Document No: LT0255
F3200/NDU AS4428.1 Installation Manual
Applications
Issue 1.22
5 July 2016
Page 6-33
4 TERMINAL ISOLATED REPEATER ALONE (CONTINUED)
Programming & Limitations
The required EOL resistance is lower than the standard 2k7. Two methods for obtaining the
correct EOL value are:
1.
Place a 22K 5% resistor in parallel with the supplied 2k7 EOL. This achieves the
required value.
2.
Or just use a 2k2 5% resistor as the EOL.
The circuit should be programmed as Mode 1, B3 as Normal, and B1 should be programmed
as Fault.
There can be no differentiation between a short circuit fault, a short-circuiting MCP, and
detector operation on the same circuit.
Detector quantity and circuit length limits are shown in Table 6.4.5.
DETECTOR
GAS GROUP 11A OR 11B
GAS GROUP 11C
QTY
CCT LENGTH
QTY
CCT LENGTH
TYPE
PART
BASE
1.0mm²
0.75mm²
1.00mm²
0.75mm²
HEAT
HEAT
HEAT
FW105
T54B
T56B
-
-
Z500N
-
40(M)
40(M)
NOTE 2 & 3
(68
Ω
TOT)
2km(R)
(68
Ω
TOT)
2km(R)
(100
Ω
)
NOTE 2 & 3
(68
Ω
TOT)
1.5km(R)
(68
Ω
)
1.5km(R)
(68
Ω
)
-
40(M)
40(M)
1.3km TOT
(130nF)
1.3km(C)
(130nF)
1.3km(C)
(130nF)
1.3km TOT
(130nF)
1.3km(C)
(130nF)
1.3km(C)
(130nF)
TABLE 6.4.5
MAXIMUM DETECTOR QUANTITY & CABLE LENGTH FOR 4 TERMINAL
REPEATER ALONE
Notes
1.
Circuit lengths quoted are from the isolator to the EOL. The length quoted is the
maximum for the corresponding quantity of detectors.
2.
Cable resistance shown is for the circuit, i.e. both cables in the pair. The value of
34
Ω
per km (return) is used for 1 mm².
3.
The maximum resistances shown for the fire wire circuits must include both cable
and fire wire (see table 6.4.2 and associated note 2).
4.
The letter in ( ) after the cable length, and the value in ( ) under the cable length
specify which parameter out of capacitance (C), inductance (L) and resistance (R)
provides the limitation, and what the limiting value is.
5.
The (M) after a detector quantity indicates the maximum quantity allowed per circuit.
