The gantry crane is a new type of small lifting gantry developed based on the needs of daily handling equipment in factories, incoming and outgoing goods in warehouses, lifting and repairing heavy equipment, and transporting materials. Used in mold manufacturing, auto repair factories, mines, civil construction sites and other lifting situations. The biggest advantage of the mobile gantry crane is that it can be moved in all directions and can be quickly disassembled and installed.
Working Principle
The mobile gantry crane is composed of an upper gantry frame, a lower gantry frame, a power system, a lifting system, a traveling mechanism and a suspension beam frame. Utilizing the rigid body characteristics of the concrete bridge, the suspension beam frames at both ends are connected to the bridge as a whole through supporting pressure plates and beam-tying wire ropes for lifting and transfer operations. There are self-propelled traveling mechanisms on both sides of the gantry crane, driven by low-speed and high-torque hydraulic motors, which can easily transfer precast beams within short distances.
Control Requirements
The VFD mainly controls the north-south movement of the driving motor and the lifting and lowering of the main and auxiliary hooks of the hoist. The VFD requires a large low-frequency starting torque and a sufficiently large low-frequency output voltage.
The starting, stopping, acceleration and deceleration of the walking motor are smooth and without impact. Since the weight may be 5-8 tons and is suspended in the air, if it moves north to south, the acceleration or deceleration is too slow or too rapid, which may cause the weight to swing in the air.
Vertical lifting and lowering requires the inverter to have a large starting torque and no hook wandering when starting and stopping.
Moving
| Parameter | Description | Set Value | Remarks |
| F0.00 | Control Mode | 0 | SVC |
| F0.01 | Start & Stop Command Source | 1 | DI Terminal |
| F0.18 | Acceleration Time | 3.0 | 3s |
| F0.19 | Deceleration Time | 2.0 | 2s |
| F2.01-F2.05 | Motor Parameters | ----- | According to Motor Nameplate |
| F2.11 | Tuning Option | 1 | Quiet Tuning |
| F5.00 | DI1 Option | 1 | FWD Run |
| F5.01 | DI2 Option | 2 | REV Run |
| F6.02 | Relay1 Output Option | 2 | Error |
Host & Aux Hook
| Parameter | Description | Set Value | Remarks |
| F0.00 | Control Mode | 0 | SVC |
| F0.01 | Start & Stop Command Source | 1 | DI Terminal |
| F0.03 | Main Frequency Source | 6 | Multi Stage Speed |
| F0.18 | Acceleration Time | 1.5 | 1.5s |
| F0.19 | Deceleration Time | 1.5 | 1.5s |
| F2.01-F2.05 | Motor Parameters | ----- | According to Motor Nameplate |
| F2.11 | Tuning Option | 1 | Quiet Tuning |
| F5.02 | DI3 Option | 12 | Multi Stage Speed 1 |
| F5.03 | DI4 Option | 13 | Multi Stage Speed 2 |
| F5.04 | DI5 Option | 14 | Multi Stage Speed 3 |
| F5.05 | DI6 Option | 9 | Error Reset |
| F6.03 | Relay 2 Output Optrion | 41 | User Defined |
| F6.28 | User Defined Variable | 0 | Running Frequency |
| F6.29 | Comparison Method | 11 | Output when ≥ F6.31 |
| F6.31 | Comparison Value | 1000 | 10.00Hz |
| FD.00 | Multi Stage Speed 0 | 40 | 1 Diode 20Hz |
| FD.01 | Multi Stage Speed 1 | 60 | 2 Diode 30Hz |
| FD.03 | Multi Stage Speed 3 | 80 | 3 Diode 40Hz |
| FD.07 | Multi Stage Speed 7 | 100 | 4 Diode 50Hz |
| FA.03 | Overvoltage Stall Gain | 0 | Off |
1. VB VFD adopts speed sensorless vector control, which has good dynamic performance, large torque at low frequency and stable output torque.
2. VB VFD is equipped with a braking resistor, which can run smoothly even when the acceleration and deceleration time is short.
3. Since the traveling mechanism travels north and south, the distance between the VFD and the motor is long. The iVFD is equipped with an output reactor to protect the insulation layer of the motor and extend the service life of the motor.
4. For the control and monitoring of the brake, you can set the brake opening and closing control through F6.31, and ensure the safety and reliability of the control through real-time status feedback of the brake and starting pre-torque compensation.