Johnson Controls MS-VMA1615-0U, Руководство по установке, Страница: 8 / 21

Setting the Device Address .) Also, activate the
end-of-line (EOL) switch if necessary.
5. Connect the VMA controller to 24 VAC, Class 2
power.
Wireless Network Applications
Important: Wireless operation is not approved for
smoke control applications. Refer to the
Metasys ® System UL 864 10th Edition
UUKL/ORD-C100-13 UUKLC Smoke
Control System Technical Bulletin
(LIT-12012487)
for detailed requirements
and procedures for installing,
commissioning, and operating UL 864
UUKL/UUKLC Listed Metasys system
devices.
VMA Terminal Functions, Ratings,
Requirements, and Wiring Guidelines
Input and Output Wiring Guidelines
Table 3 provides information about the functions, ratings,
and requirements for the VMA input and output terminals,
and
Table 4 provides guidelines for wire sizes and cable
lengths.
In addition to the wiring guidelines in Table 3 , observe
these guidelines when wiring VMA inputs and outputs:
• Run all low-voltage wiring and cables separate from
high-voltage wiring.
• All input and output cables, regardless of wire size or
number of wires, should consist of twisted, insulated,
and stranded copper wires.
• Shielded cable is not required for input or output
cables but is recommended for input and output
cables that are exposed to high electromagnetic or
radio frequency noise.
• Cable runs of less than 30 m (100 ft) typically do not
require an offset in the input/output software setup.
• Cable runs over 30 m (100 ft) may require an offset
in the input/output software setup.
Maximum Cable Length versus Load Current
Use Figure 8 to estimate the maximum cable length
relative to the wire size and the load current (in mA) when
wiring inputs and outputs.
FC and SA Bus and Supply Power Wiring
Guidelines
Table 5 provides information about terminal block
functions, ratings, and requirements.
Table 5 also provides wire size, cable type, and cable
length guidelines for wiring the VMA communication
buses and supply power.
In addition to the guidelines in Table 5 , observe these
guidelines when wiring the SA/FC Buses and supply
power:
• Run all low-voltage wiring and cables separate from
high-voltage wiring.
• All FC and SA Bus cables, regardless of wire size,
should be twisted, insulated, stranded copper wire.
• Shielded cable is strongly recommended for all FC
and SA Bus cables.
• Refer to the MSTP Communications Bus Technical
Bulletin (LIT-12011670) for detailed information
regarding wire size and cable length requirements for
the FC and SA Buses.
8 VMA1615 and VMA1630 Variable Air Volume Controllers Installation Instructions