APX 525/625 Generator Revision C Service Adjustments
©
2005 Del Medical Imaging Corporation
7/5/2005 Page 124
• Check tightness of high voltage cable locking rings
Inspection of Power Module
• Check that circuit boards are securely fastened in place and that board
connectors are properly aligned
• Check that all electrical components are mounted securely
• Inspect electrical connections for signs of looseness or oxidation. Pay
careful attention to power and commutating capacitors as well as
incoming power supply connections
• Connect one lead of an ohmmeter to chassis ground. Check for an
open circuit condition at the following points:
a. TB1 and TB2 line terminal contacts
b. Inverter fuse
c. Both Sides of capacitors
d. Heat sinks on inverter
e. SCR gate leads
Inspection of Controller
• Check that all electrical components are mounted securely
• Inspect electrical connections for signs of looseness or oxidation
Operational Testing
1. Remove fuse F3 from the power supply board
2. Remove inverter fuse F1 from the inverter
3. Disconnect the stator, filament and high tension primary cables from the
power module
4. Turn the mains power disconnect switch ON. Do not turn the control on at this
time
5. Use a DVM to measure approximately 280 VAC (260 VAC if using single-
phase 208VAC input) at the input terminals of the line contactor
6. Measure 240 VAC at TB2-2 and TB2-3 on the relay control board
7. Press the ON switch on the side of the controller. Observe the following
actions:
a. The line contactor will energize after an approximate 7 second delay
b. The control panel will run through a short self test, then display the default
technique settings screen
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