We had an issue where a smaller company did a mod on a job site that I service mph2's. They put in GAL movfr door operators, well apparently one day I get a call that 4 out of 6 elevator doors are acting erraticly . Shaking not opening not closing. Turns out the building had a little dip in there power which In turn effected the 24vdc going to the door operators. We were getting 22.5 or 23vdc. Just was enough to screw up the doors. We suggested added a 24vdc power supply to the door operator in case it happens again . Of course nothing happened.
