AltAz power supply

As in the last semester, we had various ($\sim$10) reports throughout the semester which noted problems during telescope power-on and possibly in a few cases caused an automatic power-off of the telescope which all appear to be related to errors of the power supply of the AltAz motors. In general these problems caused little (or no) down time. The total amount of down time caused by this over the whole semester is difficult to estimate precisely as in some cases the error occurred when the telescope had to be powered-off and -on for some other reason that caused the bulk of the down time in the specific report, but is not more than 2 hrs. In general, it seems that these errors only occur when powering-on following a power-off after the telescope has been powered-on for some time. However, it is also not entirely clear that all these problems have the same cause as, e.g., a building crash can also cause this type of error. Further tests are being planned in the near future.