154HC Mast SectionThe electrical control system of Tower hoist should be equipped with the necessary electrical protection measures
The good operation of tower crane electrical control system can effectively protect the safety of tower crane equipment and operators. In order to protect the safety of the electrical equipment and staff of the tower crane, the electrical control system of the tower crane must be equipped with necessary electrical protection measures.
1. Main isolation switch.
Maintenance inspections of electrical equipment should generally be carried out in the event of a power failure. Therefore, there should be isolation switches or other isolation measures between electrical equipment and the power supply grid. When the isolation switch is disconnected, the disconnect distance and visible disconnect point must be hurriedly parked so that the maintenance staff can intuitively confirm that the total power supply circuit has been disconnected. In particular, it should be pointed out that when the air switch and the iron shell switch are disconnected, there is no obvious disconnection point and can not be used as a isolation switch.
2. Short circuit protection of total power supply.
When the electrical equipment is damaged by the insulation of the tower lifting, the short-circuit protection device of the total power supply should move quickly to cut off the faulty power supply. The total power supply short circuit protection device shall be completed by the fuse breaker circuit breaker.
3. Pressure loss protection of total power supply.
The loss of voltage protection of the total power supply means that the total power supply loop can be automatically disconnected after the power supply is interrupted; When power supply is restored, the total power loop can not be connected by itself without manual operation. In general, the automatically reset button is connected to the total power contactor coil or the unbuckling coil loop of the automatic circuit breaker to achieve the total power loss protection.
4. Zero protection.
The mechanism motor is controlled by a controller that can not be automatically reset. In order to prevent the controller handle from being at zero, the power supply of the tower crane is restored after the power supply is lost, causing the motor to start incorrectly. The tower crane is provided with zero-position protection
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