THE DM7 DECODER

Principle of operation
The DM7 series resolver‑to‑digital decoder provides an absolute encoder system in conjunction with any one of AVG Automation's single‑turn resolvers. As shown in the diagram on the next page, the resolver rotor winding is excited from a reference sinusoidal generator inside the DM7 unit. The ana­log output signals from the resolver stator windings, after sig­nal conditioning in the buffer amplifiers, are decoded to digi­tal format in the ratio in etric‑tracking converter. The zero‑off­set entered from the front panel keypad is continuously added to this digital value. The offset digital data is scaled, converted to the digital format as selected from the keypad and displayed on the front panel of the unit. The position information is also made available in a parallel format for external devices, such as PLC remote displays, etc.

Versatile

Programmable Full-Scale Offset for Easy Set-Up
The resolver can be mounted on the machine without any concern for mechanically aligning the resolver zero to the machine zero.  Once the resolver is coupled to the machine

shaft, the only thing you have to do is to bring the machine to a known position, say home position, and set an offset number from the front panel keypad until the display reads zero position. This is especially useful during initial start up in that it reduces the set‑up time. The offset can also be used to compensate for any machine wear.

Programmable Resolution: 20-4096 Counts­per-Turn The programmable scale factor feature provides you the flexibility of selecting the resolution in the field. Now you do not have to worry about defining the resolution at the time of ordering the unit. The scale factor can be programmed from the front panel and can be any number between 19 and 4095 resulting in resolution of 20 to 4096 counts per turn. This feature allows you to scale the position to desired engineering units (inches, mm, etc.), if required.