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M-AI-VT-001-EN Rev.C.1
M-AI-VT-001-EN Rev.C.1
Controls Installation
Drive Module Serial
Communications
RS-485 is a two-wire bus interface compatible
with multi-drop network topology.
Terminate each segment at both ends, using the
termination switch (S801) of the drive module.
Always use screened twisted pair (STP) cable
for bus cabling, and always follow established
installation practices.
Low-impedance earth (ground) connection
of the screen at every node is important.
Therefore, connect a large surface of the screen
to earth (ground), for example with a cable clamp
or a conductive cable gland. It may be necessary
to apply potential-equalizing cables to maintain
the same earth (ground) potential throughout
the network, particularly in installations with
long cables.
Table 29
Control Terminals, RS-485
Serial Communication
Control Terminal, RS-485 Serial Communication
Terminal number
68 (P,TX+, RX+), 69 (N,TX-, RX-)
Terminal number 61
Common for terminals 68 and 69
Cable C Details
Wire Color
Terminal Number
Black
61
Green
68
White
69
Red
12
Blue
19
Silver
Screw
A cable harness consisting of RS-485
communications and the interlock is shipped
with the compressors which is connected to the
CCM card at one end. The othe end needs to be
connected to the drive module control board.
Figure 48 provides connection details of each
color coded wire to the corresponding terminal
on the control board.
Drive Module Installing
Control Cables
Figure 48
RS 485 and Interlock
Connection Details
61
68
69
39
42
50
53
54
12
13
18
19
27
29
32
33
20
37
55
NOTE
Use screened/armored cables to comply with EMC emission specifications.
