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Instructions to the installer.
Reasons that lead to isolation
1.
Short Circuit condition
2.
Wrong Polarity on Input Output terminals
3.
More than 3 devices connected on the isolator output
4.
Increased losses on the loop wiring
5. Protocol integrity faults
Installation - Comments
1.
Regardless the isolator’s condition on the
-L
wiring there is electrical continuity.
2.
By hardware, the attached detector is powered automatically from the output side terminal of the
isolator, simply rotating itself on the isolator. It is advised the electrical connection of each isolator
on the loop, to comply the input / output markings so that in short circuit condition “only one”
detector to be out of order.
3. When connecting the isolators in the loop, the first and the last isolator should be connected to the input
terminal (+ L-L INPUT). There will be two intermediate isolators linking output to output.
The non
compliance of input/output process during electrical installation, is found in case of short circuit
condition with all detectors operational. In this case, detection of the location of the short circuit
cannot be achieved from location of the “lost detector’s address” but on step by step short circuit
wiring check process from the qualified technician- installer.
4. We remind that power loss of a loop leads to isolated condition of all isolators.
5.
The loop is Time and Isolator controlled which means it takes at least (0,5sec * number of the
installed units) time to change from open loop condition to close loop condition where all devices
are available to the main panel for scan and registration.
6. Avoid to connect more than 4 additional units on the output of the isolator (4 detectors or 2 sirens
or 3 call points) between two isolators. The device may inhibit the output from power considering
increased cable losses. Maximum resistance between isolators in each loop, should not exceed
the 1,5Ohm.
7.
Overcome of problem case (6) due to output overload, is achieved by running Reset command
on main panel. With this command we provide the ability of temporary (until next short circuit
detection) loop powering, enabling the installer to modify the loop structure easily.
8.
Like all loop powered devices, with Reset command the isolator is forced to reset condition.
9.
It is possible during the restore of a short circuit condition, the main panel to read more than one
addressable devices with the same address. Since the restore condition is a transient condition of
loop extension and repair process, it is advised to execute a Reset command with automatic
identification of all address devices before any thoroughly inspection check of each address point.
10.
In the output of the isolator (on the wiring) we have the following AC measurements
:
a
.
Below the value of 2V
voltage difference in case of short circuit (assumed open loop
)
c
.
Below the input voltage difference in case of load charging process
(
assumed open loop
)
c
.
Equal to input voltage difference for set condition
(
assumed closed loop
)
11.
There is no extra action from the installer to connect / disconnect a detector on the isolator,
except the simple rotation action like the normal basis. The operation of the isolator is the same
regardless the presence or not of the detector.
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