REF 542plus switchbay protection and control unit
Manual Part 3: Installation and Commissioning
1VTA100004-en DMS,2001-10-04
REF542
plus
: Installation and Commissioning
12 / 80
4 Mounting and Installation
In this chapter you will find information:
on what to do first on delivery of the REF542
plus
the requirements for the installation location and the environmental conditions,
how to set up the REF542
plus
and integrate it into the bay and
how to check the wiring to run the commissioning process.
4.1
Unpacking
The REF542 bay control and protection unit does not require special shipping protec-
tion. The packaging is adapted for the shipping type and destination. Please proceed
as follows:
Visually inspect the unit and the packaging when unpacking it.
Any shipping damage found in the packaging or the unit should be reported immedi-
ately to the last shipper, who should be informed in writing of liability for the damage.
Check the delivery for completeness using the order documentation.
If there is anything missing or any discrepancies with the order documentation, con-
tact the ABB sales office immediately.
Mount the unit as described in the following section. If the unit is not for immediate
use, store it in a suitable place in its original packaging.
4.2
Mounting
The REF542
plus
consists of two parts, a Central Unit and a separate Human Ma-
chine Interface (HMI) as the Control Unit. The Central Unit contains the power supply,
processor and analog and binary Input and Output (I/O) modules, as well as optional
modules for supplementary functions. The HMI Control Unit is a stand-alone unit with
its own power supply. It can be installed on the Low Voltage (LV) compartment door
or in a dedicated compartment close to the Central Unit. The HMI is normally used to
set the protection parameters and to locally operate the switching devices in the
switchbay. An isolated and shielded twisted pair according to the RS485 standard in-
terface shall be used for the connection of the HMI as the Control unit to the Central
Unit.
