally fed
by the utility power supply.
3.3.6— Battery Warmer (If Equipped)
Keeps the battery warm so it can provide full cranking current when starting in cold conditions. Powered by a circuit
normally fed by the utility power supply.
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