Crank Angle Sensor Frequently Asked Questions

Adjust the offset volume to correctly output pulse signals of 1P/R, 720P/R, and 360P/R. It is recommended to check the waveform with an oscilloscope while making adjustments.

MONITOR output

back panel

⑭ 1P/R
⑮ ANGLE

This is a connector that outputs input signals from the CP-5100 and CP-5200 detectors. By observing this waveform, you can confirm whether the detector is functioning normally. The operational waveform for the CA-500A is shown in Figure 1. Depending on the situation, such as fiber cable relays, the maximum voltage will be ±15V. If the amplitude is smaller than that in Figure 1, inspection of the CP detector side is required.

Figure 1

(2) Pulse output 1P/R, 1/1, 1/2 output connector

front panel

①1P/R pulse output LED
②1P/R pulse output connector
④ANGLE pulse output LED
⑤ANGLE pulse output

⑥1/2ANGLE pulse output LED
⑦1/2ANGLE pulse output connector

Output a signal of one pulse per rotation from ② to make the LED at ① blink. Output an ANGLE signal (for example, 720P/R) from ⑤ to make the LED at ④ blink. Halve the signal from ⑤ (for example, 360P/R) and output it from ⑦ to make the LED at ⑥ blink. (If the signal frequency is high, it may appear almost continuously lit.)

Adjustment of OFFSET

1P/R pulse output

⑫1P/ROFFSET volume
⑬ANGLE OFFSET volume

The input signal of 1P/R is superimposed with the DC component as shown in Figure 2 by turning the ⑫1P/ROFFSET volume. The threshold for pulse output is 0V. Pulses are output at the timing shown in Figure 2. Operate the engine at an appropriate RPM, first turning the OFFSET volume fully counterclockwise (which applies a positive voltage offset), and then slowly returning it counterclockwise until the LED lights up. Further turning will cause the LED to turn off. Please adjust to ensure a stable waveform is output.

Figure 2

■ ANGLE Pulse Output

As with the 1P/R setting, adjust the ⑬ANGLEOFFSET volume to stabilize the pulse width output as shown in Figure 3. For example, when it is confirmed that the output is appropriate at 720P/R per rotation, the ④LED will be turned on. The OFFSET volume is turned fully clockwise to apply a positive voltage offset.

Figure 3

(4) Timing of 1P/R and ANGLE pulse output

As mentioned in item (3), the adjustment of the OFFSET volume changes the pulse width. Monitor the 1P/R pulse and the ANGLE pulse simultaneously to check their timings. Depending on the requirements of the connected devices, such as combustion analyzers, there is a possibility of malfunction if the rising (or falling) edges of the 1P/R pulse and the ANGLE pulse are synchronized. Therefore, adjust the 1P/R OFFSET volume slightly, as shown in Figure 4, to avoid this issue. This can also be a cause for the LED not blinking.

Figure 4