HEIDENHAIN TNC 150 B Mounting Instructions page 19

The emergency stop contact can be governed' by two monoflops:
.Monoflop for the position loop calculator
.Monoflop for the main calculator
Both directions of the emergency stop circuit are checked when the control is switched on (see
flow-chart).
Procedure for emergency stop supervision
Power on
Fault display
RELAY EXT-DC VOLTAGE MISSING
I
t
Switch on control voltage
I
Control opens Emergency Stop-contact via
monoflop of position loop calculator
Fault display
EMERGENCY STOP DEFECTIVE
24 Volts on J5/8 or J4/4
Switch off mains power
Fault display
RELAY EXT-DC VOLTAGE MISSING
4
Rectify fault Switch on control voltage
t
Control opens Emergency Stop-contact
via monoflop of main calculator
Fault display
EMERGENCY STOP DEFECTIVE
I
t
Rectify fau It
t
Switch on control voltage
Machine operational
19