Maintenance And Troubleshooting; Maintenance - WEG CFW900 Serie Manual De Seguridad

Maintenance and Troubleshooting

5 MAINTENANCE AND TROUBLESHOOTING

5.1 MAINTENANCE

The CFW900 frequency inverter is equipped with several self-diagnosis functions and HMI
messages to help the user identify problems with the product or its installation.
The STO90 safety functions board, in particular, contains a very accurate self-diagnosis circuit,
which guarantees high levels of safety integrity even under fault conditions. Faults related to safety,
which are reported as F160 and F161, include misconnections of the safety signals, errors in the
configuration of the STO90 and damages in the internal circuits. See
FAULTS RELATED TO STO90 on page 25
If fault F160 or F161 is shown on the HMI display and no external cause can be identified, then
it is possible that there is an internal problem in the STO90. In this case, CFW900 must be
submitted to an authorized service center. Contact your local WEG supplier to get information
on how to proceed.
NOTE!
Never try to fix or allow a non-authorized person to fix any WEG products. The
safety assurance is automatically lost if any product violation occurs.
NOTE!
There are no spare parts for the STO90. In case of damage, contact your local
WEG supplier. Only an authorized service center may repair damaged products.
NOTE!
The functional safety circuits of the CFW900 were designed in such a way that
no maintenance or regular tests are necessary. The circuits check themselves
at periodic intervals informing the user if any problem is detected.
NOTE!
When the STO90 detects a fault condition and the SS1-t safety function is
selected, CFW900 attempts to execute the deceleration of the motor (SS1-t
state) before the actuation of fault F160, similarly to what occurs when the SS1-t
safety function is normally activated by the safety inputs.
NOTE!
Fault F160 also means a safe torque-off state.
NOTE!
In case of maintenance, the overall safety of the machine or system must be
reassessed to verify its integrity. Furthermore, in case of modifications, the
validation of the safety function must be repeated and documented.
24 | CFW900
for the most common causes for faults F160 and F161.
Section 5.2 STATES AND