PA SDI-Drives Midi™ / Maxi™
Edition
07.44
Power Automation
2.3.5 Simple Connection Example using Contact Switches
In order to reach the control category of EN 954 Part 1, Part 2 category 3 and ISO 13849
performance level “d”, the signal ”SAFE LOCK” (S1 and S2) must be additionally verified.
This requires external wiring. The external wiring must be adapted to the existing safety
concepts and checked for a reliable operation.
The holding brake circuitry reaches EN 954 Part 1, Part 2 category 1 and for the electrical
circuitry ISO 13849 performance level “c”.
This circuit shows the minimum external wiring of the axis module, with switching contact
for a motor with brake.
The ENABLE and EN-BRAKE signals are switched by the same switch. In this case, the
axis cannot be moved manually. If this function is needed, an additional switch for
EN-BRAKE is needed.
The function of this circuit is: The safe restart lock is activated, when the lamp is on. In this
case, only the visual feedback is used.
X10
S1
S2
LOCK
ENABLE
11
22
55
66
B+
B+
B-
B-
X3, X4, X5
Y1
H1
24V-GND
24V
EN-BRAKE
77
SAFE
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