20 – 336 HEIDENHAIN Service Manual iTNC 530
20.1.6 Troubleshooting: Interchanging PWM outputs on the CC 424 (B)
To find out whether the connected drive system or the PWM interface on the CC is defective,
the interchange method can be used.
Use the interface of a working axis for this purpose.
Modular setup with
CC 424 (B)
Example Error in X-axis
Example machine
parameters
Notes and
preliminary
action
îš„ Switch the PWM output with that of a functioning axis.
(Depending on the configuration of single-speed and double-speed control loops, unassigned
PWM outputs may not be active.)
îš„ Single-speed and double-speed PWM outputs with equal PWM frequency can be
interchanged for test purposes.
îš„ The outputs can only be switched within the main DCB and the auxiliary DCB.
îš„ The firmly assigned motor encoder input must also be interchanged!
îš„ The same PWM frequency must be set for the axes to be switched!
îš„ Axes in master-slave torque control are only permitted on X51/X53 or X52/X54.
When using a CC 424 (B) with 8 and 14 control loops starting with NC software 34049x-03,
master-slave torque axes also function on X55/X57 or X56/X58.
Before you connect drives to other interfaces for error localization:
Make sure that there are no ground faults or short circuits in the drive components
(inverters, motors, etc.) --> See service manual "Inverter Systems and Motors".
MP 100.x = - - - - -CZYX (X = 1st axis, Y = 2nd axis, Z = 3rd axis, C = 4th axis)
MP 2180.x = 0 (PWM frequency = 5 kHz for all axes)
MP 120.0 = 51 (X axis on PWM output X51)
MP 120.1 = 52 (Y axis on PWM output X52)
MP 120.2 = 53 (Z axis on PWM output X53)
MP 120.3 = 54 (C axis on PWM output X54)
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