Siemens ST950 Handbook page 145

If any of the voltage monitors appear to be detecting voltages, it would imply that
those LSLS Outputs are stuck ON (short circuit) and thus that LSLS card should be
replaced. See section 11.6 for details of this format of error message.
In the above example, LSLS #2 should be replaced because the eight digits after
the card number are not all zeroes; one or more outputs ON. LSLS #1 appears ok
because the eight digits are all zeroes; all outputs OFF.
L/Supply Failure
LSLS not on..----21
No lamp supply has been detected on the LSLS Cards identified. Check the lamp
supply circuit's relays, fuses, etc., in and around the HPU.
Relay A Fault
Relay B Fault
Failure of any of the relay tests implies that the relay is not switching off, i.e. that it
is either stuck closed or the control signals from the CPU Card are stuck active.
Relay A HFF Fault
This fault indicates a problem with the Hardware Fail Flash set-up of the controller:
Only one LSLS Card has been found, but the link on the HPU appears to be set-up
for HFF, i.e. Relay A did not switch off the lamp supply to LSLS#1.
More than one LSLS Card has been found and the link of the HPU appeared to be
set-up for HFF, but Relay A has switched off the lamp supply to LSLS#1.
Dim L/Supply=48V
Dimming Fault
A fault is only detected with the dimming relay if the dim lamp supply is more than
75% of the normal lamp supply, i.e. that the dimming relay seems to have no effect
on the lamp supply. If dimming is not required, then the dim and bright lamp
supplies must not be connected together. If dimming is configured as not present,
i.e. KDP is set to zero, then the controller simply never attempts to switch to dim.
Note that this test does not fail if there is no dim lamp supply. Therefore, the dim
voltage should be checked manually.
Relay A Fault or
HPU2 selects HFF
(only select HFF
On HPU1, not HPU2)
Two LSLS cards remained powered.
Relay A Fault:
LSLS 3 not
Switched off
Three or more LSLS cards remained powered.
Security classification Unrestricted
Version 7
Last Editor manpreet.jeerh
Document Name ST950 ICM Handbook
Copyright © Siemens plc 2020. All Rights Reserved.
Mobility, Intelligent Traffic Systems
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Page
Status
Date
Document No.
Mobility is a division of Siemens Plc
145 of 154
Issued
January 2020
667/HE/45950/000