Siemens SINUMERIK 840C Installation Instructions Manual page 320

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Spindle-specific sources for retraction.

Bit 2 Bit 2=1 A retraction movement is triggered if the generator speed of an axis/spindle

Bit 1 Bit 1=1 A retraction movement is triggered if the DC link undervoltage of an

Bit 0 Bit 0=1 A retraction movement is triggered if the retraction threshold of an FA is

Time-optimized tooth pitch synchronization can be set via bit 4. This means that the

synchronized position is approached by deceleration when the following spindle speed is

above half the maximum speed. Below this speed the synchronous position is approached

along the shortest path.

Bit 4 Bit 4=1 The synchronization path of following axes is limited to 1 revolution/denomina-

As from SW 4

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falls below the minimum.

Bit 2=0 A retraction movement is not triggered if the generator speed of an

axis/spindle falls below the minimum.

Bit 1=0 A retraction movement is not triggered if the DC link undervoltage of an

axis/spindle falls below the minimum.

Bit 0=0 A retraction movement is not triggered if the retraction threshold of an FA is

This bit is only active when MD 526*, bit 7,"Synchronization of tooth pitch" is also

Gear wheels must not be in motion when this function is active.

tor of the GI link ratio to the leading spindle. Above half the maximum speed,

the synchronous position is reached by deceleration, below half the maximum

speed along the shortest path.

Bit 4=0 The synchronization path of following axes is limited to 1 revolution/denomina-

tor of the GI link ratio of the leading spindle. The synchronization position is

then always approached along the shortest path.

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6 NC Machine Data (NC MD), NC Setting Data (NC SD)

6.6.2 Spindle-specific MD bits (spindle bits)

6FC5197- AA50

link voltage

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