Siemens SINUMERIK 840D sl Function Manual page 308
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2.4 Drive service display (for digital drives only)
ZK1 Messages
Display indicates whether messages of status class 1 are active.
State 0: There is no pending ZK1 message.
State 1: One or several status class 1 messages are active.
Status class 1 messages are alarms with the following characteristics:
• They lead to internal responses (e.g. regenerative braking, immediate pulse suppression)
• They are modal.
DC link voltage
indicates the current DC link voltage level within the drive grouping.
Unit: Volts
Speed setpoint
The displayed speed setpoint represents the unfiltered total setpoint value. It consists of the
position controller output component and the speed feedforward branch.
Unit: rpm
Display corresponds to machine data:
MD1706 $MD_DESIRED_SPEED (speed setpoint value).
Speed actual value
The displayed real value represents the unfiltered actual speed value.
Unit: rpm
Display corresponds to machine data:
MD1707 $MD_ACTUAL_SPEED (actual speed value).
Smoothed actual current value
Display of the smoothed actual current value. The torque-generating actual current value is
smoothed by a PT1 element with parameterizable time constants.
Unit: %
100 % corresponds to the maximum current of the power section.
Display corresponds to machine data:
MD1708 $MD_ACTUAL_CURRENT (smoothed actual current value).
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Basic logic functions: Diagnostic tools (D1)
Function Manual, 11/2006, 6FC5397-0BP10-2BA0
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