Siemens SINUMERIK 840D sl Function Manual page 867

● Type of coupling between FS and LS
The relevant coupling characteristics for the configured coupling are selected using machine
data, see "Configuration of a synchronous spindle pair via machine data" and for the user
defined coupling using the language instruction COUPDEF, see Section "Preparatory
programming instructions".
In addition, coupling characteristics Type of coupling and Block change response can be
altered for the permanently configured coupling by means of language instruction COUPDEF.
References:
/PGA/, Programming Manual, Advanced ("Synchronous Spindles").
Change protection for coupling characteristics
The channel-specific MD21340 $MC_COUPLE_IS_WRITE_PROT_1 is used to define
whether or not the configured coupling parameters Speed ratio, Type of coupling and Block
change response can be altered by the NC parts program:
0: Coupling parameters can be altered by the NC parts program via instruction COUPDEF
1: Coupling parameters cannot be altered by the NC parts program. Attempts to make
changes will be rejected with an alarm message.
Superimposed motion
In synchronous operation, the synchronous spindle copies the movement of the leading
spindle in accordance with the programmed speed ratio.
At the same time, the synchronous spindle can also be traversed with overlay so that the LS
and FS can operate at a specific angular position in relation to one another.
Extended Functions
Function Manual, 01/2008, 6FC5397-1BP10-3BA0
The position setpoint or the actual position value of the leading spindle can be used as
the reference value for the following spindle. The following coupling types can therefore
be selected:
– Setpoint coupling (DV)
Use in position controlled operation. The control dynamic response of both spindles
should coincide as far as possible. Preferably, the setpoint coupling should be used.
– Actual value coupling (AV)
Application if no position control of the LS is possible or with great deviation of the
control characteristics between FS and LS. The setpoints for the FS are derived from
the actual values of the LS. The quality of synchronism is worse with a varying spindle
speed than with the setpoint coupling.
– Speed coupling (VV)
Internally, the velocity coupling is a setpoint coupling. The requirements for FS and LS
are lower. Position control and measuring systems are not required for FS and LS.
The position offset between FS and LS is undefined.
Synchronous Spindles (S3)
14.1 Brief description
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