Current Ratings
In order for the system to operate properly, the power output of the
PC4204CXCF module cannot be exceeded. For the maximum available
AUX current, refer to the Battery Selection Charts based on 24h/60h
standby power time. The maximum available AUX supply current is
dependent on the size of the transformer used as well as the selected
battery charge current. Use jumper J2 to control the supply current
(see below).
Maximum
Maximum
Maximum
Maximum
Maximum AUX Supply Curr
AUX Supply Curr
AUX Supply Curr
AUX Supply Curr
AUX Supply Current
ent
ent
ent
ent
B
B
B
B
B
A
A
A
A
ATTER
TTER
TTER
TTER
TTERY
Y
Y
Y
Y
C
C
C
C
C
HARGE
HARGE
HARGE
HARGE
HARGE
40V
40V
40V
40V
40VA
A
A
A
A
80V
80V
80V
80V
80VA
A
A
A
A
C
C
C
C
C
URRENT
URRENT
URRENT
URRENT
URRENT
T
T
T
T
T
RANSFORMER
RANSFORMER
RANSFORMER
RANSFORMER
RANSFORMER
T
T
T
T
T
RANSFORMER
RANSFORMER
RANSFORMER
RANSFORMER
RANSFORMER
HI-CHRG (400mA)
600mA
900mA
ON
HI-CHRG (1.2A)
150mA
900mA
OFF
NOTE:
All devices connected to the AUX output must be UL Listed for fire
protective signaling service as well as burglary protective signaling service.
NOTE:
When using the PC4204CXCF to repower additional Combus modules,
current calculations must be made to ensure that the maximum AUX supply
current is not exceeded.
Module Ratings
The current draw of compatible modules is listed below:
Device
Device
Device
Device
Device
Current Draw (mA)
Current Draw (mA)
Current Draw (mA)
Current Draw (mA)
Current Draw (mA)
Keypad (LCD45XX) ............................................................................. 50
PC4108A Zone Expander .................................................................... 30
PC4116 Zone Expander ....................................................................... 30
PC4164 Wireless Receiver ................................................................. 110
PC4701 Fire Module ............................................................................. 35
PC4702BP Dual Bell Output Module ................................................. 75
PC4204CXCF Relay Output Module ................................................. 30
PC4216 Low Current Output Module ............................................... 15
ESCORT4580 Audio Assistant .......................................................... 150
PC4400 Printer Module ....................................................................... 30
PC4820 Access Control Module ......................................................... 35
PC4936 Audio Interface Module ........................................................ 65
PC4401 Serial Interface Module ......................................................... 35
PC4850 Telephone Entry Module ..................................................... 135
Calculating Total Current Requirement
Once you have determined which modules will draw power from the
main panel, use the following chart to calculate the Combus current.
Combus Current Calculation Chart
Item
Current (mA)
x
Quantity
Total (mA)
Keypad
50
x
PC4108A*
30
x
Current required for connected devices =
PC4116*
30
x
Current required for connected devices =
PC4164
110
x
PC4701
35
PC4702BP
75
x
PC4204CXCF
30
x
PC4216*
15
x
Current required for connected devices =
Escort4580
150
PC4400/4401 30/35
x
PC4820
35
x
PC4850
135
x
PC4936*
65
Alt. Comm.
T
T
T
T
Total Combus Curr
otal Combus Curr
otal Combus Curr
otal Combus Curr
otal Combus Current =
ent =
ent =
ent =
ent =
NOTE:
* These modules draw current from the Combus to power devices
external to the module. This current must be added to the total Combus current.
See manufacturer’s specifications for the current draw of each device. Each
LED assembly draws up to 20mA of current.
Combus Operation and Wiring
The Combus is used by the control panel and the modules to
communicate with each other. When the PC4204CXCF is used to
repower the Combus, please refer to the wiring diagram for the exact
wiring procedures.
Note: Please follow the diagram exactly.
Modules can be home-run, connected in a daisy chain or T-tapped
anywhere on the Combus.
The following rules MUST be followed when wiring the Combus:
1.
1.
1.
1.
1. The Combus must be run in minimum 18-gauge wire.
2.
2.
2.
2.
2. No module can be more than 1000' (305m) in cable length from
the PC4204CXCF (see below ‘Combus Extensions’).
3.
3.
3.
3.
3. Shielded wire should only be used in areas that present excessive
RF noise or electromagnetic interference. If shielded wire is used,
the maximum distance a module can be located from the
PC4204CXCF is significantly reduced. Check the capacitance rating
of the wire to calculate the maximum distance (see “Capacitance
Limits” below).
NOTE
: Shielded wire is not recommended.
4.
4.
4.
4.
4. The total capacitance of the Combus wiring must not exceed 80nF
between the control panel and PC4204CXCF module or between
two PC4204CXCF modules (see “Capacitance Limits” below).
Long Distance Combus Extensions
The length of Combus from a PC4204CXCF Combus Regenerator can
be extended beyond 1000’, providing the following conditions are met:
• Combus must be regenerated and repowered at both ends of the wire
run using PC4204CXCF and modules.
• No other modules are to be connected along the long distance wire run.
• A maximum distance of 4000’ can be achieved between two
PC4204CXCF devices. To extend further, additional PC4204CXCF
devices should be used.
NOTE:
The wiring used to connect this equipment must be insulated with
PVC, TFE, PTFE, FEP, neoprene or polymide.
Line Loss
When current is drawn through a piece of wire, voltage will be lost
due to the wire’s resistance. This voltage loss must be considered for
all installations.
To ensure proper operation, at least 12.5V
DC
must be applied to all
modules on the system (when AC is applied and the battery is fully
charged). If less than 12.5V
DC
is applied, system operation will be
adversely affected.
