July 2013 6.12 Spindle 985
6.12.11 Operating a second spindle
With the iTNC 530 you can operate two spindles alternately, i.e., only one
spindle can be active at a given time.
Both spindles can be operated as analog (over CMA-H) or digital spindles. If
one spindle is to be operated as a digital spindle and the other one as an analog
spindle, the first spindle must be operated as a digital spindle.
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 for axes" on
page 614.
Switching between
the spindles
You can switch between the two spindles through the PLC:
Enter MP4020 bit 5 = 1 to activate double spindle operation.
With Module 9175, switch between spindle 1 and spindle 2.
Module 9179 is used to determine the active spindle.
Commissioning the
second spindle
Digital second spindle: In MP10, deactivate one axis.
Digital second spindle: Set MP110.x, MP112.x and MP120.x of the
deactivated axis to zero.
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. “Spindle" on page 944.
Current and speed controller: For commissioning, use the machine
parameters MP2040.x to MP2912.x. Determine the x index to be used for
the second spindle with MP131.1 (for operating mode 0) and with MP132.1
(for operating mode 1).
MP4020 PLC functions
Format: %xxxxxxxxxxxxxx
Input: Bit 5 – Single- or double-spindle operation
0: Single-spindle operation
1: Double-spindle operation
MP13010 bis MP13520Machine parameter block for the second spindle
Input: Function and input range are identical to MP3010 to MP3520
If the speed encoder (with active reference mark monitoring, MP2220 bit
0) 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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