Comfort Automation/ Security System Forums > Support > Problems & Troubleshooting > vulnerability? Power short causes system hang |
Comfort Automation/ Security System Forums > Support > Problems & Troubleshooting > vulnerability? Power short causes system hang |
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richylloyd Member
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I have a number of long range, external PIR's that handle external lighting and 'arriving home' scenarios. When installing the PIRs, I inadvertently shorted the power supply which froze up the main Comfort board. I needed to remove all power to the board to get it functional again. My concern is that some of the PIRs are readily accessible and do not have any tamper mechanisms meaning that the system is potentially vulnerable. Can someone please help me undrestand how Comfort should be responding to a power short? Will it be different if the system is armed or not? My workaround is to drive these PIR's off a separate 12V power supply but this doesn't lessen my concerns for the system vulnerability. |
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slychiu Administrator 
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A short on the 12V supply should cause the resettable fuse to open so the external 12V to the PIR should be lost but the controller should still have power Does your system have a 12V backup battery? |
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richylloyd Member
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Thanks for the response. yes, I have a backup battery. I had to remove the main fuse as well as the battery lead to reset the system. If there is a time delay for the resettable fuse to kick back in, I haven't found what it is (took 5 mins from removing the short to finding the method for resetting the syem). What is the expected impact to the keypads as that is really where I saw the issue play out? Could it be that the main board was actually running and just waiting to return to a normal state? I will test this again today to ensure it is not just a misunderstanding of the system reaction. |
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slychiu Administrator
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A short circuit on 12V should cause the resettable fuse to open within a few seconds, provided a backup batery is connected. When the resettable fuse opens the 12V will not be available to keypads or other devices The rest of the alarm will still operate You do not need to remove the batery and fuse to reset the system There is a reset button on the Comfort PCB You can also send the reset command from Comfigurator |
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richylloyd Member
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Many thanks for your help I haven't managed to reproduce the problem since and shorting the power supplies has not reproduced my previous experience. With the knowledge of how the system should behave, I will just await a repeat event and test appropriately. |
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