User´s Guide Power Rail Booster Version 12/2005
Copyright © Siemens AG 2005 All rights reserved. 6ES7 972-4AA02-0XA0 Page 29 of 49
6.3 Installation
6.3.1 Installing a PRB
A PRB can be mounted on a DIN EN 50022-compliant standard top hat rail with the
dimensions 35x15mm or 7.5x15mm. A PRB must be installed or removed only when
the supply voltage is switched off.
Æ
The PRB must be installed horizontally on a vertical wall as shown in Fig.
14.
All other installation positions result in derating to the permissible ambient
temperature. See Chapter 8 „Technical Specifications".
Æ The location must be selected to suit the ambient conditions and mechanical
limit values shown in the technical specifications.
Æ Sufficient space to connect all lines and cables must be available at the chosen
location. In order to ensure sufficient heat dissipation, a space of at least 15mm
must separate the upper corner of the PRB from the housing.
Æ Install the PRB only on a low-resistance and low reactance-grounded mounting
plate.
On/removing a PRB from a top hat rail
Æ Insert the upper locking hook on the PRB into the standard rail and press the
bottom surface against the rail until the PRB dicks into place.
Æ The PRB is removed by pulling the locking lever downward. With the lever held
down, the PRB can be simply lifted off the top hat rail.
Fig. 18: Installing a PRB on a standard top hat rail
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