HEIDENHAIN MANUALPLUS 620 - Page 920

920 HEIDENHAIN Technical Manual MANUALplus 620
MP_compRefAcc
For the acceleration given here, the area below to
compensation curve is set equal to the value entered in
MP_compStrength.
Available from NCK software version: 597 110-01.
Format: Numerical value
Input: –999 999 999.999 999 999 to +999 999 999.999 999 999
[m/s
2
]
Default: 0.03
Access: LEVEL3
Reaction: RUN
Limiting the
compensation
Parameter MP_compLimitFactor (400114) is used to limit reversal-spike
compensation. As a precaution, the effective internal software limit is 3 mm/
s. You can use MP_compLimitFactor to raise or lower the limit. To do this,
add the optional parameter to the machine configuration.
MP_compLimitFactor
Limit of reversal-spike compensation
Available from NCK software version: 597 110-03.
Format: Numerical value
Input: 0.5 to 5 with up to 9 decimal places
Factor for raising or lowering the internal default software limit
of 3 mm/s.
Default: No value, parameter optional
Access: LEVEL3
Reaction: RUN
Compensation of
reversal peaks
For adjusting the compensation of the reversal peaks, proceed as follows:
 Set machine parameters MP_compFFAdjust = 0 and MP_compRefAcc =
0 to ensure that the compensation strength is constant over all feed-rate
values.
Now select a typical machining speed and adjust the MP_compStrength,
MP_compWidth and MP_compTimeOffset parameters for the selected
speed.
MP_compWidth specifies the duration of compensation and should contain
values in the range of a few microns.
 In MP_compStrength specify the distance (in [mm]) which the axis will
travel if it ideally complies with the transferred nominal speed value. The
reversal peak height resulting without compensation is a suitable starting
value for the compensation.
 In MP_compWidth, enter the duration of compensation. The value entered
should lie in the range of a few microns.
 Set the parameter MP_compTimeOffset = 0.
 Run a circular interpolation test.
 If the path traversed in the circular test deviates at the reversal point from
the nominal path, first toward the inside and then toward the outside, the
compensation is performed too early. In this case, you must increase the
value in MP_compTimeOffset.