Nexus 21 A1557 - Manual (Page 22)

Document Ref: Nex8inst.doc/Rev0 09.07.00 Page 22 of 30 Originator MC Checked by AC__
(i)
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.
(ii) Press the “Evacuate” switch. Check that all sounders connected to the alarm circuit
operate.
(iii)
Press “Silence Alarms” and “Reset”.
(iv)
Repeat steps (5.4.1) to (5.4.3) for the second and any subsequent alarm circuits.
6.4.2 Commissioning
Loops
NOTE:
The pc down-load facility may be used at any stage up to Section (v).
(i)
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 LO+
and LO- for loop 1.
(ii)
Enter the engineers test mode at level 2 and select option 4 (Configure). 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 (iv).
(iii)
If double addressing of detectors is found on the loop, the LCD display will show a
report of the device numbers affected. The engineer may also notice a device missing
from the expected total quantity of loop devices.
(iv) When all required sensors have been configured, select engineer’s Option 5: STATUS
and using the STATUS DISABLED option, interrogate the devices on an individual
basis. To view correct electronic operation, press button for command bit 2 (self test
mode). Press again to return detector to quiescent state. To turn a device LED on (to
identify its correct location), press button for command bit 3. Press again to return
detector to quiescent state. To turn a remote device LED on (to identify its correct
location), press button for command bit 1. Press again to return detector to quiescent
state.
(v) Repeat sections (i) to (iv) for each loop.
(vi)
Sensor installation is now complete and the return end of the detection loop may now
be connected to the LI+ and LI- terminals.
WARNING: Before connecting, ensure that the returning polarity is correct.
The final phase of the sensor commissioning involves replacing all the short circuit isolators.
The supply polarity to isolators is important and must be checked and corrected if necessary
before fitting the 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.
6.5 A1535 (Programmable Relay Expansion Boards) and A1536
(Programmable Alarm Expansion Boards)