6 – 190 HEIDENHAIN Technical Manual TNC 426, TNC 430
Spindle override You can change the spindle speed within certain limits with the spindle
override potentiometer.
7
77
7 Define the limits in MP3310.x.
7
77
7 In MP3515.x, enter for every gear range a maximum attainable speed which
must not be exceeded with the spindle override.
The percentage adjusted with the spindle override is entered by the NC in
W492 and W764. You can change the percentage through the PLC:
7
77
7 Enter the desired percentage in W764.
As soon as a new value is entered here, it is assumed by the NC.
The spindle override functions either in 1% steps or according to a nonlinear
characteristic curve:
7
77
7 With MP7620, bit 3, select the mode of the override.
Value range in W492 and W764:
n 1% steps: 1 to 150
n
Nonlinear characteristic curve: In the lowest range, 0.01% steps are available.
Beginning with a value of 2.5%, the step is 0.75%
Example: Two gear ranges for an analog spindle:
n Gear range I: 1500 rpm at 6 V (MP3210.0 = 6; MP3510.0 = 1500)
n Gear range II: 3000 rpm at 8 V (MP3210.1 = 8; MP3510.1 = 3000)
n Upper limit for spindle override : 125% (MP3310.0 = 125)
n Lower limit for spindle override: 50% (MP3310.1 = 50)
n Maximum possible output speed for gear range II: 3375 rpm
(MP3515.1 = 3375)
n Minimum nominal value voltage: 1 V (MP3240.1 = 1)
[min
1
]
U [V]
MP3210.1
= 8 V
MP3210.0
= 6 V
MP3240.1
= 1 V
3375
MP3515.1
1875750
0 250 3000
MP3510.1
1500
MP3510.0
III
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