Terminal Connections - DSC maxsys PC4020KT System Manual

TERMINAL
CONNECTIONS
This "Terminal Connections" section only refers to the
main board of the PC4020 system. Other connections
are shown in the module wiring diagrams.
"AC" Power Terminals
Use a 16.5 VAC transformer with a minimum 40 VA
rating to supply AC power to the PC4020. The
transformer should not be connected to an outlet that is
controlled by a switch. If AC failure occurs, it will be
displayed as a trouble on the keypad (see "Keypad
Commands, [✱][2] Trouble Conditions"). It can also be
transmitted to the monitoring station as a trouble
condition (see "Programming Manual").
Auxiliary Power Terminals "AUX" and
"GND"
The auxiliary power supply can be used to power motion
detectors and other 12 V
(positive) and "GND" (negative) terminals provide 500
mA when the PC4020 is used with one keypad. For each
additional keypad the auxiliary supply rating must be
reduced by 25 mA (maximum current draw is 55 mA).
The auxiliary supply is fused at 1 amp and a Main Aux
Trouble Reporting Code can be transmitted if the fuse
fails. (See "Programming Manual".)
Switched Auxiliary Power Terminals
"SW AUX" and "GND"
The "SW AUX" terminal is positive while the "GND"
terminal is negative. The 500 mA auxiliary supply rating
must be reduced by any current taken from the switched
auxiliary supply which shares the same fuse as the
auxiliary supply. This output is fully programmable, but
is most commonly used with the "Sensor Reset" option,
allowing the user to control the switch from the keypad.
(See "Sensor Reset".)
Bell/Siren Terminals
"BELL +" and "BELL -"
These terminals are for powering bells or other devices
requiring a steady output voltage on alarm. The bell
output is fused for 5 amps. When connecting sirens
(speakers with siren driver already built-in), be sure to
observe the correct polarity. Connect the positive lead
to the "BELL +" terminal and the negative lead to the
"BELL -" terminal.
If no siren or bell is used, connect a 1000 ohm resistor
(brown, black, red and gold) between "BELL +" and
"BELL -".
Programmable Output Terminal "PGM "
The operation of the Programmable Output depends
upon which option is selected in the programming table.
See the Programming Manual for a list of options for the
"PGM" output. The "PGM" is a 3A (maximum) switch to
ground. A small relay, a buzzer or other DC operated
device may be connected between the "AUX" (positive)
terminal and the "PGM" (switched negative) terminal to
interface with controlled devices.
devices. The "AUX"
DC
COMBUS Terminals
"RED", "BLK", "YEL" and "GRN"
Connect the red wire of the COMBUS to the "RED" terminal,
the black wire to the "BLK" terminal, the yellow wire to the
"YEL" terminal and the green wire to the "GRN" terminal.
The COMBUS is wired in the same manner on all modules.
The COMBUS is used by the main panel to communicate
with and supply power to the modules.
The COMBUS power supply terminals are fused
electronically.
Note: When connecting modules to the COMBUS the
system must not be powered.
Zone Input Terminals "Z1" to "Z16"
Zone inputs "Z1" to "Z16" can be supervised End of Line
(E.O.L.) resistor circuits, Double EOL circuits or normally
closed loops. If E.O.L. are used, each input must be
terminated with a 5600 ohm E.O.L. resistor (green, blue, red
and gold). An alarm condition will be created if a normally
open contact is used to short across the E.O.L. resistor. A
trouble is created if normally closed contacts, wired in
series with the E.O.L. resistor, are opened. See "Zones
E.O.L." in the Programming Manual. See the wiring diagram
for normally open and normally closed contact connections.
If Double EOL circuits are being used, all zones will use
Double EOL resistors, except Standard Fire zones, Auto
Verify Fire zones, Delay Fire Zones, Links Supervisory
Zones, Links Answer, and Forced Answer zones. These
zones must only be connected using the EOL resistor.
Double EOL resistors allows the zone to be capable of
detecting zone tampers. The tamper resistor (5600 Ohm) is
placed across the alarm activating device, and the single
EOL resistor (5600 Ohm) is placed between the alarm
contact and the tamper contacts. This configuration will
allow the panel to detect Zone faults (zone shorted) , zone
tampers (open zone), open zones (alarm condition of 11200
Ohms), and restored zones (5600 Ohms).
If the zone is disarmed and the tamper (open) or fault
(short) condition is tripped a buzzer will sound from all
partition keypads for the length of Bell Time Out or until an
access code is entered. A zone tamper will be sent to the
monitoring station if programmed. See Reporting Codes for
details.
If the zone is armed and the tamper is activated, it will
transmit and log both the tamper alarm and the zone alarm.
There will be no buzzer sounded if the zone is armed
(unless the zone is programmed as a 24 hour buzzer zone).
See the "Control Panel Wiring Diagram" for detail on the
hookup procedure.
The type of circuit or zone definition (delay, instant, 24 hour,
silent, audible, etc.) is programmed from the keypad using
the installers programming commands.
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