HEIDENHAIN iTNC 530 Service Manual page 56

Flowchart
Step
1
2
3
4
5
6
7
8
9
Possible
errors
Possible
causes of error
Service diagnosis See "Examination of the Output Control-is-ready (X41/pin34) and Input Control-is-ready signal
acknowledgement I3 (X42/pin 4)" on page 19 – 314.
9 – 56
Function
Waiting for machine control voltage
Recognition of the machine control voltage on
X42/4 and switch-off of the control-is-ready signal
on X41/34 by host computer (t < 66 ms).
Max. time in which the control-is-ready
acknowledgement on X42/4 must go to 0 (t < 1 s)
Recognition of the acknowledgment and setting
of X41/34 (t < 20 ms)
Waiting for machine control voltage
Normal control operation. Control-is-ready output
and acknowledgment are high.
Control voltage is switched off externally.
After switching on again, the machine control
voltage can be switched off, and then the control
operates normally.
After detecting a fault, the control switches off the
control-is-ready output (X41/34).
The message Relay external DC voltage missing does not disappear although the key
Control voltage ON is pressed.
When the key Control voltage ON is pressed, the error message EMERGENCY STOP
defective is displayed.
EMERGENCY STOP chain interrupted
24 V power supply from connector X 349 is missing
MC defective
Wiring defective, contactors defective or too slow
Screen display
RELAY EXTERNAL DC VOLTAGE
MISSING
If exceeded, EMERGENCY STOP
defective
RELAY EXTERNAL DC VOLTAGE
MISSING
EMERGENCY STOP
Error message
HEIDENHAIN Service Manual iTNC 530