2.2.1.4 Misalignment of the Upper and Lower Heads
If the upper head does not completely cover the lower head for any reason, care must be
taken that nobody is exposed to the beam. Pushing any off sheet button, either on an
operator station or on the scanner control panel, closes the shutter, eliminating the
hazard, as can be verified by observing the shutter status indicator lights.
If any substantial upper and lower head misalignment occurs, if there is
any physical damage to the frame or heads, or if any fire condition occurs
near the heads, call the Radiation Safety Department immediately and
keep the area clear of personnel until the scanner has been checked.
If the heads become separated, the head separation switch detects it and closes all
shutters. The QCS software detects the lack of measurement, raises an alarm, and the
moves the heads off sheet. Operation is not allowed until corrective action is taken
2.2.2 Electrical Safety Hazards
2.2.2.1 Voltage Zones
Electrical systems extend throughout the scanner frame, and exist at multiple voltage
levels including:
• 208–240 V AC
• 56 V AC
• 24 V DC and lower
Multiple levels of electrical protection exist and include:
• Key lock cabinet enclosures
• GFI and circuit breaker protection
• Protected earth grounding of enclosure
• Voltage level grouping
• Recessed terminal contacts
Figure 15, Figure 16, and Figure 17 map out some electrical hazard voltage zones. Figure
15 shows cable end electrical hazard voltage zones.
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