Codan-radio MT-4E Paging Manual de usuario descargar pdf (Pagina 37)

MT-4E PAGING SYSTEMS | USER GUIDE

Chapter 3: MT-4E Paging System Components Page 29

SYSTEM CONTROL AND ALARM RELAY BOARD (OPTIONAL)

The System Control and Alarm Relay Board (SCARB) is a module developed to handle alarm outputs

and to add control functionality to MT-4E systems.

Relays

The SCARB contains ﬁ ve standard relays and three optional relays. The standard relays are for

Transmitter Forward Power Alarm, Transmitter VSWR Alarm, Paging Reference Failure Alarm, 100

Watt Power Ampliﬁ er Alarm and AC Power Supply Failure Alarm.

These relays have normally open (N/O), normally closed (N/C) and common (COMM) outputs. Table

3-2 lists the standard conﬁ guration with available alarm lines and their associated relays and connector

pins.

Table 3-2: SCARB Relay Outputs

Alarm Line Relay Connectors

Transmitter (A and/or B) Forward Power Alarm

(transmitter power output drops

below half of the set level)

RLY1 J4-11 N/O

J4-12 COMM

J4-13 N/C

Transmitter (A and/or B) VSWR Alarm

(transmitter VSWR is higher than 3:1)

RLY2 J4-14 N/O

J4-15 COMM

J4-16 N/C

Paging Reference Failure Alarm

(external reference fails or drifts to far)

RLY3 J5-10 N/O

J5-11 COMM

J5-12 N/C

100 Watt Power Ampliﬁ er Alarm (Input J5-8)

(power amp output power drops to 80%; or

VSWR exceeds 2.5:1; or high temperature)

RLY4 J2-13 N/O

J2-14 COMM

J2-15 N/C

AC Power Supply Failure Alarm (Input J5-9)

(AC power failure)

RLY5 J6-1 N/O

J6-2 COMM

J6-3 N/C

Spare Alarm 1 (Input J6-4)

(open/ground or variable voltage activation)

RLY6 J6-7 N/O

J6-8 COMM

J6-9 N/C

Spare Alarm 2 (Input J6-5)

(open/ground or variable voltage activation)

RLY7 J6-10 N/O

J6-11 COMM

J6-12 N/C

Spare Alarm 3 (Input J6-6)

(open/ground activation or Low System Voltage

Alarm Option - 10 Vdc or 11 Vdc activation)

RLY8 J6-13 N/O

J6-14 COMM

J6-15 N/C

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