HEIDENHAIN iTNC 530 HSCI Service Manual page 234

for the axis to be traversed / the spindle to be rotated.
(A non-HEIDENHAIN inverter is probably also equipped with a corresponding LED or display.)
If the READY LEDs are not lit, continue as follows:
February 2012
Check if the green READY LED lights up on, e.g.
the UEC 11x controller unit
the compact inverter
the UM power module (inverter module)
HEIDENHAIN expansion board for the SIMODRIVE system
Figure: READY LEDs on a two-axis module
Note
The UEC 11x compact controller units feature LEDs that can change color from red to green.
Note
As long as the axis or the spindle are operating, the red LEDs SH 1 / STO A and SH 2 / STO B
must not be lit!
Check the power supply of the inverter system.
Check the electrical cabinet (relays, wiring, etc.).
Check the ribbon cables and the plug-type connectors at the inverter system.
Note
Use the circuit diagram of the machine tool for this purpose.
Further inspection routines --> See Service Manual for Inverter Systems and Motors.
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