HEIDENHAIN iTNC 530 Service Manual page 317

Error message If the error message "Emergency Stop Defective" appears when the machine is switched on,
EMERGENCY STOP carry out the error diagnosis as follows:
DEFECTIVE
May 2006
Error message EMERGENCY STOP Defective
The machine is switched on.
Is the input I3
(X42/PIN4) permanently
on high level?
Switch the main switch of the machine off.
Disconnect and secure the original wires.
Insert a bridge between X41/PIN34 and X42/PIN4
(output and input of Control is Ready).
Observe that the potential of the power supply is the
same -> See „"Caution" box below this chart.
Switch the main switch of the machine on.
Does the error message
EMERGENCY STOP Defective
reappear?
The fall time of the relay triggered by the output X41/
PIN34 is probably too long.
-> Replace the relay.
Caution
If 24 V is supplied to the control-is-ready output from the HEIDENHAIN inverter system via
connector X34, potential differences between the 24 V machine voltage and the 24 V from
the inverter can result in compensating currents.
Therefore it is perferable to supply X34 with machine voltage before you insert a bridge
between the "Control-is-ready" input and output during the following investigation!
Yes
No
Yes
No
Find the reason and correct
the error. (Make use of
the circuit diagram
of the machine.)
The MC is probably
defective.
-> Replace the MC.
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