PIN GP-CYLINDER 1346775 - Caterpillar

rated load is reached. Note voltage regulation with changes in load steps.Check for vibration levels at no load and rated load. A slight increase in vibration level from no load to full load is normal. As the load is maintained for 2-3 hours the vibration levels will gradually increase and reach a final level.Parallel Operation
For the generator to operate in parallel with another system, the phase sequence of the generator must be the same as the system. Phase sequence check can be determined by a phase rotation meter or incandescent lamp methods described in electrical machinery handbooks.The output voltage at the paralleling point must be the same at each instant which requires that two voltages be of the same frequency, same magnitude and same rotation, and must coincide with each other.Voltmeters indicate whether the voltage magnitude is the same and frequency meters indicate whether the frequencies are the same. Whether the voltages are in phase and exactly at the same frequency is indicated by a synchroscope or by synchronizing lamps.A synchroscope can be utilized to indicate the difference in phase angle between incoming machine and the system. The generator can also be paralleled by using incandescent lamps connected as shown. The voltage rating of series lamps must equal the voltage rating of the generator. Each prime mover in the system must have the same speed regulating characteristics, and the governors must be adjusted to give the same speed regulation by applying load that is proportional to full load rating of the generator.Voltage regulator must include paralleling circuitry. Paralleling current transformers must give the same secondary current.Current transformer secondary winding provides reactive KVA droop signal to the voltage regulator. Accidental reversal of this electrical wiring will cause the voltage to rise rather than droop. If this occurs during paralleling, stop the unit and reverse the wires at the voltage regulator terminals.If set is provided with unit parallel switch, set switch to PARALLEL position on the unit being synchronized.Synchronize the generator by adjusting speed (frequency) slightly higher than the system. Observe the synchroscope or the lamps. The lamps should fluctuate from bright to dark at the rate of one cycle every 2 to 3 seconds. When the generator is in phase the lights will be dark, close the circuit breaker. Immediately after closing the breaker measure the line current, kW and kVAR of the generator. The readings should be within the rating of the unit.A high ammeter reading accompanied by a large kW reading indicates faulty governor control.A high ammeter reading accompanied by a large kVAR unbalance indicates problems with voltage regulator. Adjustments of the cross current or voltage droop rheostat should improve the sharing of kVAR.To shut down the generator operating in parallel, gradually reduce the kW load by turning the governor switch to reduced speed. When kW load and line current approach zero, open the generator circuit breaker. Close the unit parallel switch (if generator is so equipped). Operate the generator unloaded for several minutes to dissipate the