The SIMOTRAS HD device comprises:

• The power unit
• Basic electronics

Power unit

The power unit is a 3-phase thyristor AC power controller in a compact design. Two additional thyristor modules in the lateral branch of the power unit enable reversing of the rotating field, and therefore 4Q operation of the drive. Current transformers in 2 phases generate the actual current value for current control.

Basic electronics

The basic electronics contains the gating unit that activates the thyristors. It generates line-synchronized firing pulses. The control electronics is isolated from the line potential via firing pulse transformers.

All device settings (e.g. controller parameters, limits, etc.) are stored in the device in a non-volatile memory. Adjustment is performed digitally, via the operator panel on the device. The values are therefore easy to reproduce at any time.

Depending on the load conditions, the converter operates in motor mode (driving direction of rotating field, 1st and 3rd quadrant) or in braking mode with reversing current braking (2nd and 4th quadrant). Through omission of the conventional stator contactors, fast torque reversal is possible, with resulting high control dynamics.

Supplementary modules

See section Electronic options.