HEIDENHAIN iTNC 530 Service Manual page 662

Time diagram
X41/34
X42/4
Step
1
2
3
4
5
6
7
8
9
Possible
errors and error
messages
Possible
causes of error
See "Checking the "Control is ready" output and input (EMERGENCY STOP chain)" on page 16
Troubleshooting
– 233.
3 – 662
X41/34
X42/4
1 2 3
= Control is ready output
= Control-is-ready signal acknowledgement
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)
Maximum time within which the control-is-
ready acknowledgment on X42/4 must go to
zero (t < 1 s)
Recognition of the acknowledgment and
setting of X41/34 (t < 20 ms)
Waiting for machine control voltage
Normal operation of control. 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 34 is missing
MC defective
Wiring defective, contactors defective or too slow
4 5
Screen display
RELAY EXTERNAL DC VOLTAGE MISSING
If exceeded, EMERGENCY STOP
defective
RELAY EXTERNAL DC VOLTAGE MISSING
EXTERNAL EMERGENCY STOP
Error message
HEIDENHAIN Service Manual iTNC 530
6 7 8 9
= O33
= I3