All the shed electronics and computer (except the motor power, see details about the Power Switch below) are powered through a UPS (Uninterruptible Power Supply) whose role is to protect the setup from short (1/4 h) power outages and to convert the US AC power (60Hz, 200V between two phases) in a well stabilized AC power of European type (220V, 50Hz). When working in the shed, be careful about the electrical hazard as the setup can remain powered a long time after interrupting the UPS input (see "Shed access and safety" above).
The UPS unit is located under a table, in front of the electronics rack. It has a display, a small keyboard and a beeper. The beeper activated means that some important message about the UPS is displayed. In this case, use the keys to scan the UPS memory, read the messages, record them in the e-logbook, stop the beeper and inform Arun. Refer to the UPS manual (available in the shed) for details of operation.