Intriguing DG Deloading problem

Last August (2017), we came across a very intriguing (on the verge of being unintelligble as the problem was staring at us point-blank) problem onboard a container ship. What was this problem? We had these two DGs , when operated in parallel, which could not deload fully. i.e. Either of the two DGs could not deload to the setpoint for the Deif PPM controller to open its respective breaker. The deloading consistently got stuck at 50~70kW. Some key points that we considered during the troubleshooting process: 1. Problem occurred in both Automatic or Manual mode. This ruled out the respective PPM controllers being responsible for this problem. 2. Both DGs were able to take on load normally. Bot

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