Sedecal Shf 330 Communication Error E74 - Servicetechniker Forum

SEDECAL SHF 330 communication error E74

Tags: Radiology - R/F

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Emmanuel Quaye

SEDECAL SHF 330 communication error E74

September 11, 2020 09:37

SEDECAL SHF 330. I have communication error E74 After exiting service Mode.

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Ronald Swapp

re: SEDECAL SHF 330 communication error E74

September 14, 2020 10:29

Error 74 is: Excessive current in main winding braking at 3300 rpm and will not allow further exposures.
This appears during Anode acceleration at Low Speed.
During braking operation of the anode at low speed, E74 is displayed.
Possible Cause: Excessive current in the main winding is detected.

*Check switch configuration 324sw1, 3243sw2 in control DRAC board. Refer to the tube family selection in DRAC documentation.
*Check CR8, 9, 10 & 11 in the interface board. If any of them are found defective replace either the board or diodes.
*Check the stator tube winding impedance (main) according to the tube stator specifications.
*Check correct isolation between connections (main) and (auxiliary or start) winding in TS2. If winding in TS2 is not ok replace TS2.
*Turn off generator, wait 3 minutes and check the PTR1 module at the control DRAC board in the following way:
Connect a meter in cpacacitor or resistor mode between
P+ and U,V,W in direct and inverse
N- and U,V,W in direct and inverse
In the same board measure PTR1-2, 3-4, 5-6, 7-8, 9-10, 11-12 in direct and inverse. If any defective connection is found replace the DRAC board.
*Disconnect the stator cable at the tube side but keep cable connected to TS2.
Press Prep.
a) If any other error message appears (insufficient Current) replace the tube.
b) If the same error remains, disconnect the stator cable at TS2 Generator
c) If any other Error message appears (Insufficient Current) replace the stator cable.
d) If error remains, disconnect Primary at the Transformer (Main or Auxiliary) at J1 of DRAC and Press Prep.
e) If any other message appears (Insufficient Current) replace the transformer.
f) If the same error remains, replace the DRAC board.

I've also had some funky messages if you didn't successfully complete the calibration per the calibration instructions.

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