3700 Series Flat Panel Industrial PC
Chapter 2 – Installation
17
143311 (H)
Power Supply
The power supply on 3700 models provides 200 Watts of output power throughout
the system’s temperature range. The power available for expansion is limited, as
shown in
Table 2-1.
Table 2-1. Available Expansion Current
Available Current
Voltage
3712 & 3715 models
+3.3 VDC
10 A
+5.0 VDC
6 A
-5.0 VDC
0.2 A
+12.0 VDC
4.9 A
-12.0 VDC
0.5 A
Caution:
+5V and +3.3V combined not to exceed 36 watts
–5V and –12V combined cannot exceed 8 watts
Excessive Heat
The units withstand temperatures from 0º to 50ºC, and are fan-cooled. To keep the
temperature in range, the cooling air of the system must not exceed 50°C. Allocate
proper spacing between internal components installed in the enclosure. Units with
standard BIOS release 1.3 or greater will automatically throttle down the CPU
speed if the temperature exceeds the maximum allowed CPU temperature.
Electrical Noise
Electrical noise is seldom responsible for damaging components, unless extremely
high energy or high voltage levels are present. However, noise can cause
temporary malfunctions, which can result in hazardous machine operation in
certain applications. Noise may be present only at certain times, may appear at
widespread intervals, or in some cases may exist continuously.
Noise commonly enters through input, output, and power supply lines, and may
also be coupled through the capacitance between these lines and noise signal
carrier lines. This usually results from the presence of high voltage or long, close-
spaced conductors. When control lines are closely spaced with lines carrying large
currents, the coupling of magnetic fields can also occur. Use shielded cables to
help minimize noise. Potential noise generators include switching components,
relays, solenoids, motors, and motor starters.
Refer to the relevant Federal, State/Provincial, and local electric codes, which
provide data such as the size and types of conductors, color codes and connections
necessary for safe grounding of electrical components. It is recommended that the
high voltage and low voltage cabling be separated and dressed apart. In particular,
the AC cables and switch wiring should not be in the same conduit with all
communication cables.
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