HEIDENHAIN iTNC 530 HSCI - Page 235

17 – 236 HEIDENHAIN Service Manual iTNC 530 HSCI
Red LED
SH 1 / STO A
The old red SH 1 LED has been superseded by the red STO.A LED.
 SH 1 means "Safe Stop 1" (Sicherer Halt)
 STO A means "Safe Torque Off cutout channel A“
 SH 1 / STO A is indicated by a red LED on the inverter system
 SH 1 / STO A is generated by the processor (MC 6222, MC 6241) of the iTNC 530 HSCI
 SH 1 / STO A is low-active, i.e. line-break proof
If the processor is not ready for operation or if an error is active, SH 1 / STO A is output.
The red SH 1 / STO A LED and the green READY LED at the inverter can never be lit a the same time.
They are mutually locked.
Red LED
SH 2 / STO B
The old red SH 2 LED has been superseded by the red STO.B LED.
 SH 2 means "Safe Stop 2"
 STO B means "Safe Torque Off cutout channel B“
 SH2 / STO B is indicated by a red LED on the inverter system
 SH 2 / STO B is generated by the controller (CC 61xx or UEC 11x) of the iTNC 530 HSCI
 SH 2 / STO B is low-active, i.e. line-break proof
If an axis or spindle is not controlled, SH 2 / STO B is active and the red LED is on.
This is, for example, the case with clamped axes or if a spindle is not controlled.
SH 2 / STO B and READY are on simultaneously.
Figure: LEDs SH 1 / SH 2 and STO A / STO B on HEIDENHAIN UM units
Note
Within the framework of standardization and adaptation to the machine directives 2006/42/EC
binding as of January 1, 2010, the designation of the enabling signals SH 1 (Safe Stop 1) and SH 2
(Safe Stop 2) was changed for inverter models from the current production program.
The signal "SH 1“ was renamed to "STO A“ (Safe Torque Off - channel A) and the signal "SH 2“
to "STO B“ (Safe-Torque Off - channel B).