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Introduction to Modules
The Combus terminals on the KT-300 controller are used to connect
expansion modules to add more inputs, outputs, relays and LCD time and
date display. The four Combus terminals of the main panel must be
connected to the four Combus terminals or wires of all modules.
There are 4 expansion modules that can be connected to KT-300's
Combus (more specifications on each of these modules can be found at the
end of this document).
1)
KT-PC4108 - (8 - Zone Input Expansion Module)
2)
KT-PC4204 - (4 Relay/Power Supply Expansion Module)
3)
KT-PC4216 - (16 - Zone Output Expansion Module)
4)
KT-LCD4501 - (Kantech LCD Keypad Module)
Combus Specifications
The Combus provides 500mA at 12 volt (13.85VDC). The recommended
cable is #22 AWG (Kantech # CBL-ZN). Each loop (module to KT-300)
cannot exceed 300 m (1000') and the total maximum cable length of all
connected loops cannot exceed 1200 m (4000').
For example:
•
Only four wireruns at 1000' from the KT-300
•
Only eight wireruns at 500' from the KT-300
•
Only ten (10) wireruns at 400' from the KT-300
Shielded wire should only be used in areas that present excessive RF noise
or electromagnetic interference. Modules can be straight run, connected
in a daisy chain or T-tapped anywhere on the Combus.
During installation of the modules, it is necessary to inform the system
that new modules have been installed on the Combus. To assign the
modules to your system (software), see your software reference manual
under "assigning modules" in the controller definition menu for detailed
information.
Combus Repower (If required)
Depending on how many modules are connected to the Combus and how
far they are from the KT-300 controller, you may need to "repower" the
controller's Combus.
The Combus needs to be "repowered" if the voltage between the black and
red wires of the last module of each loop drops below 12.5 volt (the
modules will still operate but there will be no communication between the
modules and the controller and an event "Combus module defect" will be
generated from the controller). This voltage drops if modules are drawing
too much current (500mA maximum for the Combus of each KT-300).
With a multimeter, you should verify this voltage and determine if you need
to install a KT-PC4204 in "repower" mode. Using this configuration, you
will be provided with an additional 1 amp of current on the controller's
DN1315-0006 © 2000 Kantech Systems Inc.
(If required)
(If required)
(If required)
(If required)
Combus. The KT-PC4204 is generally installed at the beginning of the
loop.
When using the KT-PC4204 in "repower" mode, the first relay of the
module will be reserved for the "repower function". You will have to assign
an "all valid" schedule to the first relay so it is "permanently activated"
(see your software reference manual in the "controller definition" menu
under "assign modules" for the exact procedure).
If you are using a KT-PC4204 in "repower" mode and other KT-PC4204
modules that are assigned as relays 1-4 or KT-PC4216 modules that are
assigned as relays 1-16 are also connected to the same loop, do not use relay
1 of those modules or relay 1 of the KT-300 door controller. Please also
note that all KT-PC4204 modules that are used for Combus repower
should be assigned as relays 1-4.
Note: The jumper 1 "J1" on the KT-PC4204 must be moved to the Combus
relay position.
Note: Do not use any power supply other than the KT-PC4204 to repower
the Combus. In the event of a power surge or transient, a module may lock
up and cease to communicate with the controller. If the KT-300 loses
communication with the module, it will initiate a module reset and will
power down the Combus for five seconds in an attempt to reset the problem
module. After five seconds, the controller will reapply power to the Combus
and the problem module should begin to operate as intended.
Cabinet for Housing Modules
Kantech part #:
KT-4051CAB
Measurements:
16.8" H x 10.4" W x 4.1" D
Color:
Black
Cabinet will hold either:
•
One (1) KT-PC4204 power supply/relay mod-
ule with batteries and one (1) KT-PC4108/KT-
PC4216.
•
Three (3) KT-PC4216/KT-PC4108 modules
STEP BY STEP INSTALLATION
Page: 11
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