System Manual – MOVIDRIVE® compact Drive Inverters
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Installing the system bus (SBus)
Installation
Cable
specification
•
Use a 2-core twisted and shielded copper cable (data transmission cable with
braided copper shield). The cable must meet the following specifications:
– Core cross section 0.75 mm
2
(AWG 18)
– Line resistance 120
Ω
at 1 MHz
– Capacitance per unit length
≤
40 pF/m at 1 kHz
Suitable cables include CAN bus or DeviceNet cables.
Shielding
•
Connect the shield at both ends to the electronics shield clamp of the inverter or the
master controller and ensure the shield is connected over a large area. Also connect
the ends of the shield to DGND.
Cable length
•
The permitted total cable length depends on the baud rate setting of the SBus
(P816):
– 125 kbaud
→
320 m
– 250 kbaud
→
160 m
– 500 kBaud
→
80 m
– 1000 kbaud
→
40 m
Terminating
resistor
•
Switch on the system bus terminating resistor (S12 = ON) at the start and end of the
system bus connection. Switch off the terminating resistor at the other devices
(S12 = OFF).
STOP!
There must not be any potential displacement between the units connected with the
SBus. This can restrict the functionality of the units.
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 compact MCH41A
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