OMRON H8PR electronic cam debugging

During actual operation, the encoder rotates synchronously with the spindle, and H8PR drives the sealing solenoid valve and cutter solenoid valve based on real-time angles.

5.2 Multi station turntable positioning

In the turntable assembly machine, it is necessary to output a pulse at each of the four positions of 0 °, 90 °, 180 °, and 270 ° to control the indexing mechanism to stop or move. Four ON/OFF segments can be set through one output point (e.g. ON 0 ° OFF 1 °, ON 90 ° OFF 91 °, ON 180 ° OFF 181 °, ON 270 ° OFF 271 °). However, it should be noted that the shortest ON interval output must meet the minimum response time of the load. The minimum angle of H8PR is set to 1 °. If the speed is high, the duration corresponding to 1 ° may be extremely short (e.g. 1 °=0.278ms at 600rpm), far less than the output response time. Therefore, when applying at high speeds, it is necessary to calculate whether the minimum ON angle is greater than the angle corresponding to the response time.

Fault diagnosis and common problems

6.1 No output or abnormal output

Possible causes and solutions for the phenomenon

All outputs are inactive, the power supply is not connected, or the INHIBIT input is valid. Check the power supply voltage and confirm that the INHIBIT terminal is open circuit

Output action but the angle is inaccurate. The origin is not calibrated or the encoder coupling is loose. Perform origin compensation or tighten the coupling

Partial output point failure, damaged output transistor or load short circuit. Check if the load current exceeds 100mA and replace the damaged output point

During operation, if the output of the chaotic encoder signal is affected by interference, check for shielding and grounding. Use a DC12V power supply and add filtering capacitors

6.2 Encoder related alarms

H8PR has built-in encoder input error detection function. If "ERR" appears, possible reasons may be:

Encoder power supply voltage abnormality (below 4.5V or above 13.2V)

Poor contact or disconnection of encoder output line

Internal circuit failure of encoder

Countermeasure: Measure the power supply voltage of the encoder, check the cable connection, and replace the encoder if necessary.

6.3 Program loss

If all set values disappear after power on, it is mostly due to the depletion of the built-in battery. Steps for battery replacement:

Open the rear battery compartment of the H8PR front panel

Remove the old battery (CR2032 or equivalent) and be careful not to short circuit it

Install a new battery and reset the program. If there is no backup, reprogramming is required.

Maintenance and upkeep

Regular inspection: Check the coupling of the encoder shaft for looseness and the output terminal screws for tightness every month.

Cleaning: Although the encoder is IP52F dustproof and oil proof, it should be regularly wiped to prevent oil stains from entering the socket in harsh environments for a long time.

Battery life management: It is recommended to replace the battery every 5 years, even if there is still electricity. Keep H8PR powered (or quickly replace) during replacement to avoid RAM data loss.

Spare parts suggestion: For critical production lines, it is recommended to stock one H8PR host and one E6F encoder for emergency replacement.