The cutting head is always up in automatic mode

1.Problem description:The cutting head always moves upward when the equipment is powered on,and does not stop.When switching to manual mode,the motor movement can be controlled,and then the cutting head has been lifted up when switching to automatic mode.
2.Possible cause analysis of failure:Whether the upper limit switch is broken,the lower limit signal is valid and always in the triggering state,and the collision alarm signal is valid and always in the triggering state.
3.Solution:First check whether the upper limit switch is effective.Secondly,through parameter setting,the collision alarm and limit are prohibited.If the phenomenon disappears,it means that the limit or collision alarm is triggered.Also,check that the limit polarity set corresponds to the limit switch type.