Additional information on the connections
￭
Power supply for the control unit (XPOW)
The control unit is powered from a 24 V DC, 2 A supply through terminal block XPOW.
With a type BCU control unit, a second supply can be connected to the same terminal
block for redundancy.
Using a second supply is recommended, if:
• the control unit needs to be kept operational during input power breaks, for
example, because of continuous fieldbus communication
• immediate restart is needed after a power break (that is, no control unit power-up
delay is allowed).
￭
DIIL input
The DIIL input is used for the connection of safety circuits. The input is parametrized
to stop the unit when the input signal is lost.
Note: This input is not SIL or PL classified.
￭
The XD2D connector
The XD2D connector provides an RS-485 connection that can be used for
• basic master/follower communication with one master drive and multiple
followers,
• fieldbus control through the embedded fieldbus interface (EFB), or
• drive-to-drive (D2D) communication implemented by application programming.
See the firmware manual of the drive for the related parameter settings.
Terminate the bus on the units at the ends of the drive-to-drive link. Disable bus
termination on the intermediate units.
Use a shielded twisted-pair cable for data, and another pair or a wire for signal ground
(nominal impedance 100…165 ohm, for example Belden 9842). For the best immunity,
ABB recommends high quality cable. Keep the cable as short as possible. Avoid
unnecessary loops and parallel runs near power cables such as motor cables.
Control units of the drive 89
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