jason.oberling@LIGO.ORG - posted 12:59, Tuesday 12 June 2018 - last comment - 11:43, Wednesday 13 June 2018(42481)
70W External Shutter Update
A quick update on the external shutter installation. We are still having issues with the external shutter, so it did not get connected today as we had planned. The shutter assembly has been removed from the shutter enclosure and we are testing it in the EE lab.
Ed found the problem, the shutter was wired to the wrong polarity. So when we tried to actuate the shutter it would obviously not. This is also the cause of the blown Control Box fuse from back in April. Ed fixed the polarity issue and we tested the shutter in the EE shop; it functioned as expected. We will install the shutter during the next Tuesday maintenance period.
This issue happened because of an ambiguity in the wiring diagram for the shutter. The diagram only covered the wires that come directly out of the shutter, not the cable that is attached to the shutter assembly (see picture). The wiring diagram is being updated to add the wiring for the cable attached to the shutter.