Speed Setpoint Output - Siemens SINUMERIK 840D Function Manual

Mc axes and spindles

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In this case, the following applies to axes/spindles in positioning mode:

● A non-abrupt gear change is only possible at zero speed.

To do this, the tool-side position before and after a gear change are set equal for a change

in the ratio, since the mechanical position does not (or hardly) change during a gear stage

Recommendation:

To avoid 21612 "Controller enable reset during motion", changeover should be carried out

"only at zero speed". It is still permissible and expedient to switch the axis or spindle to

speed-control or follow-up mode before or during a gear change.

Boundary conditions

If the encoder to be used for position control is connected directly at the tool, the gear stage

change only affects the physical quantities at the speed interface between the NC and the drive

of the motor/load gear. The internal parameter sets are not changed.

Reference point and machine reference

Loss of machine reference

The control cannot detect all situations that can lead to loss of the machine reference.

Therefore, it is the general responsibility of the commissioning engineer or user to initiate

explicit referencing of zero marker synchronization in such cases.

In the case of gear changes, it is not possible to make a statement about the effect of the

reference point or machine position reference on the encoder scaling. In such cases, the

control partially cancels the status "Axis referenced/synchronized".

If the machine reference has been lost, it must first be restored through an adjustment or

referencing of the lost machine reference.

Speed setpoint output

Control direction and travel direction of the feed axes

You must determine the travel direction of the feed axis before starting work.

Control direction

Before the position control is started up, the speed controller and current controller of the drive

must be started up and optimized.

Traversing direction

Axes and spindles

Function Manual, 06/2019, A5E47437747B AA

G2: Velocities, setpoint / actual value systems, closed-loop control

2.4 Setpoint/actual-value system

Sinumerik 840d sl