motor control, energy efficiency in mining industry, such as mine lifting machine

Excellent control performance decreases mechanical failure rate and improves production benefit

1. Powerful torque at low frequency eliminates hook slide phenomenon. Even if braking is performed in lifting midway, heavy load can be pulled up in midway and need not be placed onto flat ground for restart.
Under open loop control, the starting torque attains 180% rated torque under 0.25Hz running, under close loop control, the starting torque attains 180% rated torque under 0Hz running.

2. The hopper derail fault rate is evidently reduced. Smooth acceleration and deceleration avoid winch derail possibility and greatly reduce abrasion of machinery and rope.

Intelligent failure predication reduces maintenance workload

1. It reduces excess repair workload for contactor and speed regulation resistance of original system and greatly reduces maintenance cost. It is also provided with perfect multilayer protection functions and output fault indication to ensure you can solve problems in time without affecting normal production time.

2. The operation panel self-contains parameter copy function, greatly reducing debugging and maintenance workload.

Convenient for use, unchanged in operation habit, compatible with original system

1. Operator can still be skillful in operation for the first time after winch renovation.

2. Support switchover between power frequency and variable frequency. Compatible with original system after renovation, without changing anything in original system.

Multifold protection functions ensure system is more safety and reliable

1. Over-speed limitation protection function. When winch speed exceeds certain degree, it can automatically limit maximum speed, greatly improving safety.

2. Reliable contracting brake sequence control function. Giving sufficient torque in advance during starting and then releasing brake ensure it wouldn't skid down.
The brake is hold when it is about to stop but there is still torque output. The mechanical brake can be automatically hold to ensure safety when any fault occurs or any problem appears in safety circuit.

3. Super-strength system protection function, adaptive capability to environment and perfect protection functions as many as 32 kinds ensure safe and stable operation of system.
With powerful power grid adaptive capability, frequency conversion can normally work likewise when grid voltage fluctuation range is 323V - 480V.

4. It can perfectly cooperate with mechanical brake and safety circuit for application, can be compatible with safety circuit of original system and can perfectly cooperate with all types of mechanical brakes to guarantee overall system safety to an uttermost.

Maximized benefit and large energy saving space conform to energy conservation and emission reduction policy

1. When mine hoist remains at lifting status, the saved energy is proportional to rotation speed;

2. When hoister remains at drop status and motor remains at power generation status, if energy feedback unit is adopted, the saved energy is not only proportional to rotation speed, but also feedback energy is added.