Why Choose Wireless Remote Control ?

Why Choose Wireless Remote Control ?
 

Nowadays, wireless remote control is widely used in 20 ton overhead cranes, and the use of remote control operation has the characteristics of improving working conditions and convenient operation.
 

Especially in some stone slab production enterprises, the wireless remote control operation mode is widely used, which avoids the driver's personal accident that may be caused by the derailment of the crane or the fall of heavy objects.
 

When using the wireless remote control method, it is different from the traditional cable hand controller in terms of safe use.

Safety requirements for wireless remote control of cranes
 

1. The crane with wireless remote control should have various protection functions of the original crane, such as zero position, overcurrent, stroke and other protections.
 

When the remote control uses non-automatic reset joysticks, it is required that all joysticks should be at zero position before the operation can issue control commands. When the master controller and contactor control, the master controller must be at zero position, the remote controller can connect to the main power network of the crane.
 

When the crane unexpectedly loses power, the remote control should stop working. When the power supply is restored, the remote control must go through the correct start-up procedure to connect to the main power circuit of the crane.

When the power supply voltage of the remote controller is insufficient, it should be able to issue a stop command.
 

2. Cranes using wireless remote control should be equipped with a main contactor or an air circuit breaker that trips under pressure to cut off the main power supply of the crane.
 

The power supply of all institutions must be drawn out from the outlet of the main power contactor.
 

The action of the main power contactor or the circuit breaker with a voltage loss trip line should cut off the main power supply of all institutions and stop the operation of all institutions.
 

3. For cranes using wireless remote control, there should be an obvious remote control indicator light on the crane, indicating that the machine is operated by remote control.
 

4. When a crane is operated by both the remote control and the driver's cab, the interlocking between the two should be realized.
 

A transfer switch must be set at the entrance of the driver's cab.
 

5. The forward and reverse running relays and contactors should have electrical interlocks, if necessary, the contactors can be equipped with mechanical interlocking, and the forward and reverse running codes of the motion mechanism in the receiving processor should have software interlocking.
 

6. The radio remote control system should have the ability to resist the interference signal of the same frequency, and it is not allowed to malfunction when it is interfered by the same frequency.
 

The control receiver is directly connected with the strong current system. There will be a lot of various interferences, so its reliability and anti-interference performance are very important, which is the basis for the system to be put into use.
 

The output of the system is to drive the relay and contactor to control the operation of the motor, so it is necessary to isolate the weak current and strong current systems. Because the interference in the industrial field is too great, there is often pulse interference, so attention should be paid to the selection of the receiver chip at the control end.
 

The receiving sensor is connected to the receiver host with a cable, and the cable should have a good shielding function. The illuminance of the receiving sensor is 80001x in daylight and 20001x in light. When the distance from the welding arc is greater than 6m, it should be able to work normally. If it exceeds 6m, it can refuse to operate and give an alarm or passive emergency stop, but there is no malfunction.
 

7. The shell of the receiver and the intermediate relay box should be reliably connected with the steel structure of the crane.
 

8. Safety requirements for the emergency stop function of wireless remote control devices.
 

The emergency stop function includes active emergency stop and passive emergency stop.
 

Active emergency stop means that the driver sends an emergency stop command through the transmitter to cut off the main power supply on the crane and stop the movement of various mechanisms of the crane.
 

Passive emergency stop means that when the receiver fails to detect a normal signal within a certain period of time or the receiver (control system) fails, it can cut off the power supply of the channel and stop the operation of the various mechanisms of the crane.
 

In order to prevent misoperation, the active emergency stop switch should not be automatically reset. The driver sends an active emergency stop command through the transmitter until the receiver intermediate relay control terminal outputs the active emergency stop command. The required time should be less than 0.5s.
 

This command cuts off the main power supply and is the highest priority. When no high-frequency carrier or data signal is detected, the passive emergency stop function should be implemented, and the total power supply of the channel must be cut off within 1.5s. When the sudden noise interference of the channel exceeds ls or the correct address code cannot be detected at ls , the channel power should be cut off.

Through the above introduction, it can be known that the use of wireless remote control cranes can meet various production environments. In the case of paying attention to the safety of use, compared with manual operation with cables, wireless remote control can reduce labor, save time, improve production efficiency, and avoid personnel injuries and equipment losses caused by misoperation.