MTS Systems Series TBF-R User Manual download pdf (Page 12)

2.5 Function Description

The function of the amplifier is described by means of the block diagram shown in Figure

2.5.1 Power Supply

• Power amplifier:

Rectification and filtering form the direct voltage (intermediate circuit voltage UB),

necessary to operate the power amplifier, from the AC power supply. This

intermediate circuit voltage can also be fed directly as d.c. voltage.

• Electronic supply

The electronic supply takes place internally through a switched-mode power supply

from the intermediate circuit voltage.

2.5.2 Control System

• Speed controller and current limiting

The nominal speed value can be fed through the input differential amplifier. In the

stage connected on load side the positive and negative set values are suppressed

separately (limit switch logic). The speed set value, conditioned by this way, is then

injected to the speed controller. The inverted tachometer voltage, injected to the speed

controller, in this device, is gained from the resolver signals, by means of a

corresponding procedure. The current set value is then available at the output of the

speed controller.

There are different possibilities to limit the nominal current:

The I

t current limiting reduces the current set value, using the following procedure:

The actual current values are rectified, quadrated and run to a low pass. The circuit

limits the current to the continuous current value, which corresponds to the position of

the potentiometer P5, when the output voltage of the low pass reaches the voltage,

adjusted at this potentiometer. Furthermore, the maximum possible nominal current

can be adjusted to 0...15A, 0...25A or 0...18A with an externally fed voltage of 0...10V

at the input Iext.

The maximum pulse current, deliverable by the device can be adjusted with the

potentiometer P2 of the internal current limiting. This current limiting is connected on

load side of the previously mentioned current limitations - this guarantees that the

current adjusted here, can never by exceeded.

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MTS Systems Series TBF-R User Manual Page 12