Using the Fluke 62 Mini Thermometer (IR) I checked the status of the input and output air on all of the Kepco power supplies at EX, EY, and CER Mezzanine per WP11586

EX and CER tested normal.  Air flow is good, all supplies humming away, no odd vibrations.

At EY, ISC-YC1-TCS -24V supply looked to have a stuck fan.  The supply is part of the ISC-YC1-TCS +/- 24V pair located in slot 18 of the C2 Power rack on the right hand side (RHS).

Ambient air at EY is 65F, air measured at the fan braket at 110F, and air measured output air at 80F.  This supply shows -24V at 0A, low current is the reason it has not tripped already.

This pair of supplies powers pair of RF Oscillators and RF Amplifiers at EY.  This is part of the Low Noise Power system thus its current draw on the +/- 24V is very low, as it is a reference.

Last checkup of supplies was September 19th, linked here ALOG72968 all supplies checked out normal.  No issues were reported between then and now.

We replaced the supply with an upgraded spare with new ball bearing fan installed per WP11588 and we can hope for smooth sailing through the Christmas break.

Kepco with Failed Fan SN = S1300290

Kepco with Ball Bearing Fan SN = S1201931

M. Pirello, F. Clara