Yaskawa inverters are among the world's most renowned inverter manufacturers, produced by Yaskawa Electric Corporation of Japan. Rooted in Yaskawa's deep understanding of electric motors, Yaskawa inverters are recognized globally for their superior control performance and excellent product quality, reflecting Yaskawa's philosophy of "contributing to society and public services through unique technology." The newly launched "H1000" heavy-duty inverter completely replaces the "G7" series. Featuring high-performance current vector control, it can drive IM/PM motors, outputting 200% torque from zero speed. It boasts zero-servo functionality, high starting torque, DWELL functionality, over-excitation braking, and comprehensive online self-learning capabilities. In the hoisting industry, it offers high output, high performance, safety, and high reliability. Dedicated hoisting software is provided for the hoisting industry, including specialized brake timing functions, collision stop functions, light load speed-up functions, overload detection, and travel limiting functions. Employing Swing PWM technology, it suppresses electromagnetic interference caused by frequent start-stop cycles of the hoist.
A construction site for a commercial building needed to upgrade its construction ladder. The previous ladder used a domestic brand inverter, which experienced multiple malfunctions, electromagnetic interference, and lacked proper lifting software. The client, aware of Yaskawa's high brand recognition and market share in the hoisting industry, decided to replace it with a Yaskawa inverter. The ladder uses two 15kW motors with a rated current of 33A. The cage lifting capacity is 4 tons, the load capacity is 2 tons, the lifting speed is 60m/min, and it includes a brake. The inverter is required to have electromagnetic interference suppression and dedicated hoisting functions. Based on these requirements, the following configuration was provided: HB4A0091 (37kW + lifting soft start), 45kW braking unit: CDBR-4045D, braking resistor: 3000W 50 ohms.
Parameter Setting and Debugging: After confirming the correct wiring of the main circuit and control circuit, the inverter is powered on for debugging. The parameters in the parameter table above are set via the operation panel on the inverter. The Yaskawa H1000 inverter comes standard with a Chinese operation LCD panel, making parameter setting very convenient. After parameter setting, several stages of testing were conducted according to the national standard test rules for construction hoists: no-load test, rated load test, and 125% rated load test. After appropriate parameter adjustments, all tests were passed. During debugging, if hook slippage occurs, the brake frequency can be appropriately increased, but it should not be set too high, otherwise the inverter is prone to malfunction. Generally, it is set within 0.3~2Hz. The following points should be noted during debugging: 1) During the no-load test, if vibration occurs during lifting, adjust parameter N2-01. If vibration occurs during descent, adjust parameters S1-02 and S1-03. 2) During the rated load test, if the brake engages but shows a downward trend, adjust parameters S1-12~15. If slippage occurs during lifting, adjust parameter S1-09. 1) Vibration during lifting/lowering: Adjust parameters C4-02, N2-01, and 02. 2) Slippage during lifting in overload tests: Adjust parameter S1-09. 3) Excessive current during lifting in the lowering process: Adjust parameter S2-03. 4) Friction brake engagement during startup: Adjust parameters S1-05~08 and adjust the brake opening current. 5) Friction brake engagement during stopping: Adjust parameters S1-14 and 15. 6) Slippage during rapid jogging: Adjust parameters S2-01 and 02. Safety is the most important standard for construction hoists. Safety tests must be conducted according to national standards during system commissioning. During no-load commissioning, test whether the upper and lower limit switches and the limit switches of each cage door operate according to design standards; after commissioning at 125% rated load, adjust the overload protector to 110% and conduct an overload test. Fall protection testing is usually carried out on construction hoists equipped with fall protection safety devices. The fall protection safety device is an important component of the construction hoist, and it is relied upon to prevent the occurrence of cage fall accidents. All hoists used on the construction site must undergo a fall test every three months. The fall test can be carried out by increasing the output frequency of the frequency converter, so that the motor drives the cage at a simulated fall speed, and see if the fall protection safety device activates.
