Gear Shifting - HEIDENHAIN TNC 426 PB/M Technical Manual

Table of Contents

Gear shifting

You control the gear shifting through PLC outputs. The NC enters the current

gear range according to the programmed speed in W256. The gear range is

calculated with MP3510.x. The output of the gear range is defined in MP3010.

MP3030 bit 1 determines if the speed should be reduced to 0 when shifting

between gears.

When the gear range is changed, the NC uses the G strobe (M4070). As soon

as you confirm the gear shift with M4090, the program resumes and the

G strobe (M4070) is reset by the NC.

If a TOOL CALL block is followed by the output of a T strobe and G strobe,

then M4547 is set by the output of the T strobe and reset by output of the

G strobe. If there is no output of either the T or G strobe, M4547 is not set.

In the PLC program you can change the programmed speed and the gear

range that is calculated by the NC. This may be necessary, for example, for

horizontal/vertical spindles. The programmed speed is saved by the NC in

D356 and D756:

Enter a speed in D756 and a gear range in W256. The speed must lie within

the speed range of the gear.

With M4134, activate your entries in D756 and W256.

After the NC has reset M4134, change the gear and report with M4090 that

the gear shift has been completed.

A changing nominal speed value can be output to shift gears by alternately

setting and resetting M4009 and M4010. This can be realized by interrogating

the timers in the PLC program. This function also works if you have used

M4008 to disable the speed output for the spindle:

In MP3240.2, define the nominal speed value that is output with M4009/

M4010 to the spindle motor.

Behavior of the spindle

Bit 1– Zero spindle speed when shifting to another gear range

0: Reduce speed to 0

1: Do not reduce speed to 0

Analog spindle: Spindle jog voltage for gear shifting

(M4009/M4010)

0 to 9.999 [V]

Digital spindle: Motor speed for gear shifting (M4009/

0 to 9.999 [1000 rpm]

HEIDENHAIN Technical Manual TNC 426, TNC 430