Varex Imaging nexus DR, Safety Manual

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5. Power and Environmental Specifications
Power requirements
Each component that requires AC power input is individually labeled on the device or on the
associated power adapter. Each label indicates the accepted voltage range, maximum current
draw, and expected frequency of the individual device.
All system components are expected to be powered from the same dedicated circuit.
Dedicated is defined as having no other branch circuits, providing power only to the Nexus DR
components, and being supplied directly from a breaker in the local AC distribution panel.
The cumulative power requirements of a complete Nexus DR system, including the detector,
are:
Table 4: Power requirements, complete system
Environment Number of phases Voltage range Frequency (Hz) Max Current
(Amps)
115VAC Single ± 10% 50Hz or 60Hz 8A
230VAC Single ± 10% 50Hz or 60Hz 4A
Input AC power must be free of noise, spikes, surges, and brownouts that deviate from
nominal voltage by greater than 10%. If these conditions cannot be met, a power conditioner
or UPS with power conditioning must be installed to provide stable power to system
components.
The following requirements must also be satisfied:
• Peak impulse levels (line to neutral) must not exceed 100V peak above nominal voltage
(peak time interval: 2ms or less).
• The neutral wire must be of the same gauge as the line wire.
• Frequency of AC waveform must not deviate more than 10% from nominal 50 or 60Hz.
• Neutral to ground potential must not exceed 2V peak-to-peak.
Environmental specifications
As with most other electronic devices, components of Nexus DR are sensitive to condensing
moisture and generate certain amounts of heat. The Nexus DR system must therefore be
installed in a controlled environment that provides an ambient temperature adequate for
cooling and maintains a humidity level that prevents condensation.
The detector employs passive convection cooling, dissipating heat primarily through the
outer case surfaces. The detector can overheat if installed in an enclosed environment that
prevents natural convection air flow across the rear surface of the detector. If the detector is
to be installed in a location that does not allow passive air flow, fans must be installed to the
surrounding structure to maintain an operating temperature within the range specified below.
24 | Nexus DR Regulatory and Safety Manual, 736-226-G1, Rev. J