Wiring
CAUTION
Risk of Electric Shock
Disconnect the power supply before making electrical
connections to avoid electric shock.
ATTENTION
Risque de décharge électrique
Débrancher l'alimentation avant de réaliser tout rac-
cordement électrique afin d'éviter tout risque de
décharge électrique.
Important:
Do not connect supply power
to the controller before finishing wiring and
checking all wiring connections. Short circuits
or improperly connected wires can result
in damage to the controller and void any
warranty.
Important:
Do not exceed the controller
electrical ratings. Exceeding controller electrical
ratings can result in permanent damage to the
controller and void any warranty.
Important:
Use copper conductors only. Make
all wiring in accordance with local, national, and
regional regulations.
Important:
Electrostatic discharge can
damage controller components. Use proper
electrostatic discharge precautions during
installation, setup, and servicing to avoid
damaging the controller.
For information on configuring and wiring
a BACnet/IP network, refer to the
Metasys IP
Networks for BACnet/IP Controllers Configuration
Guide (LIT-12012458).
For detailed information on
configuring and wiring a SA Bus, refer to the
MS/TP
Communications Bus Technical Bulletin (LIT-12011034).
VMA terminals and bus ports
See for input and output terminal and bus port
locations on the controllers. Observe the following
guidelines when wiring a VMA controller.
Input and Output terminals
The input spade terminals are located on the
bottom of the VMA near the FC Bus terminal block.
The output spade terminals are located on the top
of the controller near the power supply . For more
information, see Table .
FC bus terminal block (Or N2 protocol as
required)
The FC Bus terminal block is a blue, removable, 4-
terminal plug that fits into a board-mounted jack.
Wire the removable FC Bus terminal block plugs
on the VMA and other controllers in a daisy-chain
configuration using 3-wire twisted, shielded cable
as shown in Figure 3. See
Figure 3: FC bus terminal block wiring
Note:
The Shield terminal (SHLD) on the FC
Bus terminal block is isolated and can be used
to connect the cable shields on the bus (Figure
SA Bus terminal block
The SA Bus terminal block is a brown, removable,
4-terminal plug with +15 VDC that fits into a board-
mounted jack. Wire the removable SA Bus terminal
block plugs on the VMA and other SA Bus devices
in a daisy-chain configuration using 4-wire twisted,
shielded cable as shown in Figure 4. See Table for
more information.
VMA1615/1626/1628/1630 VAV Controllers Installation Guide
6
