What will happen if I attach a torque detector backwards, on the load side instead of the drive side?

(1) Attaching a torque detector

 

The detector includes a "drive side" label. Attach the drive device to the "drive side" so that the load device is located on the opposite side. The operating manual presumes this configuration in its descriptions and defines the polarity of + and - torque and CW/CCW (clockwise rotation/counterclockwise rotation) accordingly. Install correctly; otherwise, discrepancies with the operating manual will result.

 

 

(2) CW/CCW

 

Clockwise rotation (CW) and counterclockwise rotation (CCW), are defined looking at the "load side" from the "drive side." The CW/CCW changeover switch on the detector and the CW/CCW setting on the TS display must be set to match the direction of axial rotation.

 

 

(3) Function of the included detector motor

 

As noted in the figure describing the operating principle, the detector includes a motor. Due to its generator configuration, a SIN wave signal is not output unless the shaft turns at several hundred r/min or faster. Consequently, the included motor rotates internal gears in a direction opposite that of the shaft, producing a state of relative rotation, even if the shaft does not rotate, and allowing capture of a SIN wave signal. As a result, CW or CCW rotation of the shaft is in each case reversed when the CW/CCW change switch of the detector is selected.

 

 

(4) Measurement with the shaft rotating in the same direction as the included motor

 

The motor included differs depending on the detector model but generally rotates at 500 to 600 r/min. When rotating in the same direction as the shaft, measurements can be made with the shaft rotating at approximately 200 r/min or lower; when approaching 500 to 600 r/min, relative rotation approaches zero, a SIN signal can no longer be captured, and measurements cannot be made.

 

 

(5) Measurement with rotation of the included motor stopped

 

At 200 r/min rotation of the shaft or more, a SIN signal can be captured while the included motor remains at rest, and measurement is possible with either CW or CCW rotation.

 

 

(6) Torque polarity

 

Torque display and voltage output on the TS series torque meter include a + or - polarity. As relates to the rotational direction described in Item (2), using as a basic concept the example of an automobile engine, and assuming CW rotation during forward movement, the actual engine load during hill climbing has a + torque polarity, and engine braking during descent of a steep hill has a - torque polarity. Similarly, assuming CCW rotation during reverse movement, hill climbing in reverse has a + torque polarity, and engine braking during descent of a hill in reverse has a - torque polarity.

 

Polarity is defined as follows.

 

Considered as the direction of force application (direction of torsion) to a torsion bar when the load side is locked and the drive side rotates,

 

In the CW setting

+ torque polarity when shaft is operated by clockwise rotational force

- torque polarity when shaft is operated by counterclockwise rotational force

In the CCW setting, polarity is opposite that in the CW setting

- torque polarity when shaft is operated by clockwise rotational force

+ torque polarity when shaft is operated by counterclockwise rotational force

 

(7) What happens during driving from the load side?

 

Measurements can be made. Because the CW/CCW switch on the detector changes the rotational direction of the included motor, the CW/CCW setting on the TS series torque meter serves to determine the direction in which + torque polarity applies torsional force to the torsion bar. Apply the definitions of polarity in Item (6) on this basis.

 

 

(8) What happens if the drive side of the torque detector is attached backwards, to the load side?

 

Measurements can be made. Be aware of the CW/CCW direction of the detector when applying settings. Polarity should also conform to Item (6). Install correctly; otherwise, discrepancies with the operating manual will result.

 

 

(9) Zero adjustment

 

The zero point of the TS series torque meter differs for CW/CCW respectively; adjust the zero point for each. Zero points are stored by battery backup.

Revised:2000/06/09


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