EM-M40 Alarm Indication Unit

EM-M40 is an 8-channel alarm logic suitable for alarm control in various automation processes. With EM-M40 alarm panels and systems can be build easily. Each of the 8-channels can be set to activate either with opening or closing contact. Similarly inputs can be controlled with voltage signal also. The indication output display the state of the input in realtime so the unit is s.c. transparent. Indication outputs can be inverted as well, then the output is reversed compared to input. Indication outputs can control signal lamps, leds or relays.

The alarm logic operates in following manner. When the fault signal is detected, the indication light of the particular channel starts to blink and group alarm relay and alarm output gives an alarm. If the fault causing the alarm is removed the alarm stays. The alarm can be removed only with the reset button. When the alarm is acknowledged the group alarm is removed, indication light stays lit until the input situation has been normalized. So alarm blinks and old one stays lit. The alarm input can be delayed for 0.5 to 4 seconds. The alarm delay is same for all channels.

With test input the operation of the unit can be verified, relay output can be excluded from the test. There are 3 alarm outputs: NPN-open-collector, inverted NPN-open-collector and relay outputs. The group-alarm relay is de-energized when alarm occurs so an operating voltage failure causes an alarm as well. All NPN transistor outputs are protected against short circuits and overloading. Protection recovers automatically when the fault is removed. Operating voltage input is protected against voltage surges and inversed voltage.

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