July 2010 5 – 57
The machine is in the mode 
Cross over reference 
points which is neither 
possible with the NC START 
key nor with the axis 
direction keys.
 Inverter system is not 
ready for operation.
 Check whether the 
inverter system is ready.
 See “Checking the 
readiness of the inverter 
system” on page 16 – 
243.
During reference run, the 
machine moves to the limit 
switch.
 The trip dogs for direction 
reversal during reference 
run are defective.
 Check the motor load.  See “Reference Run” on 
page 19 – 317.
During reference run, the 
machine moves to the 
mechanical stop (for 
machines without limit 
switch).
An error message is 
sometimes displayed, e.g. 
8640 I2T value of motor is 
too high ... 
 The machine was 
switched off at the wrong 
position.
  Referencing with axis-
direction keys (no 
automatic reference mark 
traverse)!
 See “Reference Run” on 
page 19 – 317. 
The machine executes the 
reference run properly but 
stops at a wrong position. 
 A wrong reference mark 
was evaluated.
 When executing a 
reference run via the 
motor encoder, the 
switching signal is too 
close to the requested 
reference mark.
 A magnet of scale is 
shifted or defective.
 The ref. mark selector 
plate of a scale is shifted.
 The enamel over a ref. 
mark of a scale was 
removed or is damaged.
 Readjust the trip dog for 
reference end position.
 Readjust the magnet 
(outside or inside the scale 
housing) and fix it with 
distance holders.
 Readjust ref. mark 
selector inside the scale 
housing with special 
slider.
 Lacquer the ref. mark not 
to be evaluated again or 
replace the scale.
 See “Readjusting the trip 
dog for reference end 
position” on page 18 – 
305.
STIB ("Control-in-operation = 
"*" in status display) remains 
in place even though 
positioning appears to be 
completed.
In the automatic operating 
modes the next NC block is 
not executed; the NC 
program gets caught up.
 Axis did not reach the 
positioning window.
 Excessive drift of analog 
axes
 Approach behavior of axis 
not optimized.
 Perform drift adjustment 
 Re
optimization o
r new 
optimization of the axis by 
the machine manufacturer
 See “Interface to the 
Drives” on page 20 – 323.
"Vibrating" axes, sometimes 
connected with loud noises
 Poor shielding or 
grounding
 Connectors on grounding 
terminal X131 of infeed/
regenerative module 
(Simodrive 611D) not 
properly wired
 Grounding terminal X131 
of power supply module 
(Simodrive 611D) or 
grounding connection 
damaged
 Check the grounding of 
your machine; consult 
your machine 
manufacturer.
 Ensure that all grounding 
clamps are secure.
 Check the shielding or the 
covers.
 See “Notes and Tips” on 
page 6 – 72.
 See “Exchange of 
HEIDENHAIN 
Components in the 
SIMODRIVE System” on 
page 28 – 554.
The following error is too 
high at axis standstill.
 Electrical offset of analog 
axes
 Carry out offset 
adjustment.
 See “Adjusting the 
electrical offset (drift 
adjustment)” on page 20 – 
349.
Error Possible cause of error Measures for error 
diagnosis and/or 
corrective action
Descriptions in this
manual