27
9938
20
15-06
22
Trip Amplifier 2/208
Maintenance and Service
EN
5
Maintenance and Service
5.1
Maintenance
Only high-quality components are used. If you normal operate and pay attention to the
installation remarks, no periodical maintenance is necessary. The long-term stability of
these appliances means that an annual check of the zero point and the full scale value
is sufficient. The relay´s life time must be observed (see technical data sheet).
5.2
Service information
If doubtful measuring results are achieved, the correct state of all external connecting
parts and the output load must be checked. Make sure, that there is no overload.
Check the fusible elements. The fuse is marked by its rated value and the covering
sheet is also marked.
It is a fuse regulated in IEC 127-3, 250 V with the following rated value:
F1 = 400 mA, inert
When replacing components, always use new components of the same quality.
If there are any other faults, a laboratory standard test must be carried out. If reserve
appliances are available, we recommend that the faulty appliance is given to our
service department for inspection or for any repairs.
6
Safety Concept
The appliances are developed on base of lots of safety rules. Hardware and software
fulfil that catalogue of safety criterion. This trip amplifier is developed for standard
applications. The sister-type 2/209 is available with TÜV certificate for safety
applications in category SIL3 according to IEC 61508.
The configurable appliances have remarkable advantages in comparison to
conventional trip amplifiers:
•
Continuous comparation of the analogue inputs with the reference values
(conventional not possible).
•
Self-monitoring with dynamical dead man´s circuit) (conventional not possible).
•
Non-volatile EEPROM for data storage. Storage of operating system with EPROM
(conventional not possible).
•
Check-back signal for relay status and continuous supervision of the coils as well
as forced disconnection per watchdog (conventional not possible).
•
Simple RAM-test to check the store.
•
Lock against operations from outside (conventional not possible).
•
A fault switches into safe status.
•
CE declaration from manufacturer.
Technical changings possible.
536737.book Seite 22 Montag, 1. Juni 2015 10:19 10
