December 2001 Spindle 6 – 215
6.12.14 Operating a Second Spindle
With the TNC you can operate two spindles alternately, i.e., only one spindle
can be active at a given time. The TNC provides digital and analog speed
command signals for both spindles.
The following combinations of speed command signals are available for the
two spindles:
Assignment of
encoder input and
speed command
output
The second spindle is driven instead of an axis, i.e., there are fewer axes
available. An exception is analog operation of the second spindle without a
position encoder. In this case all axes remain available. The assignment of
position and speed encoder inputs as well as of speed command outputs is
entered in MP111.x, MP113.x and MP121.x
(See "Assignment” on page 6 – 15).
Switching between
the spindles
You can switch between the two spindles through the PLC:
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7 Enter MP4020 bit 5 = 1 to activate double spindle operation.
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7 With Module 9175, switch between spindle 1 and spindle 2.
Commissioning the
second spindle
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7 Digital second spindle: In MP10, deactivate one axis.
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7 Digital second spindle: Set MP110.x, MP112.x and MP120.x of the
deactivated axis to zero.
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7 Machine parameters MP13010 to MP13520 are available for the second
spindle. In their functions and input ranges, these parameters are identical
with MP3010 to MP3520 for the first spindle.
(See "Spindle” on page 6 – 180)
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7 Current and speed controller: For commissioning, use the machine
parameters MP2020.x to MP2930.x. The index x depends on the PWM
output in use; see also the following table.
Operation of the first spindle Operation of the second
spindle
Digital
(TNC without integral spindle DSP)
Analog
Digital
(TNC with integral spindle DSP)
Digital or analog
Analog
(TNC with and w/o integral spindle DSP)
Analog
Note
If the speed encoder (with active reference mark monitoring, MP2221 bit
0) of a spindle with integral spindle DSP is disconnected and reconnected,
the reference mark must be reevaluated (M4015) after the drive has been
switched on again, otherwise the error message Incorrect reference
position appears.
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