ABB ACH550-BCR, User Manual

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2-28 ACH550 E-Clipse Bypass User’s Manual
Installation
Check E-Clipse Bypass jumpers and switches
The settings described in this section are factory set and, for most situations, do not
require adjustment. However, it is a good practice to review these settings to confirm
that they are appropriate for the configuration installed.
Jumper and switch locations
The figure below shows the locations of the SW1 DIP switch on the E-Clipse Bypass
control board. The function and setting of this switch is explained in the following
paragraph.
DIP switch settings
The DIP switch is used to configure the serial communications termination resistors.
To reduce noise on the serial communications network, terminate the EIA-485
network using 120 ohm resistors at both ends of the network. Use the DIP switches
to connect or disconnect the on-board termination resistors. Both switches must be
positioned in the ON or OFF position to correctly configure the termination resistors.
Circuit breaker settings
On some ACH550 E-Clipse Bypasses, the circuit breaker has adjustable settings for
instantaneous current protection. The factory default settings are practical for most
applications. Refer to the “ABB SACE Instruction Sheet” (supplied with these units)
for additional information on the adjustment of these settings.
Serial Communications
Termination Resistors
SW1
ON=Terminated
OFF=Not Terminated
Factory
installed
jumpers
Hooked wire
race tie points