Trouble shooting for ghosting of ZMB94A double-sided offset printing machine

Trouble phenomenon: The user reports that the printing product has ghost images when the machine is accelerating or decelerating-both the upper and lower color groups have ghost problems, and there is no ghost problem when the speed is stable (whether it is running or high speed).

Troubleshooting:

Because the machine is used for a long time, it is necessary to start from the mechanical and electrical aspects to check this fault. And first of all, it is necessary to eliminate the mechanical parts that may cause this failure.

a. First check the guide pin of the pull plate mechanism, and match the guide pin to make it fit well. There are still ghost failures in the trial printing;

b. Check the jump condition of the main motor belt, there is basically no jump phenomenon when the speed is stable, there is a jump phenomenon when accelerating, and the jump phenomenon is more obvious when the speed is reduced, and the ghosting fault is serious when the speed is reduced, so adjust the frequency conversion The parameters of the inverter increase the second speed-down time of the inverter (the original value is 1.5, adjust it to 5 ~ 8), and the ghost fault is eliminated.

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