Specifications
ST900 Family General Handbook
667/HB/32900/000 Issue 11 Page 218 of 265
30.1.2 Mode Select Push-Buttons
When the NORMAL mode select push-button is pressed, the highest priority mode
with operating conditions active will be the current mode and the NORMAL indicator
will be illuminated. If the mode running on all of the streams is VA, CLF or FIXED
TIME, that indicator on the manual will also be illuminated indicating that the
controller is running ‘normal VA’ for example.
Selection of either MANUAL, VA, CLF or FIXED TIME will illuminate the associated
indicator and cause the mode selected to become operational providing no higher
priority mode is active, see also section 12.1. If the mode selected is not running on
any of the streams, the indicator will flash. This may because a higher priority mode
is running temporarily, e.g. hurry call or start-up, in which case the mode may
become operative and the indicator stop flashing and remain on after a short delay.
30.1.3 Signals OFF/ON Switch
When the OFF position is selected the signal lamps will be extinguished
immediately regardless of their current state. While the signal lamps are
extinguished the controller will continue to function.
When the ON position is selected the signal lamps will be illuminated immediately at
whatever point the controller has reached, or go through a start-up sequence,
depending upon configuration.
30.1.4 Cabinet Alarm
The cabinet alarm illuminates when a DFM fault (see section 29.6) is confirmed or
flashes when a red lamp fault (see section 38.2) is confirmed. Special conditioning
can also illuminate the cabinet alarm.
30.1.5 SW1, SW2 and SW3 Push-Buttons
The function of these switches can be set up in configuration for such facilities as
Dim Override, DFM Reset or Part-time mode, etc. (see below).
SW1, SW2 and SW3 can be used to implement optional manual facilities such as:
Dim Override
DFM Reset
Part-time (Non UK only)
Signals Flash (Non UK only)
Alternative Maximum
Override Audio Signal
Diversion
30.1.6 Lamp Test Push-Button
The LAMP TEST push-button applies a signal that illuminates all indicators on the
Manual panel and illuminates the CABINET ALARM lamp for test purposes.