NORD Drivesystems BU0700 - Manual (Page 125)

8 Additional information
BU 0700 GB-1411 Subject to technical alterations 125
8.6 Maintenance and servicing information
In normal use, NORDAC SK 700E frequency inverters are maintenance free. Please note the "general data" in Section 7.1.
8.6.1 Maintenance notes
Dusty environments
If the frequency converter is being used in a dusty environment, then the cooling-vane surfaces should be regularly cleaned with
compressed air. If air intake filters have been built into the control cabinet, then these should also be regularly cleaned or
replaced.
Long-term storage
The frequency inverter must be regularly connected to the supply network for at least 60 min.
If this is not carried out, there is a danger that the frequency inverter may be destroyed.
If a device is to be stored for longer than one year, it must be recomissioned with the aid of an adjustable transformer before
normal connection to the mains.
Long-term storage for 1 - 3 years
30 min with 25% mains voltage
30 min with 50% mains voltage
30 min with 75% mains voltage
30 min with 100% mains voltage
Long-term storage for >3 years or if the storage period is not known:
120 min with 25% mains voltage
120 min with 50% mains voltage
120 min with 75% mains voltage
120 min with 100% mains voltage
The device must not be subject to load during the regeneration process.
After the regeneration process, the regulations described above apply again
(at least 60 min on the mains 1x per year).