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Joe Fanella: Hello,I 'm a technician at Navistar Inc. in Melrose Park, Il. We use Peaktronics DMC-101 motor controllers to control air dampers for our engine testing facility. We 've always had a problem where the air damper is commanded by us, to open to 100%. The correct 4-20ma signal is sent to the controller and the damper moves to 100%, but won 't return to the other direction, when commanded to do so. We verify the command current at the Peaktronics board, but both open and closed LED 's stay on and the damper freezes. We try adjusting the board according to specs without luck, and finally replace the DC-101 and this temporarity fixes the problem, but a month later, the same thing happens. When we measure the MOTOR 1 and MOTOR 2 wires at the DC-101, we get 24volts on both of them. This can 't be right because, the motor is being commanded in both directions then. Do you folks have any thoughts on why we might be going through so many boards? Could we be wiring the unit wrong? Thank you.
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