00:09Conveyor systems are widely used in a variety of manufacturing environments.

00:13From food packaging and bottling to automotive printing and pharmaceutical facilities.

00:19In fact, conveyor systems are what keep North American industries moving.

00:23Hubbell's new circuit lock motor disconnect switches designed for use with variable

00:28frequency drives are a must have for today's conveyor systems.

00:32The most common means of controlling today's conveyor motors is a variable frequency drive

00:37or VFD.

00:38These effective controllers adjust the speed torque direction and horsepower of conveyor

00:43system motors for maximum flexibility, reliability and energy savings.

00:48VFDs accomplish this by using high performance output devices to switch power on and off at

00:53specific intervals to create an efficient variable ac waveform.

01:00In industrial manufacturing environments. The national electric code or nec requires all

01:06motors to have a means of disconnect within line of sight of the motor and driven equipment.

01:10This allows the motor to be easily shut down for maximum safety and to enable maintenance is

01:15needed. Hubbell's circuit lock, disconnect switches are

01:19UL listed as a manual motor controller and motor disconnect to meet code requirements.

01:24The switch is placed in a UL type 4X safety enclosure and features a high visibility red

01:29handle using a standard disconnect switch between your VFD and motor loads has several

01:35inherent problems. VFD drive systems produce frequencies outside

01:40of the operating range of a standard switch interrupting and reconnecting power from the

01:45VFD to an active drive motor with a disconnect switch can potentially cause the switch

01:49contacts to weld shut.

01:51This can prevent the switch from properly and safely cutting off power which could result in

01:56risk of injury to personnel.

01:58In addition, if a disconnect switch is turned off while the drive is operating,

02:02power will be removed from the motor. However, the drive will continue to supply

02:06power to the disconnect switch. This condition can damage the VFD output

02:10devices causing downtime and expensive repairs.

02:14Hubbell has innovated a solution to these issues.

02:18Hubbell's improved 30 amp circuit lock motor disconnect switch for use with VF DS

02:22incorporates an early break auxiliary contact that enables VFDs to execute a coast to stop,

02:29preventing any damage to the disconnect switch and the VFD output devices.

02:34How does it work? The early brake auxiliary contact in a circuit

02:38lock enclosure is wired up to the digital input of the VFD.

02:43When turning off power to a motor, the early brake contact sends a signal back to the VFD.

02:48When the circuit lock handle is rotated to approximately 10 to 15 degrees,

02:53the signal enables the VFD to execute a coast to stop,

02:56preventing damage to the VFD. And the disconnect switch the power contacts on

03:01the circuit lock disconnect switch don't start to open until the red handle reaches

03:05approximately 40 to 45 degrees.

03:08The delay between the signal being sent to the VFD and the contacts opening is designed to be

03:13long enough to safely disable the drive. The early brake auxiliary contacts pre

03:18installed in the circuit lock disconnect switch prevents possible problems when used with VFDs.

03:24The early brake auxiliary contact device can also be purchased separately and easily

03:28installed on existing circuit lock motor disconnect switches in the field.

03:33The new circuit lock motor disconnect switch for use with VFDs from Hubbell is one of the

03:37only switches available that has been thoroughly tested to ensure maximum safety and

03:42prevent switch damage keeping today's industrial conveyor systems moving.