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March 2021
Page 103 of 143
59812-K007 Rev 17
Business Confidential
Figure 155
Engine Status Screen Watchdog Fault
Identify the fault being indicated, in this case a Control Unit Watchdog fault.
Alternatively, an inspection of the engine event log, see section 3.6, will list the event:
Controller Watchdog
Engine X
Having established which Control Unit is in fault the following steps should be followed.
1.
Examine the Event Log to establish the frequency at which the Controller Watchdog is occurring.
If multiple Controller Watchdogs are recorded in the event log go to item 2
If a single Controller Watchdog is recorded in the event log Accept and Reset the Control Unit to
clear the fault. No further action is required.
2.
Examine the Control Unit System Test Log, see section 5.3. Check the Control Unit power supply
voltage on each record. The average power supply voltage should be within the specified Control
Unit operating voltage, see section 1.3. The peak to peak voltage variation should be less than 1.2v.
If the voltages recorded in the System Test Log are not within the specification go to item 3
If the voltages recorded in the System Test Log are within the specification the Control Unit PCB
should be replaced.
3.
Examine the power supply cable to the Control Unit ensuring that:
a.
Screened cable has been used
b.
The cable screen is connected to the SCN terminal of Supply Input terminal block.
If the cable is fitted correctly the power supply used for the Control Unit should be examined
and if necessary changed.
If the cable is not fitted correctly, change the cable connections to conform with this installation
manual, see section 2.7.1.
5.2.5.2
Control Unit software not restarted
If the software fails to restart the following indications will be observed:
Detector
The fault LED will be on for all detectors.
Control Unit
Activation of the Fault Relay
Control Unit with membrane
Fault indicator on constant
Remote Display Unit
The display will show a loss of communication with the
Control Unit, see Figure 149
The Control Unit PCB has failed and should be replaced.
Содержание Graviner Mk7
Страница 26: ...March 2021 Page 15 of 143 59812 K007 Rev 17 Business Confidential Figure 10 Detector Head Installation ...
Страница 42: ...March 2021 Page 31 of 143 59812 K007 Rev 17 Business Confidential Figure 29 Wiring Drawing ...
Страница 129: ...March 2021 Page 118 of 143 59812 K007 Rev 17 Business Confidential 6 6 1 CONTROL UNIT Figure 182 Control Unit Spares ...
Страница 149: ...March 2021 Page 138 of 143 59812 K007 Rev 17 Business Confidential ...
Страница 152: ...March 2021 Page 141 of 143 59812 K007 Rev 17 Business Confidential ...