Ac" Power Terminals - DSC Maxsys PC4020 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
and "GND" (negative) terminals provide 500 mA when the
PC4020 is used with one keypad. For each additional
module on the Combus, the auxiliary supply rating must
be reduced by the current rating of that module. The
auxiliary supply is PTC at 1 amp and a Main Aux Trouble
Reporting Code can be transmitted if the PTC 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 PTC at 2.5 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 -".
devices. The "AUX" (positive)
DC
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.
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 (max. 500 mA with no load on AUX).
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
(EOL) resistor circuits, Double EOL circuits or normally
closed loops. If EOL are used, each input must be
terminated with a 5600 ohm EOL resistor (green, blue, red
and gold). An alarm condition will be created if a normally
open contact is used to short across the EOL resistor. A
trouble is created if normally closed contacts, wired in
series with the EOL resistor, are opened. See "Zones
EOL" 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).
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