Frequency conversion transformation scheme for electric single beam crane

The original control system of the electric single-girder crane was controlled by a ground contactor, but now it is transformed into a remote frequency conversion control according to user requirements. The editor briefly introduces the transformation plan for everyone.

Scheme for frequency conversion transformation of electric single-beam crane

Main advantages of variable frequency speed regulation

1. The main realization of frequency conversion speed regulation:

Energy saving; improve production efficiency; speed regulation; improve product performance; improve the automation of the production line and improve the use environment.

2. Main features of frequency conversion speed regulation:

2.1 Control the starting current of the motor to increase the service life of the motor and reducer.

2.2 Reduce voltage fluctuations of power lines and protect the power grid.

2.3 The power required at startup is lower to achieve energy saving and consumption reduction effects.

2.4 The controllable acceleration function enables the crane to accelerate slowly, the crane runs smoothly, and reduces mechanical wear.

2.5 Adjustable operating speed makes it more convenient to use.

2.6 Adjustable torque limit to protect the machine from damage.

2.7 The controlled stop mode makes the stop more stable.

2.8 Energy saving, 20% energy saving.

2.9 Reversible operation control can simplify the line and reduce the transformation rate.

3. Reconstruction plan

3.1 Hoist operating mechanism:

3.1.1 2-3T hoist running motor is ZDY12-4/0.4KW, voltage is 380V, current is 1.25A, select Siemens inverter, model is 6SL32240CA211UA0; or ABB inverter, model is ACS550-01-03A3-4; according to Incoming line reactor is optional for site conditions. The resistance of the braking resistor is 210 ohms, and the power is 0.3KW.

3.1.2 The 5T hoist running motor is ZDY21-4/0.8KW, the voltage is 380V, the current is 2.4A, and the Siemens inverter is selected, the model is 6SL32240CA211UA0; or the ABB inverter model is ACS550-01-05A3-4; the selection is based on site conditions Equipped with incoming line reactor. The resistance of the braking resistor is 210 ohms and the power is 0.4KW.

3.2 Hoist lifting mechanism:

3.2.1 2T hoist hoisting motor is ZD31-4/3KW, voltage is 380V, current is 7.6A, Siemens inverter is selected, model is 6SL32240CG255UA; 0 or ABB inverter model ACS850-04-010A-5+J400+N3050+ N5050; The incoming line reactor is selected according to the site conditions. The resistance of the braking resistor is 80 ohms and the power is 2KW.

3.2.2 3T hoist running motor is ZD32-4/4.5KW, voltage is 380V, current is 11A, select Siemens inverter, model is 6SL32240CG275UA0; or ABB inverter model

ACS850-04-018A-5+J400+N3050+N5050; Incoming line reactor is selected according to site conditions. The resistance of the braking resistor is 40 ohms and the power is 3KW.

3.2.3 5T hoist running motor is ZD41-4/7.5KW, voltage is 380V, current is 18A, select Siemens inverter, model is 6SL32240CG311UA; 0 or ABB inverter model

ACS850-04-030A-5+J400+N3050+N5050; The incoming line reactor is selected according to the site conditions. The resistance of the braking resistor is 20 ohms and the power is 6KW.

3.3 Trolley operating mechanism:

3.3.1 Two ZDY21-4/0.8KW operating motors for 2-5T crane trolley, voltage of 380V, total current of 4.8A, Siemens inverter, model 6SL32240CA230UA0; or ABB inverter model

ACS550-01-06A9-4; The incoming line reactor is selected according to the site conditions. The resistance of the braking resistor is 84 ohms and the power is 0.8KW.

3.4 Braking resistor

The brake resistors of the selected frequency converters for the hoist lifting mechanism, the running mechanism and the crane trolley running mechanism are all dust-proof and high-temperature resistant tubular resistors, which are fixed outside the control box to maintain good ventilation.

3.5 Frequency conversion speed regulation control mode

3.5.1 The frequency converter for crane operation and hoist operation adopts multi-speed digital V/f control mode.

3.5.2 The inverter for crane operation and hoist operation adopts PG-free vector control mode.

3.6 Limit switch

The mechanical and electrical limit devices of the two ends of the crane are set for the operation of the crane: the upper limit and the lower limit are set for the electric hoist.

3.7 Low-voltage electrical components

The main low-voltage electrical components are imported from Siemens and Schneider.

3.8 Mode of operation

Ground remote control operation, the remote control is selected from Taiwan Yuding brand.

3.9 Laying of electrical box

All electrical control boxes are fixed on the end beam of the crane or the inclined plate of the main beam for easy maintenance. There is no discharger control box on the electric hoist.

3.10 Wire and cable

The wires and cables required for the transformation of the crane are all high-quality brand-name products that meet the requirements of the national standard.

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