You have reached the premier site for Volkmann™ drive repair.

We specialize in the repair of Volkmann drives also sold under the Graseby Volkmann and TB Wood's Volkmann names. We can provide all of your repair needs and application support as well as spare parts and replacement drives.

Volkmann 9000

These microprocessor controlled drives were originally developed in the early 1990's. They feature a digital LCD display, keypad, IGBT type transistors and PWM control.

The drive type is designated, for example, 94020M for Series 9000 460V, 20KVA/HP, and medium frequency.

Model numbers start with 72,

75, or 76; for example, 75010G1.

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Volkmann 8000

Controlled by discrete digital logic and analog circuits, these Volkmann

drives were developed in the mid 1980's. They feature control terminal interface, BJT type transistors and 6-step, variable DC bus control.

Model numbers start with 71;

for example, 71006AA.

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Volkmann AD-1

Controlled mainly by analog circuits, these drives were developed in the late 1970's. They feature control terminal interface, BJT type transistors, and 6-step, variable DC bus control.

Model numbers for drives in enclosures start with 70; for example, 70321AA.

An example of an open drive model number would be AD-1-G4M150.

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Volkmann AD-2

These microprocessor controlled drives were developed in the early 1990's. They feature digital LED

display, keypad, IGBT type transistors and PWM control.

Model numbers are designated, for example, AD05V4B3N for AD-2,

5HP, 460V, 60Hz, 3 Phase drive

in NEMA 12 enclosure.

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