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F3200 Installation & Programming Manual Document No: LT0122
Applications
Page 9-30 5 July 2001 Issue 2.7
9.4.3.4 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 Figure 9.4.3.4.
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 9.4.3.4
SHORT-CIRCUITING DETECTORS WITH 4 TERMINAL REPEATER
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 MCP and detector operation on the same circuit.
Detector quantity and circuit length limits are shown in Table 9.4.5.
SEE
TEXT