Traditional SC200 construction hoists adopt direct-on-line starting mode. The instantaneous starting current is several times higher than the rated current, which will cause strong impact on the on-site power grid. In many overseas construction sites in Africa, Central Asia and Southeast Asia, the power supply is unstable, and the hoist often trips or cannot start normally. The VFD variable frequency SC200 hoist solves this problem perfectly. It realizes soft start and soft stop, the current rises slowly without sudden surge, and it can keep running smoothly even with large voltage fluctuation, greatly reducing unexpected shutdown caused by power supply problems.
The VFD control system makes the lifting operation much more stable. The cage accelerates and decelerate gently without jolting or shaking. This greatly reduces the fatigue damage of the main frame, guide wheels, steel wire rope and brake assembly. Ordinary contactor control hoists have harsh braking impact, leading to frequent replacement of brake pads and vulnerable parts. Variable frequency braking is smooth and gentle, slowing down the wear of all mechanical components, so the service life of the whole machine can be extended effectively, and the maintenance frequency on overseas construction sites is greatly reduced.
Energy saving is another obvious advantage of the variable frequency model. Operators can adjust the running speed freely according to the load condition. The hoist runs at high speed with no load and reduces speed when fully loaded. It avoids the constant high-speed operation of the fixed-speed model. Under long-term continuous construction, the power consumption can be cut down significantly, which helps overseas contractors save electricity cost throughout the whole project cycle.
In addition, the variable frequency hoist runs with lower noise. It brings less noise pollution to the construction area, and the electronic protection function is more complete. The system has overload, over-current and phase-loss protection. Once abnormal conditions occur, the machine will stop automatically to avoid motor burnout. For high-rise building projects that need long-time uninterrupted vertical transportation, VFD SC200 dual-cage hoist can maintain stable operation day and night, guaranteeing the construction schedule without frequent maintenance interruption.
