![Siemens ST950 User Manual Download Page 69](http://html.mh-extra.com/html/siemens/st950/st950_user-manual_1265504069.webp)
ST950 Plus+ User Manual
ST950 Plus+ User Manual
Page 69 of 176
667/HE/53000/000
Issue 2
Unrestricted
3.17.2
Signals On/Off Switch
The lamp supply to the phase switch cards is removed immediately OFF is selected on the SIGNALS
OFF/ON switch, extinguishing the signals.
Safe Traffic Conditions
Care should be taken to ensure safe traffic conditions before operating the switch.
With the OFF position selected, normal microprocessor control operations continue, and the
phase selections being implemented can be observed on the Lamp Switch indicators.
Isolation of On Street Equipment
Switching the Manual Panel Signals On/Off switch to “Off” does not
provide isolation of the
equipment.
When the switch is returned to the ON position, the signals turn on as per the configured switch
on sequence.
3.17.3
Lamp Test Button
A button on the Manual Panel enables the indicators on the panel, including the Cabinet Alarm
Lamp, to be checked.
When the button is pressed, all LEDs on the Manual Panel should light. The lamp test is carried out
under software control, and although correct results indicate that the processor is communicating
with the Manual Panel, it does not guarantee that no faults are present.
3.17.4
Mode Select Buttons (Manual, VA, Fixed Time, Etc)
These keys select the required mode for the controller.
The controller can be configured so that manual mode is only available if a handset is plugged in.
An alternative configuration is such that manual mode may only be selected following a specific
handset command (see MND command).
3.17.5
Stage Select Buttons (All Red, 1 - 7)
With Manual mode selected (Manual LED lit), the keys ALL RED, 1 - 7 select the configured stage
(or combination of stages) provided the AWAITING COMMAND indicator is illuminated and a
prohibited stage move is not requested.