OHAUS Frontier FC5515R, Руководство по обслуживанию

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CHAPTER 1 GETTING STARTED
FC5515R Centrifuge Service Manual 1-15 Ohaus Corporation www.ohaus.com
1.8.2.3 Frequency Converter.
The frequency converter generates the drive signals for the asynchronous motor.
The converter leads the current generated by the motor during deceleration to a heating resistor
to reduce the current.
The frequency converter is connected with the power board by a serial interface.
There is a green LED on the converter which light up when the frequency converter is working
correctly.
A defect of the converter will be indicated in the TIME display as an error no. (See chapter 3.5).
1.8.2.4 Rotor Recognition.
The centrifuge will recognize the inputted rotor through the set up in the control panel. As soon
as the lid get closed the rotor number will be indicated in the speed display.
If the pre-selected rpm is higher than the permitted rpm of the rotor, the rpm pre-selection
indication will flash when starting the centrifuge.
But the regulation will accelerate the rotor only to its permitted rpm
1.8.2.5 Speed Signal.
The actual speed is extracted by a hall-effect-sensor placed on the lower side of the motor.
There is a “preset/actual "comparison in the control board. Thereupon a new “actual-signal” is
given by the control board to the converter.
Figure 3: Hall-Effect-Sensor
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