Siemens EH.85M.21E Bedienungsanleitung PDF herunterladen (Seite 5)

ST800 Guidance Notes

Issue 1 667/HB/27000/100 Page 5

Self Test

The self test facility can be used to check the hardware fitted to the controller, even

without a configuration PROM fitted. It has been designed to be used in both the

factory by production and on the street by field services.

Self test is initiated by holding down the level 3 access button while switching the

controller’s power on. The button should be released once the green heartbeat LED

starts to flash.

The green heartbeat LED will continue to flash during the self test unless a fault is

detected when the red system error LED illuminates.

A 20 character by 4 line handset connected will display information about the checks

it is performing, such as the firmware issue and the lamp supply voltage, both dim

and bright, and detail any faults found.

Self test performs the checks detailed on the following pages and will report the error

messages shown if faults have been detected.

Resolving problems with lamp switch cards and triacs:

When various tests fail, the handset may display information such as:

V/Mons Off...Failed

← identifies the test which has failed

R-00000000+00000400

← outputs from the red voltage monitors

A-00000000+00000000

← outputs from the amber voltage monitors

G-00000400+00000000

← outputs from the green voltage monitors

The numbers are in hexadecimal notation and so each of the eight digits encodes

four phases and each possible combination of the four phases is encoded to a value

as follows:-

ZY XWVU TSRQ PONM LKJI HGFE DCBA

0 0 000400

0123456789ABCDEF

---- ---I --J- --JI -K-- -K-I -KJ- -KJI L--- L--I L-J- L-JI LK-- LK-I LKJ- LKJI

So in the above example, the voltage monitor for phase K red on the positive peak

and phase K green on the negative peak is stuck on, i.e. the second board is faulty.

General Lamp Switch Card Failures:

Should one of the general tests on the lamp switch cards fail, try repeating the self

test with only the first lamp switch card connected and then repeat this with each

board (and ribbon cable) in turn until the faulty card (or ribbon cable) is detected.

Note that it is possible that an obscure fault on one board, may cause a latter card to

appear faulty due to the nature of a ‘bus’ communications system.

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