26
MOVIDRIVE
®
MD_60A Operating Instructions
System bus (SBus) connection
4.7
System bus (SBus) connection
Max. 64 CAN bus stations can be interconnected using the system bus (SBus). The
SBus supports transmission systems compliant with ISO 11898.
The "System Bus (SBus)" manual contains detailed information about the system bus.
This manual can be obtained from SEW.
SBus wiring diagram
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 0.75 mm
2
(AWG 18)
– Cable resistance 120
Ω
at 1 MHz
– Capacitance per unit length
≤
40 pF/m (12 pF/ft) at 1 kHz
Suitable cables are CAN bus or DeviceNet cables, for example.
Shield contact
•
Connect the shield at either end to the electronics shield clamp of the inverter or the
master 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 cable length depends on the baud rate setting of the SBus
(P816):
– 125 kbaud
→
320 m (1056 ft)
– 250 kbaud
→
160 m (528 ft)
– 500 kbaud
→
80 m (264 ft)
– 1000 kbaud
→
40 m (132 ft)
Terminating
resistor
•
Switch on the system bus terminating resistor (S12 = ON) at the beginning and end
of the system bus connection. Switch off the terminating resistor on the other units
(S12 = OFF).
02205BEN
Fig. 19: System bus connection
X11:
REF1
AI11
AI12
AGND
REF2
1
2
3
4
5
X12:
DGND
SC11
SC12
1
2
3
S 12
S 11
ON OFF
X11:
REF1
AI11
AI12
AGND
REF2
1
2
3
4
5
X12:
DGND
SC11
SC12
1
2
3
S 12
S 11
ON OFF
X11:
REF1
AI11
AI12
AGND
REF2
1
2
3
4
5
X12:
DGND
SC11
SC12
1
2
3
S 11
S 12
ON OFF
y
y
y
y
Control unit
Control unit
Control unit
System bus
ref.potential
System bus
ref.potential
System bus
ref.potential
System bus high
System bus high
System bus high
System bus low
System bus low
System bus low
System bus
Terminating resistor
System bus
Terminating resistor
System bus
Terminating resistor
•
There must not be any potential displacement between the units which are
connected together using the SBus. Take suitable measures to avoid a potential
displacement, e.g. by connecting the unit ground connectors using a separate lead.
Содержание MOVIDRIVE MD*60A Series
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