TECHNICAL NOTE – OPERATION OF MT4000 TWTA
10/24/03
TN4000-3
MCL, INC.
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3.2.15 Fault & Alarm Display
The fault & alarm display screen automatically becomes active whenever a fault or alarm occurs
or when the TWTA is put into Local Override. This screen will capture the four most recent
faults and alarms that occur at the same time.
After a fault reset, if all faults are cleared, the fault & alarm display will be cleared and the
normal operating screen will be displayed. However, if the Accept button were pressed while
this screen is presented the fault & alarm display will be cleared and the normal operating screen
will be displayed, but no faults or alarms will be cleared.
4.0 HPA
OPERATION
4.1
HPA Control Modes
The MT4000 will be designed to provide continuous status to multiple interfaces all at the same
time. However, only one of these interfaces may control (these control modes are mutually
exclusive) the operational states of the MT4000 at any one time. These interfaces are the Local
panel, Remote Interface (J4), and Computer Interface (J5).
4.1.1 Local
Control
While the HPA is in the Local mode the operator at the Local panel will be allowed to control the
HPA. While in the Local mode the Remote & Computer serial interfaces cannot change the
operating state of the HPA, but they can still get status. From the Local panel the operator can
pass control to or take control away from the Computer or Remote panel.
4.1.2 Remote
Control
4.1.2.1 Control Priority
While the HPA is in the Remote mode the operator at the Remote panel or device on the remote
interface will be allowed to control the HPA. While in the Remote mode the Local panel or
Computer Interface cannot change the operating state of the HPA, but they can still get status.
From the Remote panel the operator can pass control to or take control away from the Computer
interface. For safety reasons, at no time can the Remote interface take control away from the
Local panel.
