• Electric starting
---check whether the electrolyte proportion of the starter battery is between 1.240 and 1.280. If the ratio is lower than 1.180, it means that the there isn’t enough electricity in the battery.
---Ensure that the electric circuit is correctly connected and the control system is preparing for the starting. The air clutch shall be disengaged.
---Ensure that the connection terminals on the battery are not fouled or oxidized. If so, rub off the foul or scales.
---Ensure that the electric contact pins on the starter motor and the solenoid provide good contact.
• Pneumatic starting
---Ensure that there is no leakage in all sections of the air pipes including joints.
---Ensure that the pressure of the air bottle is between 2,500 and 3,000 kPa.
Generator set Adjustment
There are two types of SOMAX Generator sets, ordinary and automatic. Please refer to their respective instruction handbook for the starting methods.
a.First, adjust the engine to idling speed (500-700r/min). For engines with mechanical speed governor, use the speed control arm to adjust the speed. For engines with electronic speed governor, use the idle knob on the speed controller to adjust the speed.
b. Switch on the power supply. Start the Generator set if the warning lamp gives out no warning signal (for Generator set equipped with protection mechanism).
c. Generator sets equipped with preheating and prelubricating mechanisms can be started if the preheating and prelubricating processes have been completed. Press down the start button. If the Generator set is not started within 10 seconds, release the start button immediately and try it a second time after a 2 minutes interval.
If the starting effort fails for the third time, do not try again. Find out the problems and fix them. After that the Generator set may be restarted and the interval between each starting trial shall not be less than 30 seconds.
d. When the Generator set is successfully started, release the start button immediately. Meanwhile the amperemeter for the charging current shall points to the positive position or the charging voltmeter
indicates a charging current voltage≥25V. These mean that the charging is working well. For Generator sets
equipped with working conditions protection mechanism, if light or acoustic warning is signaled, the Generator set must be stopped for a check.
e. The idling speed of the Generator set shall remain between 500 to 700r/min. Keep a close watch on all the instruments and pay attention to abnormal noises or phenomenon. If there is any abnormity, decision must be made as whether to stop the Generator set.
a. After the Generator set is started, increase the engine velocity gradually to a level between 1,000 and 1,200 r/min to warm it up. When the coolant drained from engine eaches 450C, the engine can be revved up to rated speed. If the Generator set can work well at no loads, engage the Generator set circuit breaker to supply power to the load. If the Generator set can not automatically establish a voltage, please check whether the AVR panel is working normally and magnetize the Generator set if necessary. When voltage is established, adjust the voltage-variable resistor to pinpoint the no-load voltage to the rated value and then engage the circuit breaker to supply power to the load.
b. If several Generator sets work in parallel, the operation staff shall ensure that the Generator sets have synchronized phases before turning on the parallel switch. This is to avoid impacts on the Generator sets from phase variation.
c. If the paralleling fails for several time, please remove the load, separate the Generator sets and adjust each Generator set individually.
d. Exert realtime monitoring on the working conditions of each parts during the normal operation of the Generator set. Visit the instruments and warning lamps and record the readings once an hour. Usually, the coolant temperature is900Cand shall never exceed950C.
e. Check the amount of fuel and oil regularly. If the fuel level goes below one third of the tank, it needs to be refilled. If the oil level on the dipstick is below the minimum mark, more oil is needed.
f. Load variation shall be gradual and even. Except in emergencies, sudden engagement and disengagement of loads are prohibited. The Generator set shall not work at full load before the coolant past the engine reaches550Cand the oil reaches450C.
g.For Generator sets in noise-proof rooms, regular access into the room is required to check the working conditions of the Generator set and record instrument readings. If there is any abnormity, solve them as soon as possible.
h. During the operation of the Generator set, dedicated personnel is required to check and replace air, fuel and oil filters. If there is any leakage of air, fuel and oil, have them fixed as soon as possible.
③ Stop the engine
b.Diminish the load gradually until completely remove it from the Generator set. Disengage the Generator set circuit breaker and let the engine run at idling speed for 3 minutes before it comes to halt. Try not to stop the engine at full load to avoid overrev.
c.If open cooling system is used, shut off the water inlet. In cold environment where the ambient temperature drops below00C, the remaining cooling water in the cooling system shall be completely drained so that the mechanic parts of the machine would not be damaged by freezing. Coolant with anti-freezing additives is an exception.
d.Backup Generator sets or Generator sets seldom used shall be sealed with grease as required. If not grease sealed, they must be started to run at load for 5 to 10 minutes as least once per week to avoid rusting of the inside parts.
e.The Generator set can be stopped emergently in the following way: disengage the Generator set circuit breaker quickly and place the throttle in the “stop” position to shut off fuel supply after the load is removed. This will completely halt the engine.
f.After the Generator set stops running, a timely check must be carried out on the Generator set surface. Wipe off the grease on the Generator set, record the time it stops, check the condition of the battery and check if refuel is needed or not.
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