Chain hoist targets less experienced operators

The VVF drive has no lifting movement thresholds, which enables accurate positioning of loads and greater operating flexibility. Depending on the value of the load, the type of movement and their own experience, the operator can choose the travel speed most appropriate to the operation. Lifting operations are safer and more accurate. With its minimum speed of approximately 0.25m/m, VARIO enables less experienced operators to manipulate loads with no risk of damage. Continuous control of speed also provides greater productivity. This feature now allows lift speed and motor torque to be dissociated: speed, for the reduction of cycle time to enhance hoist station productivity when running empty, and motor torque, for lifting under load to ensure precision travel with a maximum power margin.

The VARIO inverter system called ESR provides a maximum speed 1.5 times greater than the standard speed, and the integrated customised version of the deceleration ramp enables a lifting speed twice as fast as normal with light loads. Full speed can be used to a maximum of 40% of the rated load, the maximum motor speed remaining at 3000rpm. At 20% of the load, the rated speed is the equivalent of 150% of the listed speed. With nominal load, the rated speed is the equivalent of the listed speed.

With VARIO the life span of equipment is increased. Continuous speed control reduces mechanical shock by means of gradual starts and smoother halts. The reduction in the number and level of shocks to which the crane components or structure are subjected increases the life span of the frame. Continuous speed control, furthermore, enables the use of the electric brake during deceleration before application of the mechanical brake. Electrical braking reduces brake wear because the mechanical brake is only used when stationery.

VARIO has all the advantages of EUROCHAIN VR electric chain hoists that operate in their thousands around the world. It is designed to ensure maximum safety for the operator. The standard version is fitted with a new hoist load wheel concept with intermediate teeth for the drive chain, a Start/Stop palm button on the control box, a hoist disc brake, an electric safety limit switch for high and low positions, and complies with the EC directive relating to machinery. Lubricated for life to reduce maintenance, the EUROCHAIN VR gear reducer is furthermore calculated for very long operating periods of up to 3200 hours. High precision machining on the gear trains, moreover, ensures a very low noise pollution level of only 70dBA. The clutch system is easy to access for occasional maintenance operations, and its location in the gear box ensures the load is securely held by the brake whatever the operating conditions of the equipment.

VARIO has a modifiable ramp acceleration/deceleration time, supervised brake control, a slip control system with torque limiter and an electronic load sensor ensuring overload prevention. In its standard version, VARIO is also fitted with a load shock controller, an hour meter and a start meter together with a 50% active buffer system to offset the polygon effect.