Electrical installation
Control terminals
Safe torque off
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EDBCSXA064 EN 3.2
5.3.3.2 Functional description
The "safe torque off" state can be initiated any time via the input terminals X6/SI1
(controller enable/inhibit) and X6/SI2 (pulse enable/inhibit). For this purpose a LOW level
has to be applied at both terminals:
ƒ X6/SI1 = LOW (controller inhibited):
The inverter is inhibited via the microcontroller system.
ƒ X6/SI2 = LOW (pulses inhibited):
The supply voltage for the optocouplers of the power section driver is switched off,
i. e. the inverter can no longer be enabled and controlled via the microcontroller
system.
The input signal at X6/SI2 to the hardware is additionally directed to the
microcontroller system and is evaluated for the state control there. For the external
further processing a HIGH level is output for the state "safe torque off active" at the
digital output X6/SO.
The control of the inverter thus is prevented by two different methods that are
independent of each other. Therefore an unexpected start−up by the motor is avoided.
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