Table of Contents
Advertisement
Trip Amplifier 2/209
Safety information
1
Safety information
Target group: experiences skilled electricians.
The trip amplifier must not be converted or altered in any way.
Device must be mounted outside hazardous areas.
Attention
When working on the trip amplifier always comply with national safety and accident
prevention regulations and the safety information contained in this manual. Safety
information is printed in italics like this paragraph and marked accordingly.
Attention
Screened cables are recommended for all wiring which leaves the building.
According to IEC 801-5 application class 0 analog inputs must not be subjected to high
energy pulses. In all other respects the unit fulfils IEC 801 to the more stringent
applications class 3.
Redundant analog inputs A and B should be fed from separate sources. The signals
must not differ by more than 5 % since the sister channels are continuously compared
with each other.
In safety applications front push buttons should not be incorporated in those parts of the
program which are relevant to safety. Trip settings should not be changed during
operation. Front push buttons can be locked by placing the jumper KEY in the LOCK
position. The push buttons will then only be used to read values sequentially rather than
alter them (protection against unauthorized changes).
Programs for safety applications should try and avoid conditional branches because this
would simplify the final approval test considerably. This could then be restricted to a
functional test concentrating on the reaction of outputs to input changes.
For safety applications relay outputs must be configured to be normally energized. After
a power down the device will restart automatically. For safety applications it is therefore
necessary to establish suitable external means to resume production in an orderly
fashion.
The serial data link is not a safety related part of the circuitry.
EN
3
Advertisement
Table of Contents
