Caterpillar SR4B: Maintenance Interval Schedule (Standby) (Daily)

Generator Load Check

During normal operation, monitor the power factor and monitor generating loading.

When a generator is installed or when a generator is reconnected, ensure that the total current in any one phase does not exceed the nameplate rating. Each phase should carry the same load. This allows the generator to work at the rated capacity. If one phase current exceeds the nameplate amperage, an electrical imbalance will occur. An electrical imbalance can result in an electrical overload and and electrical imbalance can result in overheating.

The power factor can be referred to as the efficiency of the load. This can be expressed as the ratio of KVA to actual KW. The power factor can be calculated by dividing KW by KVA.

Electric sets normally have a low idle setting that is higher than industrial engines. Low idle will be approximately 66% of the full speed that is achieved by 60 hz units. This would be equal to 80% of the full speed that is achieved by 50 hz units.

Power Factor - Check.

The power factor of a system can be determined by a power factor by calculations. The power factor can be calculated by dividing kw by kva. Power factor is expressed as a decimal.

Stator Winding Temperature -Measure/Record.

Some SR4B generators are provided with optional 100 Ohm Resistance Temperature Detectors (RTD). If the generator is furnished with Resistance Temperature Detectors, the detectors are installed in the slots of the main armature (stator). The detectors are used with equipment that is provided by the customer. This equipment is used in order to measure the main armature's winding temperature. This equipment is also used in order to monitor the main armature's winding temperature.