1) Look at the array temperature on "wfcamSensors.dl" epics screen (type "dm wfcamSensors.dl" on kauwa or ohi), or on the Channel Archiver Plots
(on any computer)
2) WFCAM can be used once the array is back at 75K and its heater is at least
5% to give some margin for control.
3) After enabling the arrays, if the heater
drops back to 0 and the arrays start warming, then disable the arrays
again and wait until the heater reaches 10% and the temperature reaches 75K