Drive dimensioning with PFAD Plus

Use PFAD Plus to dimension three-phase drives with SIMOVERT MASTERDRIVES in the variants "Vector Control" or "Motion Control", including all the related system components.

Single drive - example

A drive system consists of the load (machine), a gearbox in some cases, the motor, the power part (converter or inverter and line entry) and other system components (such as brake unit, cables, output reactor, line reactor).

Possibilities of the drive design

Possibilities of the drive design

Depending on the type of the drive task, PFAD Plus offers various drive design possibilities:

Load cycle for drives with frequently occurring overload; i.e. specification of , M_load(t) and n_load(t)

Depending on the required dynamic properties of the application, selection is possible between "Vector Control" and "Motion Control".

Selection criteria

PFAD Plus does not make a global allocation of motor, converter, inverter, brake unit, feeder unit, feeder/energy recovery unit on a catalog basis, selection is rather made on the basis of the load state. In many cases, this results in a more cost-effective combination. Required minimum values will of course be observed. Installation altitude and ambient temperature are taken into account through the corresponding derating curves.

Help

A configuration is processed in specified configuration steps. Each configuration step is executed in a menu-driven way. No entry can thus be forgotten. Verification of all input values ensures faultless configuration. An extensive help system explains all entries and supports the user in selecting a suitable drive configuration for his or her drive task. Existing configurations can easily be converted into a new configuration - merely change the data and save under a different name. A typical configuration can be called for each possible drive configuration, enabling the user to get familiar with PFAD Plus in an easier way. This is of particular interest for beginners. These examples can of course be copied and used for own applications.

Selecting additional system components

PFAD Plus offers a menu-driven selection of all system components that are possible for a specific configuration. These system components are assigned to the configuration steps power supply, load/motor, converter, inverter, output, feeder converter, input. Additional options are possible for cabinet units. In the "output" configuration step, for example, PFAD Plus determines the output reactor that is required when the motor cable exceeds a certain length. The necessary cross-section is determined on the basis of the cable type, the installation method, and the ambient temperature of the motor cable.

System perturbation calculation

To be able to assess the harmonic contents of the feeding mains, PFAD Plus permits the system perturbation at a specific load point to be calculated for an operation with a converter or with a feeder unit plus inverters. The same applies to a 12-pulse operation with two feeder units and a three-winding transformer. Using a simulation program, PFAD Plus determines the time characteristic of the current and voltage values at the primary and at the secondary side. Using a harmonic analysis, the harmonic contents of the currents and voltages at the primary and secondary side are calculated and output up to the 49th harmonic component. These values can directly be compared with the limit values that are permissible according to the individual standards. In addition, PFAD Plus determines the distortion factors of the primary and secondary voltage.

Calculation results of 12-pulse system perturbation

Output / results

PFAD Plus supplies an extensive documentation for each drive configuration that contains all input values, the calculation results, the characteristic curves (such as motor limit curves) together with the load levels, and a parts and ordering list. Depending on the configuration, the specifications of motor, converter, inverter, feeder unit, feeder/energy recovery unit can also be printed. Parts and ordering list and specifications can, via the clipboard, be entered in Microsoft Office applications.

Thermal and dynamic limit values of a servo drive

Update to Version V2.80

As compared with the PFAD Plus Version V2.70 available since June 2003, the new Version V2.80 offers many improvements and new functionalities. This comprises mainly the following items:

In addition, we have corrected some errors.

The update to the new PFAD Plus Version V2.80 is available at no cost for all users having acquired a PFAD Version that was created with the CD-ROM V2.10 resp. the new Setup V2.60-3.