KD600 series inverter driving before and after the application scheme

Overview

Bridge crane, commonly known as "driving", is a kind of lifting machinery widely used in industrial and mining enterprises, its operating mechanism is composed of three basically independent driving system, car driving system, hook driving system, K-DRIVE inverter to the above three driving system successfully reformed, the following mainly describes the transformation process of the driving before and after walking system.

KD600 series inverter driving before and after the application scheme

Scheme Advantages

Field oriented current open-loop vector control, fully decoupled motor variables, large low-frequency torqu-e, fast response, etc;
KD600adopts PG free open-loop vector control mode and vectorized V/F mode, and amplifies the power le-vel configuration of the first gear;
Frequency range: 0.5-600Hz segment setting, stepl-ess continuous adjustment;
Working voltage range: 380V ± 20%, and the bus vol-tage drops to 360VDC instantly for trouble free ope-ration;
Overloadcapacity: 150% of rated current, 1 minute allowed; 200% rated current, 1s allowed;
Torque characteristics: starting torque, greater than 2 times of rated torque; Low frequ- ency torque, greater than 1.6 times of rated torque at 1Hz; The braking torque is gre- ater than the rated torque.

Operating characteristics

The crane lifting mechanism has a large starting torq-ue, which usually exceeds 150% of the rated torque. If overload and other factors are considered, at least 200% of the rated torque shall be provided during the starting and accelerating process;
Whenthe lifting mechanism runs downward, the motor will be in regenerative power generation state and must be energy consumption braking or regenerative feedback to the grid;
The load of the lifting mechanism changes dram-atically when the lifted object leaves or touches the ground,and the frequency converter shall be able to control the impa-ct load smoothly;
Asthetraveling speed of the front and rear travel-ing mechanism of the crane is not high during the mechanical design, the converter can be used for proper overspeed to improve the working effic-iency.

Simple wiring diagram

Parameter setting and description (left and right motor traveling parameters)

Parameter	Explain	Parameter setting	Explain
P0-00=0	VF control	P5-00=1	forward
P0-04=1	External terminal start stop	P5-01=2	carry out later
P0-06=1	Digital frequency setting	P6-00=2	Relay 1 fault output
P0-14=60.00	Maximum frequency	P4-01=1.6KW	Connected motor power
P0-16=60.00	Upper limit frequency	P4-02=380V	Motor rated voltage
P0-11=60.00	Digital setting frequency	P4-04=3.3A	Motor rated current
P0-23=3.0s	Acceleration time	P4-05=50Hz	Rated frequency of motor
P0-24=2.0s	Deceleration time	P4-06=960R/Min	Rated speed of motor
Note: When one frequency converter is used with two motors, it is strongly recommended to install a matching thermal relay at the front end of each motor to protect each motor.

Operation effect analysis

KD600 series frequency converter has carried out frequency conversion transformation on the traveling system, and the tr-ansformation effect is relatively ideal, mainly shown in:

The soft start and soft stop during startup are realized, which reduces the impact on the power grid;
Afterusing the frequency converter, the original shift contactor and speed regulating resistor are omitted, which not only saves the maintenance cost, but also reduces the downtime for maintenance, thus increasing the output;
When the main hook works at 5Hz~30Hz, the energy saving effect is very obvious;
Thefrequency converter is used to control the front and rear traveling, and the left and right traveling mechanism series can realize the over frequency work. Under the premise of ensuring safety, the work efficiency is greatly improved, and the maintenance workload of the traveling equipment due to frequent replacement of AC contactors is also reduced.

Closing remarks

The frequency converter is used to control the front and back walking and the left and right walking mechanism series, which can realize overclocking work, greatly improve the work efficiency under the premise of ensuring safety, and also reduce the maintenance workload of driving equipment due to frequent replacement of AC contactors.

Application site

Application site