ABB ACS580-01 - Page 120

120 Electrical installation
Switches
Switch Description Position
S4
(TERM)
Modbus link termination. Must be set to the
terminated (ON) position when the drive is
the first or last unit on the link.
Bus not terminated
(default)
Bus terminated
S5
(BIAS)
Switches on the biasing voltages to the
bus. One (and only one) device, preferably
at the end of the bus must have the bias
on.
Bias off (default)
Bias on
TERM
ON
TERM
ON
BIAS
ON
BIAS
ON