HEIDENHAIN iTNC 530 Service Manual page 324

If the READY LEDs are not lit, proceed as follows:
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Red LED SH1 The SH1 signal (safe stop 1) indicated by a red LED at the inverter, is generated by the computer
of the iTNC. The signal is low-active, i.e. line-break proof.
If the computer is not ready for operation or if an error is pending, SH1 is output. The red SH1
LED and the green READY LED at the inverter can never be lit a the same time. They are
mutually locked.
Red LED SH2 The SH2 signal (safe stop 2) indicated by a red LED at the inverter, is generated by the controller
of the iTNC. The signal is low-active, i.e. line-break proof.
If an axis or spindle is not controlled, SH2 is pending and the red LED is on.
This is for example the case with clamped axes or if a spindle is not controlled.
SH2 and READY are on simultaneously.
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Check the 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!
Note
HEIDENHAIN interface cards for the SIMODRIVE system:
The cards for the plug-type connectors (ribbon cables) are equipped with the green READY
LED and the red LEDs SH1 and SH2.
The cards with D-Sub connectors are equipped with the green READY LED and the red
LEDs RESET X1 und RESET X2 for the respective axis.
RESET X1, RESET X2 correspond to the SH2 signal.
The first generation of the cards with D-Sub connectors feature a green IF LED and a red
NB LED.
IF stands for "pulse enable" (German: Impulsfreigabe) and means that the axis module is
ready.
NB means that the axis module is "not ready" (nicht bereit).
For further information on the drives please refer to the service manual "Inverter Systems
and Motors".
HEIDENHAIN Service Manual iTNC 530