Drive Module Serial Communications; Drive Module Installing Control Cables - Danfoss VTT Series Applications And Installation Manual

Drive Module Serial
Communications
Table 29
Control Terminals, RS-485
Serial Communication
Drive Module Installing
Control Cables
Figure 48
RS 485 and Interlock
Connection Details
Page 66 of 73
M-AI-VT-001-EN Rev.C.1
Controls Installation
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.
Terminal number
Terminal number 61
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
Use screened/armored cables to comply with EMC emission specifications.
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.
Control Terminal, RS-485 Serial Communication
68 (P,TX+, RX+), 69 (N,TX-, RX-)
Common for terminals 68 and 69
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.
NOTE
Cable C Details
Wire Color Terminal Number
Black 61
Green 68
White 69
Red 12
Blue 19
Silver Screw