Specifications

ST900 Family General Handbook
667/HB/32900/000 Issue 11 Page 163 of 265
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18.1 Manual Mode
For the “Manual Step-On” facility, see section 19.
Manual mode selected on the Manual Panel (see section 29.8) is recognised as a
mode for priority purposes. With the ‘MANUAL’ button pressed, manual mode will be
selected providing there are no operating conditions for a higher priority mode (see
section 12).
During Manual mode, only 7 stages and the all-red condition (normally stage 0) are
available to be selected by means of buttons on the Manual Panel.
No stage changes may be made until the last phase minimum green in the current
stage has timed off. When the controller is ready to accept a selection, the
‘AWAITING COMMAND’ indicator illuminates and any subsequent button selection
is actioned provided:
a) A prohibited stage move is requested.
b) The requested stage is not deleted by the master time clock.
If any of these conditions occur, the ‘PROHIBITED MOVE’ indicator illuminates. In
the case of (a) the stage can be selected via another stage change which is
allowed, e.g. to the all-red stage, but in the case of (b), the stage cannot be selected
until the master time clock inhibit is removed. Any phases deleted by the master
time clock will not be active during Manual mode. For control of non-fixed phases
during Manual Control see section 6.8.
Note that if the requested stage move is configured to move via an alternative stage,
that intermediate stage will run for just its minimum green times and then the
controller will move to the requested stage.
When Manual Mode ceases, demands may be automatically inserted for selected
non-running phases. These demands are normally inserted to ensure no vehicles
are trapped against a red light, unless otherwise requested by a customer.
18.2 Allocation of Stages to Buttons
The all-red stage (Stage 0) is always allocated to the ‘ALL RED’ button.
Up to 7 of the remaining stages may be allocated to any of buttons 1 to 7. Button
numbers would normally coincide with stage numbers although this is not
necessarily so.
If the stage allocated to one of the buttons is active, the indicator by the button on
the Manual Panel will illuminate. During the preceding interstage, the indicator will
flash.