I am rebuilding an industrial pedestal grinder. The original motor was 1.5 HP three phase. I replaced it with a modern 1.5 HP motor. The local supply house sold me a 1 HP drive that has a higher current capability than the motor nameplate current. The in house electrician states that this is not safe because the motor is larger than the drive rating. I disagree.
The grinder is wired as follows. Fused disconnect, appropriate size motor starter with overloads set by the motor nameplate data, VFD configured to start as soon as it receives power, and finally the motor. The grinding spindle is connected via a flat belt to the motor output shaft.
The system was modified because they wanted to be able to change the wheel speed based on the operation. The VFD is set up to operate between 43 and 86 Hz.
Am I correct in thinking it should be treated like any other fixed in place tool? The tool builder is responsible for picking the appropriate sized components?
Thanks.
