3 – 662 HEIDENHAIN Service Manual iTNC 530
Time diagram
X41/34 = Control is ready output = O33
X42/4 = Control-is-ready signal acknowledgement = I3
Possible
errors and error
messages
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.
Possible
causes of error
EMERGENCY STOP chain interrupted
24 V power supply from connector X 34 is missing
MC defective
Wiring defective, contactors defective or too slow
Troubleshooting See “Checking the "Control is ready" output and input (EMERGENCY STOP chain)” on page 16
– 233.
Step Function Screen display
1 Waiting for machine control voltage RELAY EXTERNAL DC VOLTAGE MISSING
2 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)
3 Maximum time within which the control-is-
ready acknowledgment on X42/4 must go to
zero (t < 1 s)
If exceeded, EMERGENCY STOP
defective
4 Recognition of the acknowledgment and
setting of X41/34 (t < 20 ms)
5 Waiting for machine control voltage RELAY EXTERNAL DC VOLTAGE MISSING
6 Normal operation of control. Control-is-ready
output and acknowledgment are high.
7 Control voltage is switched off externally. EXTERNAL EMERGENCY STOP
8 After switching on again, the machine control
voltage can be switched off, and then the
control operates normally.
9 After detecting a fault, the control switches
off the control-is-ready output (X41/34).
Error message
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