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MP92, torque monitor

MP92, torque monitor
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Monitoring of engine torque for 3phase motors Frequency range 10-400 Hz Very suitable in connection with frequency converters Analogue and relay output Adjustable start-up time, reaction time and setpoint Selectable current ranges: 1A, 2,5A, 5A and 10A Produced in accordance with and EMC regulations C-mac® torque monitor type MP92 is used for monitoring of the engine torque on 3-phase motors. The unit is particularly suitable in connection with frequency converters, and it can be used on all converters using the PWM principle. Contrary to motors connected directly to the mains frequency, it is not possible to monitor the mechanical load on a motor which is connected via a frequency converter, by means of a standard power monitoring unit, because both voltage, current, phase angle and frequency must be calculated, and MP92 is developed particularly for this purpose. The torque monitoring principle indicates the correct mechanical load of the motor, independant of the rotation speed, thereby making it suitable in connection with machine monitoring and process control applications. MP92 can be connected directly to motors with a nominal load current up to 10 A, corresponding to approx. 5 kW. In order to get the maximum metering accuracy you can select between 4 different current- and 2 voltage ranges by means of DIP-switches. The unit is supplied with a 0-10 V output, indicating the actual torque in percentage of the metering range, and a 1-pole relay output, which switches if the adjusted setpoint is exceeded. Technical data: Supply voltage: Power consumption: Operating temp.: Humidity: Ranges, current: voltage: frequency: Accuracy: Adjustments: Start-up delay: Reaction delay: Setpoint: Indications: Red LED, Load: Red LED. Level: Red LED, Start: Outputs: Relay, setpoint: Functional diagram: Setpoint Torque Relay LED start LED level Functional description: When the supply voltage is connected, the relay is activated. When the motor starts, and the torque exceeds 5% of the maximum torque, the start-up delay is activated, and in this period the relay will remain activated, no matter if the torque exceeds the adjusted setpoint. At the end of the start-up time the LED "Level" will indicate a possible exceeding of the set-point, and if the reaction delay "tr" is exceeded, the relay releases. Please note, that the relay activates again, when the load is below the set limit, which means you must use the relay output in connection with a latch circuit for the motor, if you want the unit to disconnect the motor in case of an overload. Selection of metering range: The current range must be selected in such a way, that the normal operation current of the motor equals a metering signal of 50-80% (5-8 volt on the output), in this way you will get the best accuracy. You can check the operation range by means of a voltmeter, or you can adjust on the level potentiometer to find the operation level. If you do not want the relay to switch during this test, you can set the reaction delay to max. 0,2 - 20 seconds 0 - 20 seconds 10 - 100% Relay active Set limit exceeded Start-up delay active max. load 5A / 250V

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Selection of metering range: Behind the frontplate you will find a DIPswitch, which is used to select the current and voltage ranges, see table below: Metering voltage max 250 V: DIP 1 ON Metering voltage max 500 V: DIP 1 OFF • Monitoring directly on the motor connections eliminates errors because of disturbances and losses before and in the frequency converter. • Possibility for separate torque monitoring on individual motors, controlled by the same frequency converter. • Simple to install, also in existing installations, without extra mechanical components. Can be installed directly in...

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