WEG MVW3000 A0040 V023, User Manual

Page: 111 / 125

MVW3000 | 9-23
9
Communication Networks
MVW3000 | 9-23
MASTER
Tx: (data)
RSND (request to send)
INVERTER
TxD: (data)
t
proc
t
di
t
txi
Figure 9.12: Time of the telegrams exchanged between Master and Inverter
Table 9.10: Reading and writing time
Time Typical (ms)
T
proc
10
T
di
5
T
txi
Reading 15
Writing 3
9.2.4 RS-232 and RS-485 Physical Connection
Network master
(PC,CLP)
MVW3000
Cable
shield
A B
11 12
A
B
XC4
(EBA)
A
XC5
(EBB)
B
A
B
XC4
(EBA)
A
XC5
(EBB)
B
MVW3000 MVW3000
Cable
shield
A B
11 12
Figure 9.13: Connection Scheme
Notes:
„
LINE TERMINATION: add a line termination (120 Ω) at the ends, and only at the ends, of the line. Therefore, set
S3.1/S3.2 (EBA) and S7.1/S7.2 (EBB) in the on position (refer to the
Item 7.2.1 EBA (I/O Expansion Board A) on
page 7-5 and Item 7.2.2 EBB (I/O Expansion Board B) on page 7-9 ).
„
CABLE SHIELD GROUNDING: connect them to the equipment frames (properly grounded).
„
RECOMMENDED CABLE: balanced pair, shielded.
„
E.g., AFS Line, manufacturer KMP.
„
The RS-485 network wiring must be separated from power cables and 110/220 V command.