14
4.3
The length and cross section of the wires used to connect executive devices to the unit must
provide the current load for executive devices.
4.4
Connect the fire-fighting system as shown in Figure 4. The length of wires used to connect
the fire-fighting system and the resistance of the additional resistor must have the values which provide
the required current of activation of the electric activator.
4.5
The required value of the additional resistance R
add
is estimated using the formula below:
)
(
2
min
fight
1
2
R
R
R
I
U
R
add
+
+
−
−
=
,
where
:
U
min
stands for the minimum voltage of the power supply (10 V for a RIP-12 or 20 V for a
RIP-24);
I stands for the required current of activation, [A];
R
1
stands for the resistance of wires between the power supply and the unit, [Ohm] (see
Clause 4.2);
R
2
stands for the resistance of wires between the S2000-KPB and the fixed fire-fighting system,
[Ohm] (see Clause 4.2);
R
fight
stands for the effective resistance of the exploder (bridgewire), [Ohm].
4.6
The standard resistance for R
add
is to be selected from the E24 series as the nearest smaller
value relative to the estimated value above.
4.7
The R
add
resistor must have enough power, especially if the activation time exceeds one
second.
4.8
For example, if the unit is powered by a 24 V power supply, the resistance of the connected
wires doesn’t exceed 0.3 Ohm, the resistance of the exploder is 6 Ohm, and the estimated current of the
activation of the exploder is 0.1 A, then the resistance value of the additional resistance should be 160
Ohm.
4.9
If the circuit connected to an output is monitored neither for open circuit failure nor for short
circuit failure (the first type of monitored circuits), no load connection module is necessary to install.
4.10
The conditions of the outputs #1 to #6 and the circuits connected to them can be monitored
using the LEDs “1” to “6”.
4.11
The conditions of the alarm loops can be monitored using “MASS” and “PRES” indication.
5
MAINTENANCE
5.1
General
The unit shall be maintained by electricians with electrical safety qualification level three and
higher.
Connecting external circuits to the terminals of the unit use a screwdriver with a tip of PHILLIPS
PH1 type; a screw torque must not exceed 0.25 Nm.
5.2
Annual Maintenance
5.2.1
Inspect the unit visually for mechanical damage.
5.2.2
Remove dust, debris, moisture (condensation) from the unit’s surface.
5.2.3
Remove the unit’s cover.
5.2.4
Switch off the battery backed power supplies connected to the unit or detach power circuits
from the contacts “+U
main
” and “+U
back
”.
5.2.5
Remove dust, debris, and corrosion from the surface of terminals and fuses.
5.2.6
Ensure the unit case and wire terminals are fastened properly.
5.2.7
Switch on the battery backed power supplies connected to the unit or connect the power
circuits to the terminals “+U
main
” and “+U
back
”.
