Nord Drivesystems NORDAC FLEX SK 205E Series, Brief Instructions

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9 Maintenance and servicing information
BU 0240 en-US-4920 93
9 Maintenance and servicing information
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9.1 Maintenance Instructions
When used as intended, variable frequency drives are
maintenance-free
(please see chapter 7
"Technical Data").
Dusty environments
If the device is being used in a dusty environment, the cooling surfaces should be regularly cleaned
with compressed air.
Long-term storage
The device must be connected regularly to the supply network for at least 60 min.
If this is not done, 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 a
regulating transformer before normal connection to power supply.
Long-term storage for 1 - 3 years
– 30 min with 25% line voltage,
– 30 min with 50% line voltage,
– 30 min with 75% line voltage,
– 30 min with 100% line voltage
Long-term storage for >3 years or if the storage period is not known:
– 120 min with 25% line voltage,
– 120 min with 50% line voltage,
– 120 min with 75% line voltage,
– 120 min with 100% line 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
grid 1x per year).
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Information
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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Information
Accessories
The regulations for long-term storage apply to the accessories such as 24 V power supply modules (SK xU4-
24V-…, SK TU4-POT-…) and the electronic brake inverter (SK CU4-MBR).
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