Premisys ALR 28+14, Reference Manual

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1-8 Alarm Cards
Model No.
Running Head
Alarm Card Descriptions Alarm Cards
Figure 1-5. Jumper Pair Assignments
The outside pin of each jumper pair carries a voltage, while the inside pins are passive. The
outside (left) pins for the jumper pairs in columns JP1 and JP3 carry positive (+) voltages, and
the outside (right) pins for the jumper pairs in columns JP2 and JP4 carry negative (-) voltages.
The default setting for all jumper pairs is the active mode, as shown in Figure 1-6. The sensors
are powered by the ALR 28+14 Card. This setting provides surge protection for the sensors.
Figure 1-6. Jumper Installation for Active Mode
To set the jumper pair to the passive mode, remove both jumpers and then place a single
jumper across the pair, as shown in Figure 1-7. This provides full isolation (to 2500V) for the
sensor.
15
16
17
18
19
22
23
25
26
27
2
8
20
S
I
21
24
JP
3
JP
4
PASV
ACTV
Posit ive (+)
Voltag e
Negat ive (-)
Voltag e
Earlier Version Later Version