HEIDENHAIN ITNC 530 - (EMERGENCY STOP Chain)

July 2010 16 – 233
16.2.1 Checking the "Control is ready" output and input (EMERGENCY STOP chain)
Fault:
Message
"Relay external DC
voltage missing"
permanently
displayed
If the message Relay external DC voltage missing does not disappear after pressing the key
CONTROL ON, carry out the folllowing fault diagnosis:
No
Yes
EMERGENCY STOP chain
(EMERG. STOP button, axis limit
switches, etc.) interrupted?
Switch control on as far as possible.
+ 24 V present at input
Acknowledgment: Control is Ready
(X42/PIN4)?
Yes
No
Remove the interruption.
There is still an interruption which
needs to be removed. (Use the circuit
diagram of the machine.)
Acknowledgment present
(green indicator or
I3 = 1)?
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.)
No
Yes
The PLC does not detect the
high level. Probably the input I3
on the MC is defective.
-> Replace the MC!
The control records the
acknowledgment. The message
Relay external DC voltage missing
should disappear. If it does not,
please call HEIDENHAIN!
Yes
No
Find the reason and correct the error.
(Make use of the circuit diagram of the machine.)
+24 V present at output
Control is Ready
(X41/PIN34)?
Supply voltage present for
output Control is Ready (connector
X34/PIN1 = 24V, PIN2 = 0V)?
Yes
No
The Control is Ready output of the
MC is probably defective.
-> Replace the MC!
“Control is Ready“ check