18
IM620-1
Use the following procedure to perform the Direct Connect wiring:
1.
Connect the Communications Interface Cable (CIC) to the absorption chiller. Connect the wires
from the CIC to terminals B+, B–, and GND in the MAG as shown in Figure 8.
Figure 8. Typical Field Wiring Schematic: Direct Connect MAG
MCB
Direct Connect MAG
L1
L2
Microprocessor
Absorption Chiller
Unit Controller
To Open Protocol BAS Integrator
or Personal Computer
B+
B-
GND
A+
A-
GND
ICM Terminal
Board
Communications
Interface Cable
Hot
Neutral
Legend
Field Wiring
Terminal
Cable: Shielded,
Twisted and
Jacketed Pair with
Drain Wire
Factory Wiring
Field Wiring
Line
Input
a0168
PC Connection
The PC is connected to any MicroTech controller at port A on the MCB. It is best to connect a PC to
a level-1 controller because faster data transmission results; however, a PC can be connected to any
level-2 controller that does not have level-3 controllers associated with it. Either way, the PC has
access to the entire network (see note below). In the typical application, the NMP is a level 1, the
MAG and other controllers are level 2. See “Network Communications” above for more on network
architecture.
