![Page 1: ADT490 TroubleShooting Grounds. 2 Prior to Troubleshooting ‣ Before starting to work on the FACP, what do you do? 2](https://reader035.vdocuments.mx/reader035/viewer/2022062309/56649f4d5503460f94c6d6c4/html5/thumbnails/1.jpg)
ADT490 TroubleShootingGrounds
![Page 2: ADT490 TroubleShooting Grounds. 2 Prior to Troubleshooting ‣ Before starting to work on the FACP, what do you do? 2](https://reader035.vdocuments.mx/reader035/viewer/2022062309/56649f4d5503460f94c6d6c4/html5/thumbnails/2.jpg)
2
Prior to Troubleshooting
‣Before starting to work on the FACP, what do you do?
2
![Page 3: ADT490 TroubleShooting Grounds. 2 Prior to Troubleshooting ‣ Before starting to work on the FACP, what do you do? 2](https://reader035.vdocuments.mx/reader035/viewer/2022062309/56649f4d5503460f94c6d6c4/html5/thumbnails/3.jpg)
3
How to Use Ground LED
‣ Can use LED as tool -> which circuit has a ground fault by systematically removing circuits until ground fault LED turns off.
3
![Page 4: ADT490 TroubleShooting Grounds. 2 Prior to Troubleshooting ‣ Before starting to work on the FACP, what do you do? 2](https://reader035.vdocuments.mx/reader035/viewer/2022062309/56649f4d5503460f94c6d6c4/html5/thumbnails/4.jpg)
4
Finding Grounded Circuits
‣ Removing a circuit with a ground results in “ground fault” indicator LED turning off.
‣ CAUTION: There may be more than circuits with ground.
‣ For this reason, DO NOT replace circuit when removed -> may itself have a ground.
4
![Page 5: ADT490 TroubleShooting Grounds. 2 Prior to Troubleshooting ‣ Before starting to work on the FACP, what do you do? 2](https://reader035.vdocuments.mx/reader035/viewer/2022062309/56649f4d5503460f94c6d6c4/html5/thumbnails/5.jpg)
5
8 Zone System‣ Remove & carefully tag and removing each circuit.
‣ When we disconnect Zone 7, we get this:
5
![Page 6: ADT490 TroubleShooting Grounds. 2 Prior to Troubleshooting ‣ Before starting to work on the FACP, what do you do? 2](https://reader035.vdocuments.mx/reader035/viewer/2022062309/56649f4d5503460f94c6d6c4/html5/thumbnails/6.jpg)
6
Locating Actual Ground
‣ Check out the circuit arrangement on the floor
6
![Page 7: ADT490 TroubleShooting Grounds. 2 Prior to Troubleshooting ‣ Before starting to work on the FACP, what do you do? 2](https://reader035.vdocuments.mx/reader035/viewer/2022062309/56649f4d5503460f94c6d6c4/html5/thumbnails/7.jpg)
7
Locating Actual Ground
‣ Zone 7 is laid out as below:
7
![Page 8: ADT490 TroubleShooting Grounds. 2 Prior to Troubleshooting ‣ Before starting to work on the FACP, what do you do? 2](https://reader035.vdocuments.mx/reader035/viewer/2022062309/56649f4d5503460f94c6d6c4/html5/thumbnails/8.jpg)
8
Locating Actual Ground
‣ Straightened out it looks as below:
8
![Page 9: ADT490 TroubleShooting Grounds. 2 Prior to Troubleshooting ‣ Before starting to work on the FACP, what do you do? 2](https://reader035.vdocuments.mx/reader035/viewer/2022062309/56649f4d5503460f94c6d6c4/html5/thumbnails/9.jpg)
9
Locating Actual Ground‣ Disconnect to Zone 7 EOL
‣ Now only one conductors has ground contact
‣ Go back to FACP and disconnect positive wire.‣ Does the “Ground” LED turn off?‣ If it does, then ground contact is on positive wire
9
![Page 10: ADT490 TroubleShooting Grounds. 2 Prior to Troubleshooting ‣ Before starting to work on the FACP, what do you do? 2](https://reader035.vdocuments.mx/reader035/viewer/2022062309/56649f4d5503460f94c6d6c4/html5/thumbnails/10.jpg)
10
Locating Ground (Alternate Method)‣ Remove circuit from panel & measure positive conductor
‣ Resistance reading is value of conductor to ground + resistance value of raceway
10
![Page 11: ADT490 TroubleShooting Grounds. 2 Prior to Troubleshooting ‣ Before starting to work on the FACP, what do you do? 2](https://reader035.vdocuments.mx/reader035/viewer/2022062309/56649f4d5503460f94c6d6c4/html5/thumbnails/11.jpg)
11
Locating Ground (Alternate Method)‣ Remove circuit from panel & measure negative conductor
‣ Resistance reading is read through EOL = value of conductor to EOL + value of conductor to Ground + resistance value through raceway
11
![Page 12: ADT490 TroubleShooting Grounds. 2 Prior to Troubleshooting ‣ Before starting to work on the FACP, what do you do? 2](https://reader035.vdocuments.mx/reader035/viewer/2022062309/56649f4d5503460f94c6d6c4/html5/thumbnails/12.jpg)
12
Locating Actual Ground
‣ Note Zone 7 Trouble LED -> indicating an open circuit.
‣ It is open -> EOL is totally disconnected
‣ Positive wire at the FACP.
‣ Note that ground on the Zone 7 Initiating circuit did not cause the Zone 7 Trouble Led to turn on
12
![Page 13: ADT490 TroubleShooting Grounds. 2 Prior to Troubleshooting ‣ Before starting to work on the FACP, what do you do? 2](https://reader035.vdocuments.mx/reader035/viewer/2022062309/56649f4d5503460f94c6d6c4/html5/thumbnails/13.jpg)
13
Locating Actual Ground
‣ Step 2 – Finding the Grounded point with Boolean Search.
