Crane circuit

The crane circuit consists of two parts: the ground control part and the aerial crane control part. When readers read this kind of circuit diagram, they can read them separately for clarity
. For example, the driving circuit shown in Figure 2-12. One part is the control component installed in the ground power distribution cabinet, which is used to
provide the three-phase AC power to the overhead crane . The other part is the aerial crane control part.
    (1) Ground control part In the ground control part circuit, QS is the power switch; FU1-FU4 are fuses; SB1 is the power supply cut-off
button switch; SB2 is the power supply on-button switch; KM1 is the AC contactor, including a set of KMl -1 normally open contact is used for self-locking, and
there are three sets of normally open main contacts KMl-2-KMl-4 for controlling the three-phase power supply of the driving l FT1 is a thermal protection relay.
    (2) The aerial driving control part SB3 is the main switch that controls the driving power supply. Slk is the main switch that controls the driving power supply.
KM2 is an AC contactor, which has a set of normally open contacts KM2-1 for self-locking. , and there are three sets of normally open contacts KM2-2~KMZ-4 used to control the three-phase AC power supply used by
the motor and control circuit } SB5-SB10 are 6 point push button switches § Only the AC contacts
used The control sequence is up, down, left, right, front, and back.