Design Considerations - Johnson Controls 300 Series Manual

Design Considerations

Network Control Module 300 Series Technical Bulletin
Power
!
IMPORTANT: Install the NU-ROM101 or NU-ROM150 before
applying power to the NCM. If either the NU-ROM101 or NU-ROM150 is not
installed when power is applied to the NCM, the NCM DRAM and NOVRAM
may be corrupted. If the NOVRAM is corrupted, replace the NCM.
Consider the following power requirements for the NCM:
• The NCM requires between 90 and 230 VAC, 500 mA at 50/60 Hz
from a single-phase circuit. No switch settings or rewiring are
necessary to change from the 120 VAC to 230 VAC.
• Select a power circuit free of heavy equipment loads (for example,
large multiphase induction motors).
• The NCM must be referenced (grounded) to a green-wire earth
ground.
• Built in AC surge protection circuitry on the NCM is rated to
withstand surges of up to 6 kV @ 3 kA (IEEE 587 standard).
External surge protection is unnecessary, except in high-voltage
environments or in cases of extreme lightning.
• Do not use a Spade Bit to make a hole in the EWC for the power
conduit, or the NCM's grounding strip will be damaged. Use a
Step-Bit or Greenlee Tool to make a hole for the conduit.
• Figure 4 shows how to wire the NCM power cord into the power
entry box in the EWC22. Once this wiring is complete, the switch
on the power entry box controls power to the NCM.
• Figure 5 shows how to wire the power connection into the
NCM311 or NCM361.
Mounting
Mount the NCM in a suitable enclosure near its line voltage
connections. The unit is designed to fit into a variety of enclosures.
Figure 2 shows the overall mounting dimensions. Figure 3 shows the
NCM mounted in an EWC22. Figure 4 shows how to wire the NCM
power cord into the power entry box in the EWC22. For more
information on the EWC22, see the Universal Packaging Module
Technical Bulletin (LIT-6363070).
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