Maerin
Guru
So, 2 new Mermaid A/C systems, one 12K, one 16.5K. both 220V. Discovered that the blowers on both units won't run when on the genset. No problem at all on shore power. Genset is 12.5 kw, it's not heavily loaded, voltage is 232 at power connection on the A/C control box. It's an FX-1 control board. Fan motors are fractional HP, shaded pole with a 2uf capacitor. Capacitors test within rating. Compressors and pump relay function normally.
It appears that this problem is related to the Magnum 2812 charger being energized and in bulk, e.g. >100A charge rate. When the charge rate is closer to or floating, the blowers run OK; if the charger is switched off/standby, also run OK. I also have an older 12K Mermaid, it runs fine, never has been a problem, so it's perplexing why the 2 new units are misbehaving. I haven't had the opportunity to duplicate the problem on shore power by discharging the bank to replicate the conditions when the charger comes on when the genset is 1st started. No problems with any other electrical gear on board.
A conversation with Mermaid was inconclusive, they will do some research. My suspicion is that there may some power-related noise from the charger that's getting into the power supply and causing a problem with the PC board and/or the phase shift in the blower motor. I'm not sure how to conclusively isolate the problem, or how to resolve it. Welcome suggestions.
It appears that this problem is related to the Magnum 2812 charger being energized and in bulk, e.g. >100A charge rate. When the charge rate is closer to or floating, the blowers run OK; if the charger is switched off/standby, also run OK. I also have an older 12K Mermaid, it runs fine, never has been a problem, so it's perplexing why the 2 new units are misbehaving. I haven't had the opportunity to duplicate the problem on shore power by discharging the bank to replicate the conditions when the charger comes on when the genset is 1st started. No problems with any other electrical gear on board.
A conversation with Mermaid was inconclusive, they will do some research. My suspicion is that there may some power-related noise from the charger that's getting into the power supply and causing a problem with the PC board and/or the phase shift in the blower motor. I'm not sure how to conclusively isolate the problem, or how to resolve it. Welcome suggestions.