174 Appendix: Safe Torque Off (STO)
WARNING! The STO function does not disconnect the voltage of the main and
auxiliary circuits from the drive. Therefore maintenance work on electrical parts
of the drive or the motor can only be carried out after isolating the drive system from
the main supply. If the drive was connected to the input power, wait for 5 minutes after
disconnecting the input power.
X3:18
X3:19
X3:9
X3:8
X1:U
DC+
DC-
MicroFlex e150
U+
V+
W+
U-
V-
W-
+24 V
+24 V
+0 V
Safety circuit
(emergency stop
switch, relay etc.
Motor output (U phase shown)
Integrated
Power
Module
PWM control
circuit
Safe Torque Off
connections
Drivers
High
Low
PWM power
circuit
Common
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