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audible connections either inside or outside the cabinet. Reconnect each audible
one at a time to find the faulty one. The module is protected indefinitely against
short-circuits on the output and will not be damaged.
Short INH+ to INH- with wire. If the PP LED illuminates (and audibles sound) when
the LSLS output is on, suspect a faulty connection between the audible module and
the I/O card or a faulty controller configuration causing the I/O card to inhibit the
audible module or a faulty I/O card.
If the PP LED on the module does not illuminate and the audibles do not sound with
INH+ and INH- shorted together, then measure the voltage across the "LSLS OP"
and "LSLS RET" pins of the connector. This should be at lamp supply potential (-
48V DC or -27.5V DC) when the module is being driven. If not, then suspect the
connection between LSLS and the module or the controller configuration or faulty
LSLS output.
Finally, having shown that the module is getting power from the LSLS output AND
that the inhibit is shorted to enable operation AND that there isn't a short-circuit on
the audible output, replace the module and re-test.
10.2.9 Audible Driver Module – Dual Output type
The green PP LED on the Audible Driver Module will only illuminate when the
audible indicators are being driven. This will only occur when the LSLS output is on
(i.e. -48V DC) AND the EN+ and EN COM connections on the module are shorted
together AND the output is not short-circuited. If link R40 is fitted, both Loud and
Quiet PP LEDs will illuminate, but if link R40 is cut, only one LED should light. This
would be the Loud PP LED if LQ+ is open circuit, or Quiet if LQ+ is shorted to LQ
COM.
If link R40 is cut and a single green PP led is ON but the audibles are not sounding,
check that audibles are connected to the correct outputs – loud or Quiet. If this is
correct, or link R40 is still fitted, check the polarity of the audible connections to the
module and re-test. Measure across the "O/P +" and "Audible COM" connections of
the module - the module will present approximately 12V DC when driving the
audibles. If this is present, then suspect the connection between the module and
the audibles and check that the audibles are not faulty by substituting a known
working audible.
Note that when the Special Condition code for audible monitoring is included, the
monitoring function must be enabled (typically using CFE6=1) in order to enable the
audible output. If monitoring is not enabled, there will be no audible output and the
green PP LEDs will not light.
With monitoring enabled, faults in the circuit such as output short circuit will trigger a
system error, which will extinguish all the signals (with fault 'SCF1' in the fault log).
If this occurs, before conducting the fault tests described below, it would be
necessary to temporarily short 'EN+ to 'EN COM' with a wire link. Audible
monitoring would then need to be disabled for the duration of the fault-finding tests
below (e.g. CFE6=0).
Security classification
Unrestricted
Version
7
Last Editor
manpreet.jeerh
Document Name
ST950 ICM Handbook
Copyright © Siemens plc 2020. All Rights Reserved.
All manuals and user guides at all-guides.com
Mobility is a division of Siemens Plc
Mobility, Intelligent Traffic Systems
Sopers Lane, Poole, Dorset, BH17 7ER
Page
120 of 154
Status
Issued
Date
January 2020
Document No.
667/HE/45950/000
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