Emerson Micro Motion MVD Direct Connect, Руководство по установке

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Installation Manual 11
Installation
3 Installation
3.1 Supplying power
Power supply requirements depend on your installation type:
• MVD Direct Connect without the MVD Direct Connect I.S. barrier (see Figure 2-1 and
Figure 2-2 )
• MVD Direct Connect with the MVD Direct Connect I.S. barrier (see Figure 2-3 and Figure
2-4 )
3.1.1 MVD Direct Connect installations without the
MVD Direct Connect I.S. barrier
In MVD Direct Connect installations without the I.S. barrier, power is supplied directly to
the core processor. The core processor supplies power to the sensor. The power supply
must meet the following requirements:
• Power must be supplied from a common floating regulated power supply with the
correct voltage.
• The voltage requirement for a single core processor is 15–26 VDC. The maximum
power consumption of a single core processor is approximately 3 W.
• The power supply may be used to power any number of core processors, but must not
be used to power other devices.
• Use shielded wiring.
• The power supply must not allow power surges or conducted radio frequency
interference (RFI) to propagate through to its output.
• The power supply must not be grounded.
• In EU countries, the power supply must meet the requirements of the EMC directive.
• The power supply cable must comply with the size and length requirements listed in
Table 3-2 . A minimum DC input of 15 V is required for each core processor. At startup,
the power source must provide a minimum of 0.2 A of short-term current per core
processor. The maximum steady state current is 0.15 A. For assistance in sizing the
power supply cable, refer to
Table 3-1 and use the equation below:
CAUTION!
Grounding the power supply to the core processor can cause damage to the core processor or
the remote host. To avoid damaging the core processor or the remote host, ensure that the
power supply to the core processor is not grounded.
MinimumSupplyVoltage 15V CableResistance CableLength

0.15A
  
+ =