Uninterruptible power supply

Finally, the new UPS units arrived and were installed. Also a communication card was ordered and installed, providing full control of the unit through ethernet with all kinds of information about consumption, fail states, etc. We are now in the process of adding all this information it to our general monitoring system.

The final design of the electricity circuit provided by the normal mains and the generator through the UPS was slightly changed. All non-essential devices are connected after the generator, but before the UPS, such that the full load will only apply when the generator is working. This also makes the modification simpler and cheaper.

The new UPS units are 99% efficient, so this should results in a somewhat lower consumption. Also, all light bulbs in the telescope entrance and control room were changed to LED type.

There was a mechanical problem with the generator where a glass cup was broken, resulting in the diesel tank emptying. The cup was replaced with a metallic one, and the tank was refilled.