Main Applications and Features Adopt advanced frequency conversion technology to control the winch Automatic constant speed and manual speed control, automatic overload protection Automatic addition and subtraction to calculate the depth, with depth error automatic compensation. Use of commercial power or AC power generator Self-locking function while winch ascending and descending Steady in velocity without jitter in full speed range Technical Specifications Speed Range: 1~29.9 m/min Depth Error: ≤0.4‰ Depth Range: 0~9999.99 m Power Supply: AC220V±10% 50Hz ±5% Continuous Working Time: ≤24 hr Depth Pulse Equivalent: 0.25mm/pulse Working Temperature: -10℃~ +70℃ Volume: 305×200×220mm, Weight: ＜3kg Power Consumption: ＜1.5kW Constant Speed Range: 0.5~20m/min, Error: ±10%, ±1 digit