Denyo — Generator Parallel Operation Procedure

For these Denyo models: DCA-220ESM, DF-2400M.

Applies to: Denyo DCA-220ESM, Denyo DF-2400M

Procedure

1. Start both generator sets and run them on no load to stabilize frequency and voltage.
2. Check the two synchronizing lamps on the No.2 set so that the lamps turn on and off synchronizing when the two phase sequences are in the same direction, while the lamps turn on and off alternately when the sequences are in the different direction. Recheck the cable connections for correct phase sequence if they turn on and off alternately.
3. At the instance when the synchronizing lamps turn off, turn on the breaker on the No.2 set. Note that generators can be damaged due to short circuit current if the breaker is turned on when the lamps turn on.
4. Upon the above procedure, the No.1 and No.2 sets are in parallel operation. The AC ammeters should indicate zero in this no load condition. If the meters indicate some current, it is an ineffective cross current due to voltage difference. Make it zero by adjusting the voltage regulator.
5. In the same procedure as the above items, parallel the generating sets of No.3 and so on if any.
6. Turn on the breakers on the load side. If each AC ammeter shows an imbalance in loading, make it in equal loading by adjusting the throttle lever for engine rpm. The set undertakes more load sharing when the engine rpm is adjusted higher, while less sharing when adjusted lower.

Source: manual:DCA-220ESM.pdf. Figures and steps are as documented; always cross-check against the official manual and any later revisions for your exact serial number before servicing.