Section IV. OPERATION UNDER USUAL CONDITIONS

Section IV. OPERATION UNDER USUAL CONDITIONS 2-11. General. 2-14. Operation of Equipment. a. Instructions in this section are provided for information and guidance of personnel responsible for operation of the engine generator set. b. The operator must know how to perform every operation of which the engine generator set is capable. This section gives instructions on starting and stop- ping the engine generator set, operation of the gener- ator set and coordinating the basic motions to perform the specific tasks for which the equipment is de- signed. Since nearly every job presents a different problem, the operator may have to vary procedures to fit the individual job. 2-12. Starting. a. Preparation for Starting. Instructions to be followed when preparing to start the engine genera- tor set are shown in figure 2-6. Preventive main- tenance procedures to be performed before opera- tion are given in table 3-1. b. Starting. After performing the preparation for starting procedure of paragraph 2-12a, start the engine generator set as shown in figure 2-7. If the engine will not start or if any other abnormality is observed, notify organizational maintenance personnel. 2-13. Stopping. a. Normal Stopping. (See figure 2-8). Preventive maintenance procedures to be performed after equip- ment operation are given in table 3-1. b. Stopping by Safety Devices. The engine gen- erator set is equipped with safety device electrical circuits that will automatically stop the engine and simultaneously open the main ac contactor in case of; (1) high coolant temperature, (2) low oil pressure, (3) engine overspeed, (4) over-voltage or, (5) no fuel. A short circuit, overload, or reverse power protec- tive relay will automatically open the main ac con- tactor but will not stop the engine. On precise class 1 engine generator sets only, under voltage and under frequency relay protective circuits will similarly open the main ac contactor but will also not stop the engine. A specific FAULT INDICATOR (fig. 2-5) will light when any of these abnormal conditions occur. Refer to table 2-2 for the specific criteria for which these safety device electrical circuits operate. Once the engine generator set has been stopped due to the action of one of these safety devices, the problem must be corrected before the engine generator set is placed back in operation. c. Emergency Stopping. To stop the engine generator set in an emergency, open DC CONTROL CIRCUIT BREAKER (fig. 2-8). a. Single Engine Generator Set Operation. See-fig. 2-9 for single engine generator set operating instructions. b. Parallel Operation of Engine Generator Sets, See-fig. 2-10 for parallel operation instructions for up to 3 engine generator sets of the same class, mode and size. c. Emergency Operation. If any emergency situation requires continued operation of the engine generator set after being shut down by one of the safety device electrical circuits (para 2-13 b), the BATTLE SHORT switch (fig. 2-7) can be used to override all safety devices except the overspeed and short circuit operation of this switch is as follows: (1) Place BATTLE SHORT switch in OFF position. (2) Hold START-RUN-STOP switch in START POSITION and start engine (fig. 2-7). (3) Lift cover and push BATTLE SHORT switch to ON position. (4) Release START switch and push BATTLE SHORT switch to OFF position as soon as possible after emergency has passed. NOTE The BATTLE SHORT switch may be actuated, as necessary, any time the engine generator set is operating. d. Load Connections for Parallel Op- eration. NOTE Prior to attempting parallel operation, ensure all generator sets have the same frequency and voltage output. WARNING Lethal voltages are present at the load terminal board of the generator set during operation. Do not attempt to connect or disconnect load leads while the generator set is operating. Do not attempt to connect or disconnect load leads with the generator set shut down and the load connected to another power 2-18 Change 12