The emergency stop contact must cut-out the 24 V auxiliary voltage in the machine interface. Due to the
significance of the emergency stop contact for safety reasons, its function is monitored by the control with each
switch-on of power (see flow chart).
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
c
Switch on control voltage
I
YES
I
I I
FF
Control opens Emergency Stop-contact vra
monoflop of position loop calculator
/
Fault display
EMERGENCY STOP DEFECTIVE
E
Fault display
EMERGENCY STOP DEFECTIVE
I
Switch off mains power
f-ault display
RELAY EXT-DC VOLTAGE MISSING
I
I
-III
1
Rectify fault
’ r-$-h+1
21
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