Torque Meter Frequently Asked Questions

(1) Installation of the torque detector
The installation of the detector involves affixing the nameplate "drive side" to the detector. Please install the drive device on the "drive side" and the load device on the opposite side. The instruction manual defines and explains the polarity of + and - torque, as well as CW/CCW (clockwise/counterclockwise), based on this configuration. Please use the correct installation to avoid discrepancies with the manual.

(2) CW/CCW
When viewed from the "drive side" to the "load" side, the axis is defined as clockwise (CW) and counterclockwise (CCW). The CW/CCW switch of the detector and the CW/CCW settings of the TS display must be set to match the direction of rotation of the axis.

(3) Role of the Attached Motor of the Detector
As indicated in the diagram explaining the principle, the detector is equipped with an attached motor. Due to the power generation method, the shaft must rotate at several hundred r/min or more to produce a sine wave signal. Therefore, by having the attached motor rotate the internal gear in the opposite direction to the shaft, it creates a state where the shaft appears to be rotating relatively even at zero rotation, allowing the sine wave signal to be extracted. Thus, when selecting the CW/CCW switch of the detector, it is designed to rotate the shaft in CW/CCW and the opposite direction accordingly.

(4) Measurement when the attached motor is rotating in the same direction as the shaft
The attached motor rotates at approximately 500 to 600 r/min, depending on the model. When it rotates in the same direction as the shaft, measurement is possible when the shaft is approximately 200 r/min or lower, but as it approaches 500 to 600 r/min, the relative rotation becomes zero, and the SIN signal cannot be extracted, making measurement impossible.

(5) Measurement when the attached motor is stopped
If the shaft rotation is 200 r/min or more, the SIN signal can be obtained while the attached motor is stopped, allowing measurement in either CW or CCW.

(6) Torque Polarity
The torque display and voltage output of the TS calculation display have + and - polarities. This relates to the rotation direction in (2), but the basic idea can be illustrated using a car engine as an example: when the tires are rotating clockwise (CW) during forward motion, the engine's actual load when climbing a slope is considered + polarity, while the engine brake state when descending a steep slope is considered - polarity. Similarly, when the tires are rotating counterclockwise (CCW) during reverse motion, climbing a slope in reverse is + polarity, and descending a slope in reverse with engine braking is - polarity.
The polarity is defined as follows:
When the load side is locked and the drive side is rotated, considering the way the torsion bar is loaded (twisted),

During CW settings

When a force is applied to rotate the axis clockwise + pole
When a force is applied to rotate the axis counterclockwise - pole

When setting to CCW, the polarity is reversed compared to CW.

When a force is applied to rotate the axis clockwise − pole
When a force is applied to rotate the axis counterclockwise + pole

(7) What happens when driven from the load side
Measurement is possible. The detector CW/CCW switch is included to switch the rotation direction of the attached motor, so the CW/CCW setting of the TS calculation display serves to determine which direction the positive polarity will be in relation to the twisting force direction of the torsion bar. Please apply this in accordance with the definition of polarity in item (6).

(8) If the drive side of the torque detector is installed in reverse as the load side,
it can be measured. Please pay attention to set the detector's CW/CCW direction. Also, the polarity follows (6). Since discrepancies may occur with the explanation in the manual, please ensure proper installation.

(9) ZERO Adjustment
The zero point changes for both CW and CCW of the TS calculation display, so please perform ZERO adjustment for each. It will be stored with battery backup.