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ATV61 250kW 400VAC drive with short circuit fault on water pump motor. When we originally had the Motor Short Circuit fault we had menu - motor control - motor control drC type - nLd default menu setting. On start up it ran for about 6 seconds then tripped on Motor Short Circuit. We changed the nLd setting to Motor Control drC UF2 [V/F 2pts] this allowed us to start the motor and run OK. When we stop the motor (ramp down time 20secs) the drive slows down until the motor is just about stopped then we get the Motor Short Circuit fault again.
Both motor and cable megger clear. Any ideas to a solution?
Both motor and cable megger clear. Any ideas to a solution?
