During the refueling process, the oil machine makes an error or the user escapes the card. At this time, the balance in the card does not match the actual balance. The IC card becomes a gray card and cannot continue to refuel. The ash removal operation is required to restore it to normal and correct the card balance.
There are three ways to solve ash:
1. Re-insert the oil machine to automatically remove dust
2. Use this system to solve the ash function (Figure 1)
3. The automatic gray-out function of the customer card recharge interface (Figure 2)