131 Eisenhower Lane North
Lombard, IL 60148
630.268.0010 / 1.800.251.2408
P/N 53-00920-100 Rev. B 101505
www.intellitec.com
Intellitec
INSTALLATION AND SERVICE MANUAL
Monoplex Trio
PRODUCT DESCRIPTION
Switch Panel Backlit
The Monoplex Trio is used to switch 12 volt DC loads in a specialty vehicle application. It includes seven channels of
switching, all of the output channels are solid state devices, (self-Protecting FETs). The module is capable of
providing dimming on four channels and then ON/OFF logic control for the remaining three output channels. The
various channels are operated from a single pair of wires by momentarily applying a particular value of resistance
across these two wires. The resistors can be installed on a switch panel or by using the programming switch
adapters available for the system.
At the press of a switch, the particular channel associated with that resistance will come on; the next press will turn it
off. With this scheme, as many switches as desired can be used on the system to switch any channel.
When one of the channels is switched with the solid state output, by pressing and holding the button, the channel will
dim the lights connected to that channel. When the button is released, the brightness level will be held. Another
momentary press of the button will turn the light off. When the button is pressed again, it will come on to the level it
was at when it was turned off. The desired illumination level is stored internal to the Monplex Trio , even if power is
removed from the module.
A Dip Switch, (Sw1) is used to set the dimming capabilities of the four dimming channels. These can be set to be
dimming for lighting or non-dimming for loads, such as motors.
There is an assortment of switch panels that may be connected to the Monoplex Trio, some switch panels may be
backlit. Power for backlighting and illuminating the activated switch is supplied from the module. Indication that the
switch is activated is indicaetd on the switch panel and indication that the output channel is powered up is indicated
by the LED being illuminated on the module.
In the event that a fault condition exists on the module,(over current, over temperature, loss of communication,
excessive in-rush current), the affected switch panel position LED will flash as prescribed below:
Over current - Slow Flash rate,1 Hz
Over Temperature -Shutter LEDs on switch panel
Switch Input Fault - Yellow LED fails to illuminate when a switch is pressed
The fault will be communicated to the switch panel to alert the user of the fault condition. If there is a communication
link fault between a switch panel and the Monoplex Trio module, the Yellow LED on the module will not illuminate in
response to the switch position on the switch panel being pressed. The Monoplex Trio will automatically shutdown if
the inrush surge current is greater than 70 Amps on any channel.
Sometimes, an inductive loads may provide an opportunity to have large current spikes fed back into the module.
The module will protect itself by shutting down and will require the output channel to be engaged again.
HOW IT WORKS
The backlit for the user switch panel will illuminate when either of the following two conditions are
satisified.
2
