NORDAC FLEX (SK 200E ... SK 235E) – Users Manual for Frequency Inverters
276 BU 0200 en-3118
9 Maintenance and servicing information
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9.1 Maintenance Instructions
NORD frequency converters are maintenance free provided that they are properly used (please see
chapter 7 "Technical data").
Dusty environments
If the device is being used in a dusty environment, the cooling-vane surfaces should be regularly
cleaned with compressed air.
Long-term storage
The device 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 device may be destroyed.
If a device is to be stored for longer than one year, it must be recommissioned 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).
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Control voltage with SK 2x5E
With devices of type SK 2x5E, a 24 V control voltage supply must be provided in order to make the regeneration
process possible.
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The regulations for long-term storage apply to the accessories, such as 24
(SK xU4-24V-…, SK TU4-POT-…), and the electronic brake inverter (SK CU4-MBR) likewise.
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