Faraday LW401, Руководство по эксплуатации, установке и обслуживанию

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LW-401 Operation, Installation, and Maintenance Manual LW-401
TABLE 5 TABLE 5
TABLE 5 TABLE 5
TABLE 5
FIELD WIRING CHECKOUT PROCEDURE FIELD WIRING CHECKOUT PROCEDURE FIELD WIRING CHECKOUT PROCEDURE FIELD WIRING CHECKOUT PROCEDURE FIELD WIRING CHECKOUT PROCEDURE
MEASURE RESISTANCE BETWEEN
TERMINAL AND TERMINAL
DESIRED
RESULTS
PROBABLE CAUSE IF
RESULTS DIFFER
Meter connection for Field Wiring Checkout Procedure Steps 1 and 2:
Positive lead connected to BL1-1 or BL2-1 and negative lead connected to BL1-2 or BL2-2.
1. Measure Notification Appliance Circuit Loop Resistance
Before making resistance measurements, short the End of Line Resistor (10K ohms).
BL1-1
BL2-1 BL1-2
BL2-2 <3.0 ohms
<3.0 ohms Line open
Line too long
2. Measure Notification Appliance Circuit End of Line Resistance
Before making resistance measurements, remove the short from the previous step.
BL1-1
BL2-1 BL1-2
BL2-2 10K ohms
10K ohms Line shorted; Line open
Wrong End of Line Resistor value
NAC Device wired backward
NAC Device not polarized
3. Check for Ground Fault
BL1-1
BL1-2
BL2-1
BL2-2
To all other Main Control module
terminals excluding NAC 1
To all other Main Control module
terminals excluding NAC 2
> 1 megohm
> 1 megohm
Line shorted
Line shorted
Meter connection to Field Wiring Checkout Procedure Steps 4, 5, and 6:
Positive lead connected to IDC + and negative lead connected to IDC -. Do not connect initiating devices to the
ID loop for resistance measurements in Field Wiring Checkout Procedure Steps 4, 5, and 6.
4. Measure Initiating Device Circuit Loop Resistance
Before making resistance measurements, short the End of Line Resistor (3.9K Ohms).
IDC1 +
IDC2 +
IDC3 +
IDC4 + IDC1 -
IDC2 -
IDC3 -
IDC4 - < 25 ohms
< 25 ohms
< 25 ohms
< 25 ohms Line open; Line too long
5. Measure Initiating Device Circuit End of Line Resistance
Before making resistance measurements, remove the short from the previous step.
IDC1 +
IDC2 +
IDC3 +
IDC4 + IDC1 -
IDC2 -
IDC3 -
IDC4 - 3.9K ohms
3.9K ohms
3.9K ohms
3.9K ohms Line shorted; Line open
Wrong End of Line Resistor value
6. Check for Ground Fault
IDC1 +
IDC2 +
IDC3 +
IDC4 +
IDC1 -
IDC2 -
IDC3 -
IDC4 -
To all other Main Control module
terminals excluding the IDC -
To all other Main Control module
terminals excluding the IDC +
> 1 megohm
> 1 megohm
Line shorted
Line shorted