One of the most demanding machines in mining, cement, quarrying and aggregate production is a crusher. The inertia of motor during startup is big, the resistance of load is big and the mechanical impact is strong. If the crusher is started across the line directly, it may cause high starting current, voltage drop, coupling stress and unexpected protection trips.
Soft starter for crusher can be a practical solution of motor starting to crushing system which operates at fixed speed after startup. It allows the motor to accelerate smoothly, reduces electrical impact and protects the mechanical system from unexpected torque shock.
1. Why Crushers Need Controlled Starting
Many crushers operate under severe service conditions. The motor must overcome the inertia of the rotor, the crushing chamber and the connected gearbox system. The machine may also be started with material still in the crusher at times.
A sudden start can put increased stress on the motor shaft, coupling, belt, gearbox and electrical system. This may lead to the higher maintenance cost, reduced equipment life and unstable production over the time.
Controlled start method decreases startup impact and improves reliability of crushing line.
2. How a Soft Starter Helps Crusher Motors
A soft starter gradually increases the voltage applied to the motor at start-up. This allows the crusher motor to ramp up smoother and more controlled instead of being slammed with full voltage immediately.
This can help reduce starting current which can be helpful for crusher applications, reduce mechanical shock and reduce the risk of nuisance trips. It also protects the power supply system from sudden current impact.
A soft starter does not give you the constant speed control that a VFD can. However, if the crusher needs only smooth starting and then running at fixed speed, a soft starter for crusher may be a more cost-effective choice.
3. RENLE Soft Starter Solutions for Heavy-Duty Crushers
RENLE provides low-voltage and medium-voltage soft starter solutions for industrial motor starting. When selecting the crusher motors, the motor power, rated voltage, rated current, load condition, starting torque and working environment should be considered.
In mining, cement and quarrying sites dust, vibration, high temperature and heavy load conditions are common. So, before selection, check cabinet protection, cooling design, bypass configuration and protection functions.
For large crusher applications, a medium voltage soft starter may be required depending on the motor voltage and project requirements.
4. What Buyers Should Check Before Selection
Buyers should prepare motor nameplate and basic application details before selecting a soft starter for crusher.
Important information is motor power, voltage, rated current, crusher type, start condition, start frequency, start time, working hours, ambient temperature and cabinet installation environment.
It is also important to determine whether the crusher is starting with load or without load. Heavy-load starting may require a larger capacity soft starter and careful setting of the parameters.
If you need a soft starter for crusher, please forward us your motor nameplate, crusher type and site conditions. RENLE engineers can help you check the suitable soft starter configuration for your project.
