he GPD 333 is 1/4 the size of conventional PWM drives, while providing more programming capability. The drive is available in 230 and 460 VAC ratings, and is NEMA 1/12 enclosed. The NEMA 1 enclosed version is also available in an optional NEMA 12 enclosure.

A 16-bit microprocessor handles all logic functions, as well as the complex, sine-coded PWM-generating algorithms that control IGBT switching. The GPD 333 provides the benefits of all-digital control; adjustments that won't drift or vary with line voltage or temperature.

The 16-bit control logic of the drive also means more software-executed features and more programmable parameters to customize the drive to each specific application. These include such features as two independent accel / decel times, overtorque detection, auto torque boost, DC injection braking, speed search, critical frequency rejection, power loss ride-thru, auto restart and stall prevention.

The GPD 333 is also network compatible. MagneTek's unique NCL communication network accommodates multiple devices (drives) on a single network node. From the networks perspective, up to 30 MagneTek drives are seen as one node, yet all individually addressable. As a result, 882 GPD drives can be controlled by a single Modicon Modbus Plus network.

In addition to NCL, the GPD 333 offers connectability to DeviceNet. The DeviceNet communication network supports up to 64 nodes on a single network at data rates up to 500 Kbaud.

The GPD 333 drive is ideally suited for applications such as pumps, fans and blowers. It is powerful enough for a wide array of sophisticated industry control such as material handing, machine tool, commercial laundry, food processing, and packaging. Wherever high performance in a small size is required, the GPD 333 is the perfect choice. NEMA 4/12 also available.

The GPD 506 drive is the 6th generation of technological advancements in this series of adjustable frequency AC drives. Each generation provided a step change in user benefits - by increasing performance, increasing reliability, or reducing cost. The GPD 506 is a special purpose drive with application-specific features that add significant "more-for-less" benefits.

• ASICs...Application Specific Integrated Circuitry increases reliability.
• Dual-bridge, 12-pulse rectification...By using a phase shift input transformer with dual secondary, input current harmonic distortion factor can be reduced over 90%.
• Energy savings control...Automatic output voltage adjustment in response to actual motor loading. Real-time energy savings based on motor algorithms. Increases motor efficiency by several %.
• Simplified operator keypad…16 function LEDs provide the perfect execution of old-fashioned simplicity of discrete indicator lights and the modern sophistication of keypad programming and control.
• Built-in PID control...Eliminates cost of external device.
• Built-in power consumption monitoring...Built-in kW display eliminates the need for external signal conditioner.

Designed for Special Purposes

The GPD 506 is designed specifically for applications where overload and starting torque requirements are well known, where excess capacity is wasted investment. Common applications of this type include fans, centrifugal pumps, grinders, buffers, low-viscosity mixers, centrifuges, commercial laundry machines, and saws. The GPD 506 overload rating of is perfectly suited to applications like these.

The design features of the GPD 506 were selected to provide application-specific benefits. PID control, energy saving control mode, power data display, communications port, bypass configurations, NEMA 1/4/12 enclosure choices, current harmonic reduction choices, and the right collection of I/O signals and interface controls lead to one conclusion - the GPD 506 is the best choice in special purpose AC drives.

Fifty years ago, MagneTek provided adjustable frequency drives in the form of variable-speed-driven alternators. In the ‘60s, MagneTek introduced solid-state thyristor inverters to replace the alternator, significantly reducing the cost of adjustable frequency drives.

In the early '70s, we introduced the first commercially-available Current Source AC drive. Although there was a price premium, AC drive performance was unmatched. This drive embodied the fundamental control concepts found in today’s vector control drive.

Throughout the '80s, PWM technology improved, both in performance and reliability, and in the late '80s, MagneTek brought one of the most advanced microprocessor-based PWM AC drives to market.

In 1990, MagneTek introduced the IGBT-based GPD 503 with instant success and dominant market position, followed by the VCD 703, flux vector control drive.

Now, MagneTek introduces the next technological achievement, the GPD 515. Backed by 50 years of continuous advancements, the GPD 515 utilizes state-of-the-art IGBTs, SMDs, ASICs, 32 bit processing, motor algorithms, auto-tuning, and other benefit-laden technologies creating the cutting edge in AC drive design.

The most spectacular achievement is the flexibility provided to our customer, with a single drive platform offering traditional V/Hz, sensorless vector, and flux vector control performance.

Combined with MagneTek’s inverter-duty induction motors, no competitive drive can match the torque and speed performance of the GPD 515 - the world’s most flexible drive.

In 1993, MagneTek introduced the RVS-D, one of the first digital soft starters in the market. Today, MagneTek introduces the next level of starter sophistication; the RVS-DN.

The RVS-DN can communicate with AC or DC drives on a common network using the optional RS485/Modbus RTU serial communication port. Parameter modification, start/stop control, reset, and monitoring can now be controlled from a wide variety of PLC or PC controllers. The RVS-DN incorporates microprocessor-based digital circuitry, sophisticated motor protection with digital accuracy, a smaller frame size from 8 to 72 amps, and a rugged, heavy duty, fully-rated design.

The RVS-DN is used with standard 3-phase induction motors. The RVS-DN provides an adjustable voltage increase to the motor for soft start and smooth, stepless acceleration. Mechanical shock is reduced while drawing the minimum current required to start the motor.

For pump applications, the RVS-DN is the only soft starter to offer six control curves. These curves are used to eliminate surges commonly seen during starting and stopping of a centrifugal pump. A dual adjustment feature allows two settings for programming starting characteristics and motor FLA. By simply closing a contact, the RVS-DN can use a second set of parameters. This feature is ideal for starting loaded or unloaded conveyors. With the second motor FLA setting, the RVS-DN can also be used with two speed motors.

The RVS-DN incorporates special starting characteristics suitable for generator supply. By simply turning on a dip switch, you can alternate between starting characteristics for main supply or generator supply through a contact closure. These starting characteristics allow the RVS-DN to overcome nuisance tripping caused by an unstable supply.

The RVS-DN offers additional features such as slow speed, electronic reversing at slow speed, and energy saver. An auto reset is available for the motor insulation alarm, phase loss, and undervoltage.

MagneTek's RVS-DN is the only soft starter to offer an optional built-in megger test to automatically measure the motor's insulation level and prevent starting if low insulation resistance is detected.