:
i) Positive to earth resistance is greater than 1M
Ω
ii) Negative to earth resistance is greater than 1M
Ω
iii) Positive to negative resistance is greater than 1M
Ω
5. Place a short circuit across the ends of the loop and alarm circuits. Measure the
resistance across the positive and negative cables of each of the circuits and ensure
that the value does not exceed the calculated value. Remember to remove the short
circuits after the tests.
6. Correct polarity throughout all circuits must be maintained. Rectify any faults.
7. All bells, detector heads and call points should now be connected and alarm
circuit end-of-line resistors fitted. Use the spare end-of-line resistors supplied and
leave the EOL resistors in the panel terminals at this stage. Be very careful to
maintain correct polarity at each device.
9.5Commissioning Procedure
9.5.1Alarm Circuits
After completion of the pre-commissioning wiring check, this procedure should be
followed:
1. Remove the resistor from the first alarm circuit terminal and connect the first
alarm circuit wiring to the terminals, observing correct polarity. Check that any
alarm fault indications clear after a few seconds.
2. Press the “Evacuate” switch. Check that all sounders connected to the alarm
circuit operate.
3. Press “Silence Alarms” and “Reset”
.
Repeat steps 1 to 3 for the second and any subsequent alarm circuits.
9.5.2Commissioning Loops
1. Ensure that the control panel is switched off.
2. Ensure that all loop isolators are fitted and wired correctly. Any isolator connected
with reverse polarity will cause a short circuit condition at the previous isolator.
WARNING: If the isolator polarity is found to be incorrect, it is absolutely essential
that the polarity is corrected at each termination point throughout the wiring.
Failure to observe this will result in the polarity of the return end of the cable
becoming incorrect with the possibility of damage to the control panel.
3. Insulate and physically protect the positive and negative ends of one end of the
detection loop wiring. Connect the other end of the wiring to the panel terminals
O1+ and O1- for loop 1.
4. Switch on the control panel. Note that the panel will indicate a line fault condition
for all loops which are not connected. This can be ignored at this stage.
5. Configure the loop 1 devices as described in 24.4 on page 82. After the
configuration period, the panel will report the numbers of the different types of
sensors. If the numbers and types of sensor agree with the physical check already
carried out, proceed to the next stage.
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