Restore Synchronism Of Following Spindle - Siemens SINUMERIK 840D sl Function Manual

Extended functions

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By resynchronizing via the NC/PLC interface signal:

DB31, ... DBX31.4 = 0 → 1 (resynchronization)

If the programmed offset is restored (see Section "Restore synchronism of following spindle

(Page 777)").

Block search when synchronous operation is active

When synchronous operation is active for a block search, then it is recommended that only

block search type 5, "Block search via program test" (SERUPRO), is used.

Restore synchronism of following spindle

Causes for a positional offset

When the coupling is reactivated after the drive enable signals have been canceled, a

positional offset can occur between the leading and following spindles if follow-up mode is

activated. A positional offset can be caused by:

● A part has been clamped or both spindles have been turned manually (machine area is

open, drives are disconnected from supply).

● After the spindle enable signals are canceled, the two spindles coast to standstill at different

speeds if they are not mechanically coupled.

● A drive alarm occurs (internal follow-up mode):

DB31, ... DBX61.3 (follow-up mode active) = 1

When the alarm is cleared, the NC must not trigger any synchronization motion.

● A synchronization was not executed due to a synchronization lock of the following spindle:

DB31, ... DBX29.5 (Disable synchronization)

Basic procedure

If the following and leading spindles have fallen out of synchronism, or failed to synchronize

at all, synchronism can be restored between them by the following measures:

1. Set the axis enable signals and cancel synchronization disable signal if this has been set.

2. Start following spindle resynchronization with the NC/PLC interface signal:

DB31, ... DBX31.4 (resynchronization)

Only after the resynchronization process is complete can the setpoint-end synchronism be

fully restored.

3. Wait until the coupled spindles have synchronized.

Extended Functions

Function Manual, 10/2015, 6FC5397-1BP40-5BA3

S3: Synchronous spindle

14.4 Points to note

Sinumerik 828d