Ampac FireFinder PLUS Specifications download pdf (Page 28)

Page 22

FIREFINDER PLUS

(

AUST

)

INSTALLATION

COMMISSIONING OPERATION

4.13.1 Detector loop Isolator Installation

In applications where it is not necessary to use an isolating base for each detector, up to 20 detectors

may be installed between isolating bases.

Note: Refer to Apollo Isolating specifications and guidelines for further details.

If a short circuit or abnormally low impedance occurs, the base isolates the negative supply in the

direction of the fault. When the short circuit is removed the power will automatically be restored.

Note: Isolating base is polarity sensitive.

4.13.2 Loop Isolator calculator

The number of isolating devices on the loop can limit the maximum loop cable length depending on

the type of cable used and the total loop current. Refer to the tables below for reference.

Maximum Cable Length Using 1.5mm². Cable

Number of Isolators 0 5 10 15 20 25 30 35 40 45 50

Loop Current Total (mA)

MAX CABLE LENGTH USING 1.5mm².

50 1000 1000 1000 1000 1000 1000 1000 1000 1000 1000 1000

100 1000 1000 1000 1000 1000 1000 1000 1000 1000 1000 1000

150 1000 1000 1000 1000 1000 1000 1000 1000 1000 1000 1000

200 1000 1000 1000 1000 1000 1000 1000 1000 1000 1000 960

250 1000 1000 1000 1000 973 933 893 853 813 733 733

300 971 931 891 851 811 771 731 691 651 611 571

350 850 810 770 730 690 650 610 570 530 490 450

400 756 716 676 636 596 556 516 476 436 396 356

450 680 640 600 560 520 480 440 400 360 320 280

500 618 578 538 498 458 418 378 338 298 258 218

Maximum Cable Length Using 2.5mm². Cable

Number of Isolators 0 5 10 15 20 25 30 35 40 45 50

Loop Current Total (mA)

MAX CABLE LENGTH USING 2.5mm².

50 1000 1000 1000 1000 1000 1000 1000 1000 1000 1000 1000

100 1000 1000 1000 1000 1000 1000 1000 1000 1000 1000 1000

150 1000 1000 1000 1000 1000 1000 1000 1000 1000 1000 1000

200 1000 1000 1000 1000 1000 1000 1000 1000 1000 1000 1000

250 1000 1000 1000 1000 1000 1000 1000 1000 1000 1000 1000

300 1000 1000 1000 1000 1000 1000 1000 1000 1000 1000 952

350 1000 1000 1000 1000 1000 1000 1000 950 883 817 750

400 1000 1000 1000 1000 993 926 859 793 726 659 593

450 1000 1000 1000 933 867 800 733 667 600 53 467

500 1000 964 897 930 764 697 630 564 497 430 364

4.13.3 Loop Open / Short Circuit.

In the case of an Open Circuit or Short circuit (short circuit isolators used) on the Loop Line the Loop

board provides the ability to drive out from both sides of the loop (In and Out). When these Faults are

repaired / cleared the panel will still report a Loop Fault until a Loop Test is performed on the

appropriate loop.

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Ampac FireFinder PLUS Specifications Page 28

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