Before you choose a contactor according to your requirements, it is important to gather some information regarding our product usage. As you know, Forklift is a compact commercial truck with a power-operated forklift frame attached to the front side which can be lowered and raised for placement to lift or push it under a load. Forklifts meet the requirements of various sectors including supermarkets and other large warehousing amenities.
High-geared forklifts and logistic vehicles must have the capability of quickly and carefully transporting loads of quite a few tons to some maximum lift altitude. The vehicle should be noise-free and environment-friendly. In order to achieve these basic requirements, electric forklifts are the preferred choice. But after choosing the electric vehicle, there are some factors related to them which need to be addressed. To be specific, they require immediate traveling and lifting with emergency stopovers. The operating electrical energy requirement of the industrial electric truck is the usual voltage level synchronized with the current level up to 300 A maximum.
The following information will help you increase your knowledge regarding the implantation and benefit of DC contactors in the forklift trucks and understand the circuitry working underneath the system. As it is said, ‘without the knowledge, action is futile’.
The basic purpose of having DC contactors in the forklift is to reliably disconnect the circuit during emergency conditions. The three-phase motors installed in the industrial vehicles and trucks are controlled by the invertor. The mechanism of controlling inside the inverter is undertaken by the semiconductors. In case of any technical problem in the semiconductor, the invertor may not be able to switch off the connection in case of emergency, the vehicle will continue functioning.
Activating the stop switch for emergency, the contactor drops out, which is powered by central electronics. The systems disconnect from the power supply and therefore, the vehicle is removed from danger. Contactor mainly plays the role of backup and is used as an alternate to the non-functioning inverter on the DC side.
The type of contactors installed in these type electrical circuits of vehicles are Automotive contactors. The applications of automotive contactors consist of capacitive, resistive and inductive load. To keep it simple for you to understand, we are discussing the two main applications which are related to the forklift’s circuit.
1.Resistive load (Heating)
The resistive load is the type, which utilizes same amount of current as that of the voltage. They are typically used to convert electric energy into some other form of energy and in our case, it is heat.
2.Capacitive Load (Engine management)
The capacitive load has large inrush current but low stable current. The lamps are usually considered as capacitive loads. In our case, it is used in engine management.
Motor or electric circuits such as in forklifts, combination of loads are installed which act as contactors. Further details have been discussed below.