26
Manual – Controllers DHE/DHF/DHR21B (standard) and DHE/DHF/DHR41B (advanced)
4
Installing the DH.21B/41B option
Assembly and Installation Notes
Cable length • The permitted total cable length depends on the baud rate setting of the system bus:
– 125 kBaud → 500 m
– 250 kBaud → 250 m
– 500 kBaud → 100 m
– 1000 kBaud → 40 m
Terminating
resistor
• Switch-on the system bus terminating resistor at the start and end of the CAN system
bus connection (MOVIDRIVE
®
B, DIP switch S12 = ON; MOVITRAC
®
B, DIP switch
S1 = ON). For all other devices, switch off the terminating resistor (MOVIDRIVE
®
B,
DIP switch S12 = OFF; MOVITRAC
®
B, DIP switch S1 = OFF). For example, if the
DH.21B/DH.41B option is located at the end of the CAN 2 system bus, you have to
connect a terminating resistor of 120 Ω between pins X32:2 and X32:3 (for CAN 1:
terminating resistor between pins X33:2 and X33:3).
4.7.4 RS485 interface connection (X34)
You can connect one of the following units to each of the RS485 interfaces COM1/2
(terminal X34).
• DOP11B operator terminal
• MOVIMOT
®
gearmotor with integrated frequency inverter
NOTICE
•There must not be any potential displacement between the units connected via
CAN 2 system bus.
•There must not be any potential displacement between the units connected via
CAN 1 system bus.
• Take suitable measures to avoid potential displacement, such as connecting the
unit ground connectors using a separate cable.
NOTICE
• There must not be any potential displacement between the units connected via
RS485. Take suitable measures to avoid potential displacement, such as
connecting the unit ground connectors using a separate cable.
• Dynamic terminating resistors are installed. Do not connect any external
terminating resistors.
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