States And Faults Related To Sto90 - WEG CFW900 Serie Manual De Seguridad

ATTENTION!
If simultaneous faults occur on two or more IGBTs of CFW900 during the
activation of the safety function, it is possible that CFW900 delivers sufficient
energy to cause a magnetic alignment between the rotor and the internal
magnetic poles of the motor. This movement depends on the number of
poles of the motor and is limited to a maximum of 180°. Although this event is
unlikely to occur, make sure that this possibility cannot cause harm to people
or damages to machinery.

5.2 STATES AND FAULTS RELATED TO STO90

STO - SAFE TORQUE-OFF STATE
Description:
It indicates to the user that the STO state is active.
Possible Causes:
Actuation of the safety inputs (STO1 and STO2).
„
Safety input circuit not installed.
„
Safety input circuit de-energized.
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SS1-t - SS1 CONTROLLED TIMING
Description:
It indicates to the user that STO90 is executing the timing of the SS1-t safety function, while
CFW900 central control decelerates the motor.
Possible Causes:
Actuation of the safety inputs (STO1 and STO2) with the SS1-t safety function configured.
„
Fault detected with the SS1-t safety function configured.
„
CONFIG - STO90 PROGRAMMING MODE
Description:
It indicates to the user that STO90 is in the programming mode of the safety functions.
Possible Causes:
Activation of the DIP switches S2 of STO90 during the STO state.
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Maintenance and Troubleshooting
CFW900 | 25