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SELCO M3000
The SELCO M3000 is a compact 24 channel Analogue Alarm Annunciator. The M3000 is ideal for surveillance of temperature sensors, pressure sensors and any other kind of sensors providing a signal within the range of 0-20 mA, 0-10 VDC or 0-30 VDC. A linearly pre-scaling is done in order to convert the measured input voltage or current into the entity measured by the sensor (e.g. temperature or pressure). Once this conversion has taken place, all further references are made to the measured entity.
The M3000 provides a cost-effective solution where multiple analog sensors are to be surveyed. The 24 inputs of the M3000 will accept both current and voltage sources, and almost any type of sensors can be connected through use of standard current transmitters. Function The M3000 features a total of 48 programmable alarms. Multiple alarms can be assigned to the same input to provide annunciation at different input levels and selectable delays. An alarm is annunciated when the input passes above or below a critical level, indicated by the set point. Annunciation of an alarm can be displayed on any one of the 24 LEDs located on the front plate. Each LED will indicate new alarms with flashing light and acknowledged (reset) alarms with steady light. The user can acknowledge an alarms by pressing the "C" key. Each alarm can be programmed to contro lone of the 14 open collector (on/off) outputs provided at the rear connectors of the M3000. The 14 open collector outputs are ideal for controlling devices that require an alarm dependent on/off signal. Two additional open collector outputs have been provided, one is intended for siren control and the other will activate to indicate that one or more alarms exist.The front plate includes an illuminated LCD display with 2 lines of 16 characters. The LCD provides the user with a 10 character alarm description, the alarm set point and the actual input measurement. Connection The rear of the M3000 annunciator is illustrated below.The power supply plug-in connector of the M3000 includes 3 terminals, one for+24V DC, one GND reference and one terminal DIM for dimming of the LEDs on the front panel of the unit. For dimming purpose a potentiometer of 100kΩ is connected between the terminal DIM and the terminal GND. The M3000 includes two standard interfaces for serial data communication. The RS232 interface is intended for PC configuration of the unit. The RS485 is intended for long distance bus communication between multiple units. The SELCO H0300 Event Logger can log alarms and events from multiple M1000 and M3000 alarm annunciators, connected to the common 2-wire RS485 bus. The H0300 can survey and log events from up to 63 units. The maximum cable length of the RS485 bus is approximately 1000 metres. The figure below shows the rear of the M3000
24 inputs can be connected via 8 plug-in connectors. Two plug-in connectors located on the right side provide terminals for 14 open collector outputs. The 24 inputs can be connected to sensors with either an analog or a digital output in the form of a current or voltage signal. The 8 plug-in connectors, each with 3 input terminals, provide the 24 inputs to the M3000. A common ground terminal (GND) has been included in each plug-in connector to provide a negative reference for the 3 inputs. |
