Appendix A – ACS/ACC/ACP 601 Technical Data
ACS/ACC/ACP 601 Frequency Converters A-13
Bus Termination Switch
When several NIOC boards are daisy-chained for common control from
external Modbus device, switch SW1 must be set to the OFF position
on the intermediate boards. See figure below. (SW1 is on the NIOC
board from October 1999.)
Settings of
Switch SW1
Function
Bus is not terminated
Bus is terminated (default)
OFF
OFF
NAMC
NIOC
on
off
NIOC
No 1
SW1
on
NIOC
No 2
SW1
OFF
NIOC
No 3
SW1
OFF
NIOC
No 4
SW1
on
Drive units at a common earth potential (e.g. installed in the same cabinet)
Note:
When drive units are not at a common earth potential, or long
distance connection is required, NBCI modules can be used. Refer of the
module manual.
X28
X29
Straight-through cable (Ident.: Grey)
(pin 1 to pin 1, pin 2 to pin 2, etc.)
RS 485
Modbus
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