‣ With 2 technicians (technician & helper)
‣ one person on to 7th floor and other at FACP.
‣ Re-connect positive wire to positive terminal of Zone 7.
‣ The Ground Fault indication returns.
13
![Page 14: ADT490 TroubleShooting Grounds. 2 Prior to Troubleshooting ‣ Before starting to work on the FACP, what do you do? 2](https://reader035.vdocuments.mx/reader035/viewer/2022062309/56649f4d5503460f94c6d6c4/html5/thumbnails/14.jpg)
14
Locating Ground (2 Techs)
‣ The technician to the 7th floor, selects mid-point on circuit and opens circuit by removing a device ->
‣ Zone 7 Trouble is in Trouble(open) and Ground Fault are on with the System Trouble.
14
![Page 15: ADT490 TroubleShooting Grounds. 2 Prior to Troubleshooting ‣ Before starting to work on the FACP, what do you do? 2](https://reader035.vdocuments.mx/reader035/viewer/2022062309/56649f4d5503460f94c6d6c4/html5/thumbnails/15.jpg)
15
Locating Ground (1 Tech)
15
‣ Circuit disconnected from Panel
![Page 16: ADT490 TroubleShooting Grounds. 2 Prior to Troubleshooting ‣ Before starting to work on the FACP, what do you do? 2](https://reader035.vdocuments.mx/reader035/viewer/2022062309/56649f4d5503460f94c6d6c4/html5/thumbnails/16.jpg)
16
Locating Ground (1 Tech)
16
‣ Ground is between the TP and Panel
![Page 17: ADT490 TroubleShooting Grounds. 2 Prior to Troubleshooting ‣ Before starting to work on the FACP, what do you do? 2](https://reader035.vdocuments.mx/reader035/viewer/2022062309/56649f4d5503460f94c6d6c4/html5/thumbnails/17.jpg)
17
Locating Ground (2 Techs)‣ Next device removed as a Test Point is Hallway
smoke detector ->
17
![Page 18: ADT490 TroubleShooting Grounds. 2 Prior to Troubleshooting ‣ Before starting to work on the FACP, what do you do? 2](https://reader035.vdocuments.mx/reader035/viewer/2022062309/56649f4d5503460f94c6d6c4/html5/thumbnails/18.jpg)
18
Locating Ground‣ Next device removed is Hallway smoke detector ->
‣ According to panel technician, Ground Fault Led is off.
‣ Ground is between Hallway smoke detector and Fitness Room heat detector.
18
![Page 19: ADT490 TroubleShooting Grounds. 2 Prior to Troubleshooting ‣ Before starting to work on the FACP, what do you do? 2](https://reader035.vdocuments.mx/reader035/viewer/2022062309/56649f4d5503460f94c6d6c4/html5/thumbnails/19.jpg)
19
Locating Ground (1 Tech)‣ Next device removed is Hallway smoke detector ->
‣ Ground between smoke detector & Fitness Room heat detector.
19
![Page 20: ADT490 TroubleShooting Grounds. 2 Prior to Troubleshooting ‣ Before starting to work on the FACP, what do you do? 2](https://reader035.vdocuments.mx/reader035/viewer/2022062309/56649f4d5503460f94c6d6c4/html5/thumbnails/20.jpg)
20
Locating Ground (1 Tech)‣ Ground is toward the EOL
20
![Page 21: ADT490 TroubleShooting Grounds. 2 Prior to Troubleshooting ‣ Before starting to work on the FACP, what do you do? 2](https://reader035.vdocuments.mx/reader035/viewer/2022062309/56649f4d5503460f94c6d6c4/html5/thumbnails/21.jpg)
21
Locating Actual Ground‣ Step 3 – Verifying contact to Ground
‣ Section of circuit looks like “straight line”.
‣ There is a ground contact somewhere along this section of circuit wiring.
21
![Page 22: ADT490 TroubleShooting Grounds. 2 Prior to Troubleshooting ‣ Before starting to work on the FACP, what do you do? 2](https://reader035.vdocuments.mx/reader035/viewer/2022062309/56649f4d5503460f94c6d6c4/html5/thumbnails/22.jpg)
22
Locating Actual Ground
‣ Grounding point could be between Test Point and Party Room detector, or from Party Room detector onward.
‣ In Party Room, disconnect circuit leaving detector.
22
![Page 23: ADT490 TroubleShooting Grounds. 2 Prior to Troubleshooting ‣ Before starting to work on the FACP, what do you do? 2](https://reader035.vdocuments.mx/reader035/viewer/2022062309/56649f4d5503460f94c6d6c4/html5/thumbnails/23.jpg)
23
Locating Actual Ground
‣ Now our DMM displays this:
‣ There is no longer a circuit between wire and pipe.
23
![Page 24: ADT490 TroubleShooting Grounds. 2 Prior to Troubleshooting ‣ Before starting to work on the FACP, what do you do? 2](https://reader035.vdocuments.mx/reader035/viewer/2022062309/56649f4d5503460f94c6d6c4/html5/thumbnails/24.jpg)
24
Locating Actual Ground
‣ To confirm location of grounding point, connect DMM on wire in Party Room and take another reference with respect to ground.
24
![Page 25: ADT490 TroubleShooting Grounds. 2 Prior to Troubleshooting ‣ Before starting to work on the FACP, what do you do? 2](https://reader035.vdocuments.mx/reader035/viewer/2022062309/56649f4d5503460f94c6d6c4/html5/thumbnails/25.jpg)
25
endofpresentation