Paradox 738ULT Reference & Installation Manual Download Page 8

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Reference & Installation Manual

2.5

Bell/Siren Output

The

BELL

+ and

BELL

- terminals, power bells and/or other warning devices require a steady voltage output during an alarm. The

bell output supplies 12Vdc upon alarm and can support one 20-watt siren or one 30-watt siren. The bell output is microprocessor-
controlled and will automatically shut down if the current exceeds 3A. If the load on the bell terminals returns to normal, the
processor will resume power to the bell terminals upon generation of another alarm. When connecting sirens (speakers with built-
in siren drivers), please verify correct polarity. Connect the positive lead to the

BELL

+ terminal and the negative lead to the

BELL

terminal of the control panel as shown in Figure 5.

Should the power supply and/or battery voltage level drop below a safe operational level during an alarm, the bell/siren output will
be disconnected to allow the system to properly dispatch an alarm condition to the monitoring station. In this event, the system is
designed to prevent the bell/siren output from activating until the backup battery capacity reaches 50%. This leaves more energy
for the control panel’s power supply to rapidly charge the backup battery. The bell/siren output circuitry will then only reactivate
after another alarm condition has occurred. Once this condition has been met, the bell/siren output will function normally.

2.5.1

Alarm Relay Outputs (738 Ultra; Optional)

The alarm relay output is a single pole 5A relay with double throw dry contacts that follows the bell/siren alarm output.

If the Bell/Siren output is not being used, connect a 1k

resistor across the

BELL

+ and

BELL

- terminals.

Figure 5: Bell/Siren Output Connection

2.6

Programmable Outputs (PGMs)

The 728 Ultra and 738 Ultra control panels include one (728 Ultra) or two (738 Ultra) fully programmable outputs (PGM). When a
specific event or condition occurs in the system, a PGM can be used to reset smoke detectors, activate strobe lights, open or
close garage doors and much more. The PGMs provide a maximum 50mA output. If the current draw on a PGM output exceeds
50mA, we recommend the use of a relay as show in Figure 6. The PGMs can be programmed to turn on and off for more than a
thousand different events. For example, a PGM can open and close an automatic garage door by pressing keys

[1]

and

[2]

simultaneously on the keypad. For details on how to program the PGMs, refer to

PGMs (Programmable Outputs)

on page 35.

Figure 6: Connecting the PGM output

2.7

Keypad and Keyswitch Connections

Connect the four keypad connections labeled

RED

BLACK

GREEN

and

YELLOW

to the corresponding colour terminals on the

control panel as indicated in Figure 7. Please note that on some keypads you may have to remove the back panel to make the
connections. Connect the keyswitch to the

GRN

and

BLK

terminals of the control panel as shown in Figure 7. To enable this

function, please refer to

Arming Using a Keyswitch

on page 33 and

Keyswitch or Pushbutton Arming/Disarming

on page 42 for

more information on keyswitches.

Figure 7: Keypad and Keyswitch Connections

Low voltage door
activation input