18 – 294 HEIDENHAIN Service Manual iTNC 530
Fixed assignment of PWM output and speed encoder input of the CC 424 (B):
EnDat encoders All speed encoder inputs operate with 1 Vpp and are EnDat-compatible.
Memory areas in
the EnDat encoder
Motor encoders with EnDat interface can feature a so-called electronic ID label. It contains the
motor data, such as device name, ID number, serial number, etc.
Furthermore, the machine manufacturer has the possibility of storing machine or system-
specific data.
Temperature
sensor lines
The signal cable for the motor encoder also includes the temperature sensor lines of the
motor.
Polyfuses
Different
servicing
Assignment of the speed encoder outputs to
the drive-control boards of the CC 422
Speed encoder input
1 (main DCB) X15 - X20
2 (auxiliary DCB) X80 - X87
Drive-control board
of the CC 424 (B)
PWM output
(MP120.x/MP121.x)
Speed encoder input
1 (main DCB) X51 X15
1 (main DCB) X52 X16
1 (main DCB) X53 X17
1 (main DCB) X54 X18
1 (main DCB) X55 X19
1 (main DCB) X56 X20
2 (auxiliary DCB) X57 X80
2 (auxiliary DCB) X58 X81
2 (auxiliary DCB) X59 X82
2 (auxiliary DCB) X60 X83
2 (auxiliary DCB) X61 X84
2 (auxiliary DCB) X62 X85
2 (auxiliary DCB) X63 X86
2 (auxiliary DCB) X64 X87
On the CC 424 (B) with 8 and with 14 control loops, X57/X80 und X58/X81 are still located
on the main DCB.
Current CCs feature so-called "Polyfuses". These are electronic fuses that separate
defective peripheral devices from the low voltages in the control in the event of an error.
This is also true for the encoders!
If a defective encoder draws too much current, it is "separated" from the control component.
Corresponding error messages are displayed.
The service on the CC 422 and CC 424 (B) is different.
Ensure to use the correct instructions!
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