Special software functions Many special software functions are available in the VFD for optimum crane operations. These facilitate performance monitoring in field weakening operation (higher speed at partial load), load spectrum calculation or speed monitoring, for example. The variable frequency drive can be connected to the existing joystick controller of cranes fitted with cab controls. Programmable characteristic curves make the VFD possible to adapt operation perfectly to meet the specific requirements of the handling application.
PORTAL CRANE STANDARD OPERATING PROCEDURES. Lock-Out and Grounding Procedures: 1. Portal yard crane operator requires a reset of the. Install the screws. Stay on top of overhead crane safety, 29 CFR 1910.179 with Quick Tips #107. Find these OSHA crane safety requirements: general, design, inspection, maintenance and.
( The characteristic curve to operate the joystick is freely programmable.) An intelligent brake logic system in the VFD enables the brake function to be monitored by evaluating the signals from the corresponding feedback contacts. Torque pre-control at start-up also enables heavy loads to be handled more precisely by hoist units. The VFD system bus (fibre optic cable) for Master/Slave applications is suitable for implementing electronic gearboxes by synchronizing two hoists for transporting long materials.
Furthermore, the Master/Follower function makes VFD possible to share the load/torque between two mechanically connected geared motors on one hoist unit. ( Crane operation can be precisely adapted to meet your specific needs using the variable frequency drive.) ( Four-rope grabs can be controlled to perfection with the variable frequency drive.) Full control of the functions The operator terminal offers a wide range of information.
Operating status information and actual values such speed, current, frequency, torque, etc. Can be read from the VFD. Various internal monitoring functions and the error memory in the VFD which can be read out from the operating terminal help to eliminate any malfunctions quickly and easily. ( The cause of malfunctions can be identified and eliminated quickly by means of remote diagnosis from the control centre.) Remote monitoring Several units can be networked within an installation using state-of-the-art fibre optic technology. This not only facilitates ease of commissioning from one service position, but also ensures that the installation can be monitored from a remote location by means of a communications module. This is the ideal solution for variable frequency drives that are difficult to access.
Tower Crane Installation
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The high-performance software makes any information that might be needed available at all times (e.g. Actual values, operating statuses, process data, etc.). Support for commissioning and diagnosis DriveWindow software makes commissioning even easier. The clearly structured user interface provides rapid access to all necessary parameters and actual values. Parameter files can be saved and loaded into variable frequency drives with ease for similar applications.
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Extended diagnostics functions (numeric and graphic monitoring) also provide a better overview for drives maintenance purposes. The frequency of the distribution system is fixed. When applied to the stator of the motor, it induces a rotating magnetic field in the motor that spins at synchronous speed defined by the equation. Considering only bearings for instance you can experience end of life with flacking, grease contamination, electrical pitting, grease evaporation, grease oxidation, controlled by VFD, etc.
Derating a variable frequency drive means using a larger than normal VFD in the application. Derating is required when a VFD is to be operated outside the normal operating range specified by the. If it's a 460V motor, the 1000V range should give a good indication. If the motor is 600 volts or less, 1000 to 2000 volt meggar is sufficient. Higher voltage meggar is fine, but no less than a 1000.
Using a variable frequency drive (VFD) in co-operation with a pressure sensor, the supply fan can maintain a precise flow rate. Since the system does not modulate, the pressure downstream of the.