HF Series Generators
T roubleshooting
TR-1005R4
93
ERROR CODE : E78
DESCRIPTION : Excessive current in main winding braking at 10000 RPM.
ERROR TYPE : Indicative. Does not allow exposures.
APPLICABLE TO : All Generators with DRAC or L V-DRAC.
APPEARS WHEN : During Anode acceleration at High Speed.
INFORMATION / SYMPTOM : During braking operation of the anode at high speed, E78 is displayed.
POSIBLE CAUSES
Excessive current in main winding is detected.
ACTIONS
1. Check Switches configuration 324SW1 and 3243SW2 in CONTROL DRAC PCB. Refer to T ube
Family Selection in DRAC Documentation.
2. Check CR8, CR9, CR10 and CR11 in INTERFACE DRAC PCB. If any of them is found defective,
replace INTERFACE DRAC PCB.
3. Check Stator T ube Winding impedance (main) according to the X-ray Tube Stator
specifications.
4. Check correct Isolation between connections Main winding and auxiliary winding in TS2. If
winding in TS2 is not OK, replace TS2.
5. Turn off Generator, wait 3 minutes and check the PTR1 Module at the CONTROL DRAC PCB
in the following way:
G Connect a Multimeter in Capacitor or Resistor Mode between:
P+ and U,V,W in direct and inverse
N-- and U,V,W in direct and inverse
In case you decide to measure the Gate signals with the Oscilloscope and the
generator Turned On, disconnect cables J2--1 and J2--2 at Control DRAC as these
points are High Voltage with respect to Ground.
G In the same PCB measure PTR1-2 , 3--4, 5--6, 7--8, 9--10, 1 1--12 in direct and inverse . If
any defective connection is found, replace CONTROL DRAC PCB.
6. Disconnect Stator Cables at X--ray T ube Side but keep cable connected to TS2. Press “PREP”
a. If any other Error message appears (Insufficient Current) replace the X-ray Tube.
b. If the same error remains, disconnect Stator Cable at TS2 Generator .
c. If any other Error message appears (Insufficient Current) replace Stator Cable.
d. If Error remains, disconnect Primary at Transformer (Main or Auxiliary) at J1 Connector of
Control DRAC and Press “PREP”.
e. If any other Error message appears (Insufficient Current) replace T ransformer.
f. If the same error remains, replace CONTROL DRAC PCB.
Note .
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