(Emergency Stop Chain) - HEIDENHAIN iTNC 530 Service Manual

16.2.1 Checking the "Control is ready" output and input (EMERGENCY STOP chain)
If the message Relay external DC voltage missing does not disappear after pressing the key
Fault:
CONTROL ON, carry out the folllowing fault diagnosis:
Message
"Relay external DC
voltage missing"
permanently
displayed
July 2010
"Control is Ready" check
Switch control on as far as possible.
Check status of the Acknowledgment: Control
is Ready (-NE1) indicator in the Drive
diagnosis window (or check in the
PLC TABLE, whether I3 is set.)
Acknowledgment present
(green indicator or
I3 = 1)?
+ 24 V present at input
Acknowledgment: Control is Ready
(X42/PIN4)?
EMERGENCY STOP chain
(EMERG. STOP button, axis limit
switches, etc.) interrupted?
+24 V present at output
Control is Ready
(X41/PIN34)?
Supply voltage present for
output Control is Ready (connector
X34/PIN1 = 24V, PIN2 = 0V)?
Find the reason and correct the error.
(Make use of the circuit diagram of the machine.)
Yes
Relay external DC voltage missing
No
Yes
No
Yes
No
Yes
needs to be removed. (Use the circuit
No
Yes
The Control is Ready output of the
No
The control records the
acknowledgment. The message
should disappear. If it does not,
please call HEIDENHAIN!
The PLC does not detect the
high level. Probably the input I3
on the MC is defective.
-> Replace the MC!
Remove the interruption.
There is still an interruption which
diagram of the machine.)
MC is probably defective.
-> Replace the MC!
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