Mounting and Wiring VMA1200 Series Controllers Technical Bulletin
5
•
Do not run L
ON
W
ORKS
Network Bus, Zone Bus,
Analog Input (AI), Binary Input (BI), Analog Output (AO), or
Binary Output (BO) wiring in the same conduit as line voltage
wiring (above 30 VAC), or with wiring that switches power to
highly inductive loads such as contactors, coils, motors, or
generators.
•
Run Zone Bus, AI, AO, and BI wiring in the same bundle or
conduit where convenient. If the BO wiring is
not
wired through
other switches or contacts, such as actuator end-of-travel switches,
you may also bundle it with the other I/O (Input/Output) wiring
where convenient.
The following are additional general wiring considerations:
•
The VMA includes an isolated L
ON
W
ORKS
Network Bus, isolated
binary outputs, and isolated 24 VAC. See
VMA Internal Schematic
Diagram
in this section.
•
The 24 VAC power input is internally transformer isolated by the
VMA. To meet NEC requirements for line voltage greater than
150 VAC, Terminal 1 (24 VAC) can be earth grounded.
•
Up to 14 cooling-only VMAs (Model VMA1210) are powered
from one 100 VA low voltage power limited, Class 2 transformer.
The number of VMA1220s per transformer varies, depending on
power requirements of the valve actuators and relays. Conduit is
not needed for 24 VAC at 100 VA or less.
•
Large insulated spade lugs with a polarizing tab (for high voltage)
do not fit on the VMA.
