Specifications

ST900 Family General Handbook
667/HB/32900/000 Issue 11 Page 236 of 265
3
3
5
5
S
S
E
E
L
L
F
F
-
-
T
T
E
E
S
S
T
T
F
F
A
A
C
C
I
I
L
L
I
I
T
T
Y
Y
Self-Test checks as much of the hardware as possible without the controller
requiring a configuration. It is a completely separate function provided by the
firmware with faults displayed on the handset directly. When the power is switched
off and back on again after the Self-Test, the normal operation of the traffic
controller is not affected in any way and continues as though nothing has happened.
With the controller powered off and at least the following cards fitted, the operator
would switch the power on while holding down the level 3 push-button until the
green heartbeat LED starts flashing.
The following hardware must be fitted:
 Power supply and distribution units (Mains MDU or ELV HPU/LPU).
 The main processor card.
 At least one Lamp Switch card with lamp supply connected.
The Self-Test Facility will test the following:
 Integrity of the processor card, e.g. RAM, PROMs, second processor, etc…
 Lamp Supply Relays and monitor the ZXO Signal.
 Lamp Output Switches and voltage monitors.
 Determines the ‘fail to blackout’ or ‘fail to flashing’ set-up of the controller.
The following items will be also checked if fitted:
 Serial I/O cards and Intelligent Detector Backplanes.
 An SDE/SA card.
 An integral TC12 OTU card.
 An integral facilities processor (integral OMU) card.
 Manual Panel buttons and LEDs.
The checks will be performed repeatedly until the power is switched off so that the
Self-Test can be used during a soak-test. During the tests, the heartbeat LED will
still flash to show that the Self-Test is running. If any problem is detected, the Self-
Test terminates and the firmware will attempt to indicate the nature of the fault on
the handset (always at 1200 baud 7 even).
For more information, refer to the ST900 Installation, Commissioning and
Maintenance Handbook.