MOVIDRIVE
®
MD_60A Operating Instructions
27
RS-485 interface connection
4.8
RS-485 interface connection
The RS-485 interface can be used for connecting max. 32 MOVIDRIVE
®
units, e.g. for
master/slave operation, or 31 MOVIDRIVE
®
units and a CAN machine control (PLC).
Wiring diagram, RS-485 interface
Cable specification
•
Use a 2-core twisted and shielded copper cable (data transmission cable with shield
comprising copper braiding). The cable must meet the following specifications:
– Conductor cross section 0.5 – 0.75 mm
2
(AWG 20 – 18)
– Cable resistance 100 – 150
Ω
at 1 MHz
– Capacitance per unit length
≤
40 pF/m (12 pF/ft) at 1 kHz
The following cable is suitable, for example:
– BELDEN (www.belden.com), data cable type 3105A
Shield contact
•
Connect the shield at either end to the electronics shield clamp of the inverter or the
machine control and ensure the shield is connected over a large area. Also connect
the ends of the shield to DGND.
Line length
•
The permitted total line length is 200 m (660 ft).
Terminating
resistor
•
Dynamic terminating resistors are fitted. Do not connect any external terminating
resistors!
02206AEN
Fig. 20: RS-485 connection
X13:
X13:
X13:
DGND
ST11
ST12
DGND
ST11
ST12
DGND
ST11
ST12
DIØØ
DIØ1
DIØ2
DIØ3
DIØ4
DIØ5
DCOM
VO24
DIØØ
DIØ1
DIØ2
DIØ3
DIØ4
DIØ5
DCOM
VO24
DIØØ
DIØ1
DIØ2
DIØ3
DIØ4
DIØ5
DCOM
VO24
9
10
11
9
10
11
9
10
11
1
2
3
4
5
6
7
8
1
2
3
4
5
6
7
8
1
2
3
4
5
6
7
8
RS-485 -
RS-485 -
RS-485 -
RS-485 +
RS-485 +
RS-485 +
Control unit
Control unit
Control unit
•
There must not be any potential displacement between the units which are
connected together using the RS-485. Take suitable measures to avoid a potential
displacement, e.g. by connecting the unit ground connectors using a separate lead.
Summary of Contents for MOVIDRIVE MD*60A Series
Page 3: ...MOVIDRIVE MD_60A Edition 09 2001 Operating Instructions 1053 2617 EN ...
Page 4: ...SEW EURODRIVE ...
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