REV 0, June 2005 Page 27
Operation Manual SUPREMA
3. Description of the System
MPI Module (Passive Input Unit)
Functions:
• Current/voltage source for passive sensors (constant current)
• Signal processing for passive catalytic or semiconductor sensors
• Sensor specific pre-adjustment of the zero point
• Preliminary setting of the signal amplification
• Setting of the constant current
MFI Module (FIRE INPUT UNIT)*
One MFI module must be plugged into the MAI module for each automatic or manual fire detector
being monitored.The module must be configured for the relevant application.
(see section 5.3.18
„Configuration of the MFI Module“)
Functions:
• Power supply for up to 20 fire detectors.
• The output voltage of the module is limited to approximately 22 V and the output current is
limited to approximately 42 mA.
• Evaluate the status of each fire detector.
• In normal operation, the module output voltage (UA) is approximately 0.4 V.
• In an alarm situation the output is approximately 1.6 V and for fault approximately 0 V.
• In an alarm situation the module is non-latching.
• If a latching function is required, it must be programmed in the SUPREMA settings..
• The fire detectors connected have a latching function included.
Line monitor
At the last fire detector, an „END OF LINE” resistor must be installed. In the case of short-circuit
or failure, the output voltage (UA) of the module switches to approximately 0 V.
Connection of a zener barrier or current separator is optional.
Operation by an external power supply is optional.
Earth current fault monitor of the line.
An earth current fault is reported if the current is >100 mA between the terminals 3 and 4 at one
side and terminal 5 at the other side.
If there is an earth current fault, the output signal is approximately 0 V.
Output for earth current fault
The output terminal S1 has an open-collector transistor. The emitter of the transistor is connected
with S5.
If there is no failure, the pull-up resistor between S_1 and S_2
In the case of failure, the open-collector transistor is conducting.
The maximum current is 250 mA, and the output is protected against current, voltage and
temperature.
* With regard to fire and smoke detection, the SUPREMA has not been evaluated to any Canadian standard by
a third party agency.
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