S3: Synchronous spindle
13.4 Points to note
Extended Functions
Function Manual, 03/2013, 6FC5397-1BP40-3BA1
747
If, for example, VELOLIMA[S1]=50 and VELOLIMA[C]=50 are to have the same effect as
before with this machine data, the programming of FA, OVRA, ACC and VELOLIM have an
effect regardless of the programmed names:
MD30455 $MA_MISK_FUNCTION_MASK Bit 6=1
Knee-shaped acceleration characteristic
For the leading spindle, the effect of a knee-shaped acceleration characteristic on the
following spindle is identified by the following axis-specific machine data:
● MD35220 $MA_ACCEL_REDUCTION_SPEED_POINT (speed for reduced acceleration)
and
● MD35230 $MA_ACCEL_REDUCTION_FACTOR (reduced acceleration).
If MD35242 $MA_ACCEL_REDUCTION_TYPE is present, it is also used to configure the
type of acceleration reduction. Otherwise a hyperbolic drop in acceleration is assumed.
If the dynamic response of a following spindle is lower than that of the leading spindle when
the coupling factor is taken into account, the leading spindle dynamic response is reduced to
the required level while the coupling is active.
The acceleration should be constant over the entire speed range for the following spindle.
However, if a knee-shaped acceleration characteristic is also stored in the above-mentioned
machine data for the following spindle, this is only taken into account when the spindles are
coupled in. The setpoints of the following spindle are applied for the specified knee-shaped
acceleration characteristic.
References:
Function Manual, Basic Functions; Acceleration (B2),
Section: Knee-shaped acceleration characteristic
Actual value coupling
In an actual value coupling (AV), the drive for the FS must be considerably more dynamic
than the leading spindle drive. The individual drives in an actual value coupling are also set
optimally according to their dynamic response.
An actual value coupling should only be used in exceptional cases.
Speed coupling
The velocity coupling (VV) corresponds internally to a setpoint coupling (DV), but with lower
dynamic requirements of the FS and LS. A position control servo loop is not required for the
FS and/or LS. Measuring systems are not required.
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