Disconnect Switches for use with Variable Frequency Drives
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Description
Hubbell's Disconnect Switch for Variable Frequency Drives (VFDs) prevents downtime from out of sequence equipment shutdowns. The HBLDS3VFD integrates a verified break before break auxiliary contact factory installed in the HBLDS3 30 Amp disconnect switch enclosure that interfaces directly with VFDs.
The use of VFDs are being extended to a wide variety of motor driven equipment applications. VFDs control the frequency of the electrical power supplied to motors. When a motor disconnect is turned off in a low frequency state, disconnect contacts can potentially be damaged. This can cause potential risk of injury to workers and equipment malfunctions, resulting in costly down time and repairs.
Through extensive testing, Hubbell has found the use of an early break auxiliary contact safely disconnects the power by signaling the VFD that the motor disconnect is being turned off. The VFD then executes a coast-to-stop preventing any damage to the disconnect switch and the VFD output device.
The use of VFDs are being extended to a wide variety of motor driven equipment applications. VFDs control the frequency of the electrical power supplied to motors. When a motor disconnect is turned off in a low frequency state, disconnect contacts can potentially be damaged. This can cause potential risk of injury to workers and equipment malfunctions, resulting in costly down time and repairs.
Through extensive testing, Hubbell has found the use of an early break auxiliary contact safely disconnects the power by signaling the VFD that the motor disconnect is being turned off. The VFD then executes a coast-to-stop preventing any damage to the disconnect switch and the VFD output device.
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Disconnect Switches for use with Variable Frequency Drives