7
DIAGNOSTICS AND TROUBLESHOOTING
7.3.2 Preventive Maintenance with Complete Stop/De-energization
DANGER!
This equipment has high voltages that may cause electric shocks. Only people with properly
qualified and familiar with the MVW3000 Inverter and associated equipment must plan or service
this equipment. In order to avoid the risk of shock, follow all the safety procedures required for
servicing energized equipment.
Do not touch any electrical circuit before ensuring it is de-energized.
This type of maintenance is also intended for the cleaning and visual inspection of the high voltage cabinets;
therefore, it requires the complete de-energization of the inverter. It can be less frequent than the preventive
maintenance during operation.
Procedures:
1. Execute the procedures 1 and 4 of the Preventive Maintenance During Operation.
DANGER!
Although the inverter commands the opening of the input switchgear, there is no guarantee of its
opening and neither that no voltages are present, because the capacitors remain charged for a long
time, and they can also be charged through the auxiliary low voltage supply. Before opening and
accessing the high voltage cabinets, follow all the safe de-energization procedures described next.
7.4 SAFE DE-ENERGIZATION INSTRUCTIONS
1. Decelerate the motor to a complete stop.
2. Check the DC link voltage values of the installed power cells at parameters P1000 to P1035 da HMI.
3. Press the “POWER OFF” pushbutton. The input transformer switchgear should open at this moment, which is
indicated by the “INPUT ON” pilot light going off.
WARNING!
If the input transformer switchgear does not open with the “POWER OFF” command, then open it
manually.
4. Follow the DC link voltage decrease through the respective parameters on the HMI. Even with the zero volt
indication, you must wait for ten minutes so as to ensure the full discharge of the DC link capacitors.
5. Press the emergency pushbutton located on the control column door and remove its key.
6. On the circuit breaker cabinet (switchgear) of the input transformer, switch off the switch disconnector and
grounding of the inverter circuit. It is necessary to confirm visually the opening of the switch through the inspection
window. Lock the cabinet and/or add warning sign indicating “System in maintenance”.
7. Switch off the Q2 circuit breaker in the control column and lock it in the open position with a padlock and/or
put a warning sign indicating “System in maintenance”.
8. Switch off the Q1 circuit breaker in the control column. Remove the auxiliary power supply.
It is only after the sequence of procedures described above that high voltage compartment doors can be opened.
MVW3000 | 7-68
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