Gear Stage Change - Siemens SINUMERIK 808D Function Manual

Maximum encoder frequency exceeded
When the spindle speed reaches a speed (large S value programmed), which exceeds the maximum encoder limit
frequency MD36300 ENC_FREQ_LIMIT (the maximum mechanical speed limit of the encoder must not be exceeded), the
synchronization is lost. The spindle continues to rotate, but with reduced functionality.
If a speed is then reached that is below the encoder limit frequency in MD36302 ENC_FREQ_LIMIT_LOW (% value of
MD36300), the spindle automatically synchronizes with the next zero mark signal. You can achieve this by programming a
lower S value, changing the spindle speed override switch, etc.
Re-synchronizing
In the following case, however, the position measuring system must be re-synchronized: the position measurement encoder
is on the motor, a BERO (distance sensor for synchronization signals) is mounted to the spindle and the gear stage is
changed. The synchronization is triggered internally when the spindle is rotating in the new gear stage.
17.4

Gear stage change

Number of gear stages
Five gear stages can be configured for the spindle. If the spindle motor is mounted on the spindle directly (1:1) or with a non-
adjustable gear ratio, MD35010 GEAR_STEP_CHANGE_ENABLE (gear stage change is possible) must be set to zero.
Gear stage change with gear stage selection:
Defining a gear stage
A gear stage can be defined as follows:
● Permanent definition in the part program (M41 to M45)
● Automatic definition by the programmed spindle speed (M40)
In the case of M40, the spindle must be in the control mode for automatic gear stage selection with an S value. The gear
stage change is otherwise rejected and alarm 22000 "Gear change not possible" is output.
M41 to M45
The gear stage can be permanently defined in the part program with M41 to M45. If a gear stage is defined by M41 to M45,
which is different than the current (actual) gear stage, the IS "Change gear" (DB390x.DBX2000.3) and the IS "Set gear
stage A" to "...C" (DB390x.DBX2000.0 to .2) are set. The programmed spindle speed (S) then refers to this permanently
Function Manual
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01/2017