Can anyone help on a miprom 21 problem. Keep getting 41 fault. Car runs but only makes floor to floor runs and throws 41 faults. Already changed encoder and speed boards.
41-saw the intermediate speed (67%) out of tolerance. May be a problem with the tach on the motor or an issue with the ETS board (not uncommon) Make sure your TM switch is correct and or your hoistway slow downs are correct.
Is this problem happening consistently or intermittently? This must be an analog AC if you have changed the speed boards. If you have a scope meter you can check your signal coming from the encoder to make sure it's clean back to the drive boards. Just went through this with a car that had a bad governor shaft causing intermittent encoder faults. Also, check the encoder power supply to make sure it's clean. Good Luck!!