Efb Electrical Installation - ABB ACH550 series User Manual

E-Clipse Bypass Configurations for ACH550 Drives

EFB Electrical Installation

The figure below shows the locations of the SW1 DIP switch and X2 terminals 26..30 on the E-Clipse
Bypass control board. The function and setting of this switch and wire terminal connection are
explained in the following section.
Warning! Connections should be made only while the bypass is disconnected from
the power source.
Bypass terminals 26...30 are for EIA 485 communications.
• Use Belden 9842 or equivalent. Belden 9842 is a dual twisted, shielded pair cable
with a wave impedance of 120 O.
• Use one of these twisted shielded pairs for the EIA 485 link. Use this pair to
connect all A (-) terminals together and all B (+) terminals together.
• Use both of the other wires in the other pair for the logical ground (terminal 29)
• Do not directly ground the EIA 485 network at any point. Ground all devices on
the network using their corresponding earthing terminals.
• As always, the grounding wires should not form any closed loops, and all the
devices should be earthed to a common ground.
• Connect the EIA 485 link in a daisy-chained bus, without dropout lines.
Serial Communications
Termination Resistors
SW1 (1-2)
ON=Terminated: Both SW1
Switch Positions (1-2) DOWN
OFF=Not Terminated: Both SW1
Switch Positions (1-2) UP
Serial Communications
X2-26...30
Embedded Fieldbus and Fieldbus Adapters
67