AES 7170 Instrukcja Użytkownika Pobierz pdf (Strona 56)

40-7705I-UM Page 56 Rev 4 March 16, 2007

8.3 Special Purpose Circuits:

Listed below are some of the notable special purpose circuits whose purpose is to

monitor certain faults or the proper operation of the MultiNet Receiver.

1- Watchdog Timer / Hung process detection

2- Power Supply Overheating Detection

1- Watchdog Timer / Hung process detection: Many of the critical programs

in the MultiNet Server suite are providing a pulse to a Watchdog circuit on the

LCD Board. The purpose of this pulse is to verify that the programs are

performing their functions in a timely manner and not hung.

To test for the existence of an operational Hard Drive, many of the programs

are accessing the drive at regular intervals. If a program becomes hung for

any reason including its inability to access the drive, the Watchdog Circuit

will not receive the pulse. If the Watchdog circuit does not receive a pulse,

the MultiNet Receiver will annunciate the fault within 90 seconds.

To annunciate this fault condition, which includes a lost or failed hard disk

drive, the following will occur:

• At about 1 minute the LCD will display the message:

“COMM FAILED”

”VERSION ####”

• At about 90 seconds:

o The Alert Sounder will activate

o The CPU and Alert LED will illuminate

Pressing the Silence Button should silence the Alert Sounder.

If the Acknowledge Button is pressed, the LEDs will clear but the fault will be

re- annunciated in several seconds. This fault cannot be acknowledged.

Although it is possible that the MultiNet Receiver may continue to process

signals for some period of time, total failure is imminent and corrective action

must be taken. Never continue to operate the MultiNet receiver when the

Alert LED cannot be cleared.

2- Power Supply Overheating Detection: A temperature sensor is incorporated

into the power supply. If it detects a temperature above its normal operational

range, the following will occur”

• The Alert Sounder will activate

• The Silence and Acknowledge Buttons will have no affect on the

Sounder.

Although it is possible that the MultiNet Receiver may continue to function

normally and process signals for some period of time, failure is possible and

corrective action must be taken. Never continue to operate the MultiNet

receiver when the Sounder is active and cannon be silenced.

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AES 7170 Instrukcja Użytkownika Strona 56