IM620-1
15
Field Wiring
Following are descriptions of the various field wiring requirements and options. Typical field wiring
diagrams are shown in Figures 7 and 8. Wiring must comply with the National Electrical Code and all
local codes and ordinances. The warranty is void if wiring is not in accordance with these
instructions.
The panel is separated into high and low voltage sections. The power wiring should enter the bottom
knockout on the right side of the panel in the high voltage section. Wiring from the Output Board
should enter through one of the
7
/
8
-inch knockouts in the high voltage section. Communications
wiring, wiring to the ICM Terminal Board, and wiring to the AOX-4 should enter through one of the
7
/
8
-inch knockouts provided in the low voltage section.
Note:
High voltage wires should not pass through the low voltage section and the low voltage wires
should not pass through the high voltage section.
Power
!
WARNING
Electric shock hazard. Can cause personal injury or death.
This equipment must be properly grounded.
All protective deadfront panels must be reinstalled and secured when power wiring is
complete.
The MAG requires a 115 Vac power supply. The supply connects to terminals L1 and L2 in the high
voltage section of the panel. The panel must be properly grounded by connecting the ground lug
(GRD) to earth ground. Refer to Figures 7 and 8. Power wiring must be sized to carry at least 5 amps.
To gain access to the high voltage section, remove the deadfront barrier. It is attached to the panel
with five
5
/
16
-inch hex screws. Replace this deadfront when the wiring is complete.
Network Communications
For network communications to occur, a twisted, shielded pair cable must be connected between the
MAG and its associated MicroTech unit or network controllers. This interconnecting, “daisy-chain”
wiring is shown in Figures 7 and 8. Network communications is accomplished using the RS-485
interface standard at 9600 bps.
About MicroTech Network Architecture
All controllers in a MicroTech network are assigned a “level”: level 1, level 2, or level 3. All networks
must have one level-1 controller to coordinate communications. Multiple level-2 controllers connect to
the level-1 controller with a communications “trunk,” an isolated section of the daisy-chained network
wiring. In Figures 7 and 8, the network wiring between all controllers is a trunk. Multiple level-3
controllers can be connected to a level-2 controller with a separate trunk.
The maximum allowable
length of
a communications trunk is 5000 feet.
Cable Specification
The network communications cable must meet the following minimum requirements: twisted, shielded
pair with drain wire, 300 V, 60°C, 20 AWG, polyethylene insulated, with a PVC outer jacket (Belden
8762 or equivalent).
Some local codes or applications may require the use of plenum rated cable.
Do not install the cable
in the same conduit with power wiring
.
