HEIDENHAIN ERN 420 TTL Montageanleitung Seite 6

Warnings
Fault detection signal:
Temperature at thermal switch > 100°C (± 5 K)
 UaS = Low *
a)
 Output signals remain available
LED failure or contamination of the graduated disk
b)
 UaS = Low (min. 20 ms)
 Output signals at high impedance **
c)
Attention: A temperature at the thermo switch of > 110° C (± 5 K) switches off the supply voltage.**
* The fault-detection signal is not reset until after the rotary encoder has cooled.
** Operation with position feedback is then no longer possible.
6
U
aS
TTL
/
U
U = High:
aS
aS
HTL
Overloaded driver
 UaS = Low
 Output signals at high impedance **
LED failure or U < 8 V
P
 UaS = Low
 Output signals remain available
= Low:
1 V
PP
/
/