Philips EZ130 User manual

If the traffic light of the Optimus control desk

indicates red even though the TTS temperatures are in the low ranges there must be a problem with the tube temperature switch supervision.

cutout of drawing Z1-3.3 kV control

A voltage of 1.7 … 3.3 VDC must be present at the input of kV-control EZ130 (or measure at the temp switch

decade pin 6) to get the green traffic light LED on leading to a ready state.

With AgenT one can also check the status of the tube housing temperature switch supervision signal:

The good condition is “closed”. Two conditions lead to a red traffic light indication:

1) The voltage of the TH_OL_SW/ signal is below 1.7VDC. The AgenT screen indicates “short circuit” for the tube temp switch condition. An error code 00TB might be logged. Possible reasons: Defective cable, short to ground. Short-circuit at micro-switches in tube housing. Defective measuring circuit on kV-control PCB EZ130.

2) The voltage of the TH_OL_SW/ signal is > 3.3VDC. The AgenT screen indicates “open” for the tube temp switch condition. No error is logged.

Possible reasons:

Open connection anywhere between the tube temp switch decade and the tube housing microswitches. Defective measuring circuit on kV-control PCB EZ130.