F3200/NDU AS4428.1 Installation Manual
Document No: LT0255
Applications
Page 6-32
5 July 2016
Issue 1.22
4 TERMINAL ISOLATED REPEATER WITH ZONE ADAPTOR UNIT ZAU401 (REV 2)
(CONTINUED)
Notes
1.
Circuit lengths quoted are total from the FIP 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 maximum value is.
5.
The (M) after a detector quantity indicates the maximum quantity allowed per circuit.
6.
The maximum detector quantity permitted is calculated using a maximum circuit
current of 1.8mA for C29BEx and 0.3mA for R24BEx.
6.4.3.4
4 TERMINAL ISOLATED REPEATER ALONE
When all the detectors on the IS circuit will generate a short circuit alarm condition it is
possible to use the lower-cost, 4-terminal isolating repeater without a ZAU401. This is
shown in Fig 6.4.3.4.
The following 4-terminal isolating repeaters can be used. Note that dual channel repeaters
have two separate repeaters and can connect two circuits to the panel.
Pepperl & Fuchs
KHD0-ICS/Ex 1.51 (single channel)
Pepperl & Fuchs
KHD0-ICS/Ex 2.51 (dual channel)
Pepperl & Fuchs
KFD0-CS-Ex 1.51P (single channel)
Pepperl & Fuchs
KFD0-CS-Ex 2.51P (dual channel)
Measurement Technology Ltd
MTL5061 (dual channel)
FIG 6.4.3.4
SHORT-CIRCUITING DETECTORS WITH 4 TERMINAL REPEATER
SEE
TEXT
