3.2 SPEED CONDITIONING CHAIN
A speed transducer is incorporated into the torque transducer housing in order to measure the rotational
speed of the measuring shaft. This optical transducer is mounted facing a toothed part of the rotor and
produces 60 pulses per revolution.
3.3 BUILT-IN SELF-TEST CIRCUIT (B.I.T.E.)
The torque transducer’s connector has a pin allocated for activating a test signal. When this pin is held low
(logic 0), a test signal equivalent to +5 V DC is activated which superimposes itself to the torque measuring
signal. Therefore, this self-test may be carried out at while the transducer is in use. The signal is supplied
by the control electronics.
The self-test circuit checks the correct functioning of the torque signal conditioning unit. This function,
however, does not in any way obviate the need for a static calibration of the transducer.
32
TM
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OPERATING PRINCIPLES
Summary of Contents for TM 301
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