102 Maintenance
Maintenance overview
The unit monitors itself. If a malfunction occurs, the control unit shows the fault to the
user. You can use a remote monitoring adapter to monitor the unit.
ABB recommends that you examine the operation of the unit regularly. Refer to
Maintenance intervals on page 103.
If damage to the unit occurs, the whole unit is usually replaced. Contact your local
ABB service provider for assistance.
Fan service
The inverter has three fans that run when needed depending on the temperature
inside the inverter. The inverter software controls the fan speed. The lifetime of the
fans depends on the installation area and internal temperature of the inverter. The
typical replacement time for the fans is after eight years of use.
The inverter shows a warning to the user when the fan run-time counter is near the
calculated life time. After this warning, the inverter and fans operate normally, but you
must replace the fans to guarantee the optimal operation of the inverter.
If the fans do not operate when they should, the inverter shows a warning to the user.
In this case, the inverter continues to operate, but it can limit the output power or
suffer overtemperature trips.
Replace the external and internal fans when the unit indicates or if they malfunction.
Refer to External fan replacement on page 104 and Internal fan replacement on page
106.
Refer to the PRO-33.0-TL Service menu guide (3AXD50000015823 [EN]) for
information on how to reset the fan run time counters.
String fuses and surge protection devices (-SX model)
On the -SX model, you can replace the string fuses and replace surge protection
devices. Refer to String fuse replacement (-SX model) on page 107 and Surge
protection device replacement (-SX model) on page 108.
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