Input/output element MHY 926 connects to an addressable loop of FDFAS LITES. Contains 2 programmable inputs and 2 monitored potential relay outputs. Is intended for control and monitoring connected devices with alarm protection.
MHY 926 is an addressable multi-fold input/output element that connects to analogue addressable control panels of FDFAS LITES MHU 115, MHU 116 and MHU 117.
Inputs serve for automatic signalization of predefined special states of any external device which signals this state either by closing/opening an electronic contact or by voltage applied to optoisolated input. Contacts can also be set as monitored. Inputs can be used for monitoring state of external power source dedicated to power supply the outputs of MHY 926.
Outputs serve for control connected external devices. They are potential, monitored for shortcircuit and interruption of lines between the output and connected external device. Monitoring of outputs cannot be disabled. Current for outputs power supply is supplied from connected external power source.
Properties of each input and output are set in configuration program.
The element connects to the detection loop with two-wire lines. Element communicates with the control panel on 4 consecutive addresses. Default address is set via addressing preparation MHY 536 (535) in range 1÷125, while the next three addresses are generated automatically. First two addresses belong to inputs, the next two to outputs.
Electronic circuits are on a PCB which is placed in a plastic box with removable cover. It is possible to place another element MHY 926 into one box.
|The element is designed for environments protected against weather conditions with classification of conditions according to ČSN EN 60721-3-3.|
|K: climatic conditions for the environment||3K5|
|- working temperature range||(from -25 to +70) °C|
|- relative air humidity range max. 95 % at +40 °C||- atmospheric pressure range (from 86 to 106) kPa|
|- without condensation, icing and ice formation|
|Z: special conditions||3Z1 heat radiation negligible|
|B: biological conditions||3B1 without presence of flora and fauna|
|C: chemical active substances||3C1|
|S: mechanical active substances||3S1|
|M: mechanical conditions||3M1|
|Lasting of significant temperature (45 – 70)°C||2 months/year|
|Lasting of significant humidity (85% – 95%/≤ 40°C)||100 hours/year|
|Power supply from detection loop||(18 ÷ 21) Vimp|
|Normal state current (to add to loop current)||max. 200 μA|
|External power supply voltage||22 ÷ 30 V|
|Number of inputs||2|
|Input opto-isolated - voltage|
|input voltage||9 V ÷ 30 V (logical 1), 0 V ÷ 3 V (logical 0)|
|input resistance||10 kΩ|
|Input contact closing/opening|
|closed contact lines resistance||max. 1 kΩ|
|open contact resistance||min. 10 kΩ|
|Input contact monitored|
|lines resistance||max. 100 Ω|
|normal state resistor||10 kΩ|
|alarm resistor||4,7 kΩ|
|external fault resistor||20 kΩ|
|Potential monitored relay outputs|
|Number of outputs||2|
|Output voltage||24 V|
|normal state resistor||10 kΩ/0,5 W|
|max. current at activation||1 A for each output (2A total)|
|Optical signalling||red and yellow LED|
|Protection according to ČSN EN 60529||IP 54|
|Radioscreening degree according to ČSN EN 55022||B class equipment|
|Connectable wires cross-section||(0,2 – 1,5) mm2|
|Dimensions (w × h × d)||(254 × 180 × 63) mm|
|Weight||approx.. 550 g|
The MHY 926 is designed for connection to a safe device according to ČSN EN 60950 and meets the requirements of the ČSN EN 54-18 standard for input / output devices.