20 – 324 HEIDENHAIN Service Manual iTNC 530 HSCI
20.2 Traversing the reference marks
If no EnDat encoders are used, the reference marks need to be retraversed after every power
interruption.
After the reference marks have been traversed:
The software limit switches are activated.
The most recently saved datum and machine datum are reproduced.
PLC positioning and positioning with M91 and M92 become possible.
For axes in an open loop, the counter is set to the value in the machine parameter MP960.x.
20.3 Error messages
Error messages related to the encoders may also have an effect on reference mark traverse.
--> See ”Error messages” on page 19 – 280.
--> See ”Error messages” on page 19 – 303.
Moreover, the following error messages may be generated during reference mark traverse:
8BA0 Incorrect reference signal or line count %.2s
8BE0 Encoder defective <axis>
8CA0 Incorrect reference signal or line count %.2s
Double referencing is active
Incorrect reference position <axis>
C3A0 Incorrect ref. position %.2s
Ref mark <axis>: incorrect spacing
Set MP1356.%d to %.4f
Reference the spindle!
3DROT active: use axis buttons
20.4 Possible error causes
Here, the same causes of error apply as for the encoders.
--> See “Possible error causes” on page 19 – 281.
--> See “Possible error causes” on page 19 – 303.
Especially for referencing, causes of error may be:
Defective trip dog
(The reference end position is not detected.)
The trigger signal of the trip dog is too close to the reference pulse.
(During reference run via the motor encoder --> the reference mark signal is not detected
at the correct position, but one motor revolution too early or too late.)
With old position encoders:
Magnet inside or outside scale housing shifted or defective
(A wrong or no reference mark is evaluated.)
Ref. mark selector plate displaced
(inside the scale housing, where there is the ref. mark label on the outside the scale housing)
Enamel wiped off or damaged
(On some scales the ref. marks were deactivated with enamel; if it is removed by using unsuitable
cleaning agents and equipment, these marks are "reactivated".)
Ask the machine operator about the referencing procedure at the machine concerned.
Respective information should also be included in the machine manual.
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