Vfd installation considerations when dating, for customers & suppliers

A start-up procedure must be followed for the safe and correct start-up of the VFD. For safe and dependable operation, all VFDs must be properly grounded. As such, you can avoid many problems by carefully planning your VFD installation prior to the actual work beginning. This voltage stability should be considered when running conductors to the drive and voltage drops should be calculated for long runs.

Thus, the optimum protection for a motor is thermal sensing of the motor windings. There are several Solomon S. These include electrical connections, grounding, fault protection, motor protection, and environmental parameters such as humidity and moisture. This is a common temperature rating for most units.

This type of protection will respond to motor overcurrent conditions of an overloaded motor, but will not detect over-temperature conditions. Altitude affects the heat dissipation capability of the heat sink and units in locations at ft m above sea level must be derated.

These control signals must be run independently of each other as well as separate from any power wiring.

Induced noises can produce erratic drive behavior that is very difficult to troubleshoot. The most common practice is the use of a motor overcurrent relay system that will protect all three phases and protect against single-phasing.

VFD control units should be installed in locations where the maximum ambient temperature does not exceed 40 [degrees] C [degrees] F. Basics Understanding Variable Speed Drives Part 3 Correct installation of variable frequency drives demands attention to vital factors such as location and environment, electrical connections grounding, supply voltage, and protective devices.

Understanding Variable Speed Drives (Part 3)

Better yet, specify additional spare manuals chemanager europe online dating the drive with your order. If higher ambients are expected, derating of the VFD may be required.

That's the book we always put aside until we have problems and need answers. Wall-mounted units employ a "chimney effect" for cooling of the heat sink and must be mounted against a smooth, flat, vertical surface.

All motors require overload protection. The sizing and installation of VFD line and load conductors should conform with the NEC and other appropriate local codes. Start-up by Facility Personnel Only. Completing the installation Installation of a VFD is no different than any other type of motor control.

If a wall-mounted unit is to be installed in a free-standing position, then plywood or a sheet of metal should be fastened to the back of the unit to ensure that chimney-effect cooling will be achieved. This sensing is then interlocked with the VFD's control circuit.

Many VFDs have short-circuit protection usually in the form of fuses already installed by the manufacturer.

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It's a good practice to make several copies of the manual; it seems they always end up in that great void with all the other lost manuals. Most fatal VFD failures occur about now. Larger free-standing VFDs require minimum clearances around them for sufficient air flow to circulate through them, assuring adequate cooling.

It's not unusual to have a V or 24V control circuit for start commands and a mA or VDC signal for speed control. At this point in time you'll probably want to power-up the VFD and give it a test.

Be sure to torque-bolt fuses in place according to the manufacturer's specifications to assure fast operation of fuses in case of a fault. This is usually the case on larger hp units. The drive installation procedure begins with a thorough reading of the drive's manual. A motor operating at reduced speeds will have reduced cooling; as a result, it may fail due to thermal breakdown of the motor windings insulation.

This normally calls for a grounding conductor to be brought back to a single-point grounding location, usually selected to be at the service. Turkel May 01, Correct installation of variable frequency drives demands attention to vital factors such as location and environment, electrical connections grounding, supply voltage, and protective devices.

In either case, the selection and sizing of these fuses is critical for semiconductor protection in the event of a fault. Proper cooling of the VFD's heat sink is essential for successful operation. If the installation is performed by outside contractors, a notice should be placed on the VFD reading: This direct motor ground to the VFD is required to minimize interference and for the ground-fault protection function of the drive to operate properly.

You should avoid installing units in mezzanines, direct sunlight, or near external heat sources because these locations usually have unpredictable temperature rises.

This is highly recommended for any motor that is to be operated for extended periods of time at low speeds. There are several key factors that must be considered to ensure a proper VFD installation. Control signal types can vary depending on the application.

Supply line power quality. As is the case with all electrical and electronic equipment, high humidity and corrosive atmosphere's are a concern. This manual will give you important information about receiving, storage, and planning for the installation before the equipment arrives.

Common sense, along with the manufacturer's guide lines and adherence to the appropriate code requirements, are all that is needed. In addition, a grounding conductor must be brought back from the motor to the VFD's internal grounding terminal.

The manufacturer's recommendations must be followed when installing or replacing fuses for the VFD. If you must install VFDs in such areas, take steps to provide necessary cooling.