Yaskawa Error Code H66 =link= Jun 2026
The motor is allowed to rather than executing a ramped deceleration.
On Yaskawa VFDs (such as the GA700, GA500, or A1000 series), is classified as a minor fault or an alarm related to Option Communication Error .
Given the "H66" label, also inspect settings in the H6 parameter group (pulse train input/output), especially:
| Step | Action | Expected Result | |------|--------|------------------| | 1 | the drive. Reset fault via digital operator or terminal S1. | Resolves transient communication glitches. | | 2 | Reseat the digital operator. Remove it completely, inspect pins for damage or debris, then firmly snap it back onto the drive. | Clean, tight connection restores communication. | | 3 | Check grounding and wiring. Ensure drive is properly grounded (not daisy-chained). Separate control wiring from main power wiring (minimum 4 inches apart). | Reduces electrical noise interference. | | 4 | Test with a known-good operator. Replace the keypad with a spare (same series, e.g., JVOP-180). | If error clears, original operator is faulty. | | 5 | If remote mounted: Bypass the extension cable by mounting the operator directly to the drive. | Error clears → replace extension cable. | | 6 | Inspect control board. Check for visible damage (bulging capacitors, burn marks, moisture). | No visible damage → possible internal failure. | yaskawa error code h66
To help me tailor any specific technical details, please let me know:
: The digital operator itself or the drive's communication port is faulty. 2. Troubleshooting Steps
If the H66 error occurs intermittently or primarily when the motor ramps up to high speeds, EMI is likely the cause. The motor is allowed to rather than executing
If the error remains, the digital operator itself may be faulty and require replacement.
This data tells you if H66 occurs at high speed, under heavy load, or during deceleration.
On Yaskawa drives (such as the GA700, GA500, or A1000 series), indicates a Gateway Communication Error or an Option Card Communication Time-out . Reset fault via digital operator or terminal S1
: A standard Baseblock, usually triggered by a software command or multi-function input rather than the hardwired safety circuit. or specific parameter settings to help bypass or test these safety terminals? Fault Codes & Appendix GPD 506/P5 and GPD 515/G5 (0.4
If Result A occurred, use a digital multimeter to trace the external circuit:
