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MPC Solution contains many comfortable features for the positioning of drives. They use a set of pre-defined instructions. Thus the handling becomes very simple. Here it doesn't matter whether you use the professional bus servos with positioning technology of well known manufacturers, prepared by us, or our positioning board B155 for the black box system. With the latter you have further possibilities in addition to the standard extent, like positioning after diagram etc..

Presently we support drive systems of Lenze and Siemens. You only have to connect the drive with the bus and select the type in the program. Now you can start positioning. Direct access to the many parameters of the drive is not necessary, but possible.

We support two kinds of positioning, ramp and time positioning.

Positioning unit B155

Ramp positioning

The ramp positioning is the standard positioning mode for most control systems. MPC-Solution offers a ramp positioning with end position declaration, maximum procedure speed, and start & brake acceleration. After the start command it waits until the signal "position reached" occurs. For this we use the MPC-Solution integrated step sequence mechanism. A further transmission function to another position is realizable.

For the user its often difficult to see the speed and the acceleration in relation to the procedure time. For this reason we implemented the time positioning in MPC Solution. Only the target position and the procedure time are indicated here. The delimitation of the speed is possible. The control calculates optimal values for the positioning of it and pays attention to the minimization of the mechanical wear.

The user gets the best overview by seeing the positioning curve graphically on the screen. The drive interpolates the curve in real time. Modifications on the screen will be synchronized with the motor at once, so that the next cycle is already modified.

Normally a drive positions between a minimum and a maximum position. It can reach each position between them. The end is often secured at both sides with limit switches. All supported drives are operable in this mode.

Positioning board B155 also supports the round axis. This is a closed, endless system, for example a round table with positions beyond the zero point.

Board B155 supports SSI interfaced absolute encoder with up to 24 bit resolution. The advantage of absolute encoders is that they transmit the actual position right from the moment of start.

Board B155 supports incremental encoders with up to 250 kHz. Incremental encoders are inexpensive. But its a disadvantage that they don't know the actual position right at the moment of start. MPC-Solution therefore provides different synchronization commands.

The B155 also supplies simple encoders (+/- 10V). Normal potentiometers, inductive position indicators or other receivers can be used. This method should only be used in special cases, since the resolution is limited.

By using stepper motors the B155 can also perform step counting. A position encoder is not necessary therefore. Though this is a very reasonable method, attention must be paid to the acceptable moment area, because the position will get incorrect by loosing steps.

There is an analog output on board B155 to submit maximum motor current on servo motors. Because current is almost similarly to torque, its possible to limit power. Samples for these are electrically powered compactors, and approaches to bedstops. MPC-Solution supports also the graphic preset of moment curves.