Siemens SINUMERIK 840C Installation Instructions Manual page 464

Siemens computer drive installation instructions

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The pulse frequency can be specified only in the quantization given in the table above. Other

frequency inputs are rounded up or down to the next closest table value, e.g. 3150 Hz to

Default value

The calculation dead time is the time which elapses between the start of a current control

clock cycle (input of current setpoint) and the activation of the control voltage setpoints on the

gating unit ASIC. The standard default value is automatically loaded during initial start-up when

machine data M1102 is input. In order to make the setpoints on all power sections "valid"

simultaneously (to achieve uniform dynamic response), the time required to calculate the most

complex axis (double axis) is entered.

Setting values (worstcase), execution times:

Limits of calculation dead time (violation leads to error message)

MD 1000 x 31.25 µs (=current controller clock cycle)

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A preselection with synchronous sampling period (TPWM) with respect to the controller cycles can be made

via the toggle button.

SINUMERIK 840C (IA)

Calc. dead time current closed-loop

Lower input limit

Upper input limit

40 µs = single-axis module

50 µs = double-axis module

6FC5197- AA50

7 Drive Machine Data (SIMODRIVE Drive MD)

7.2.2 FDD MD (data description - SW 3)

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Simodrive 611-d