1 General
BU 0505 EN-3021 13
1.2.3 Which type of inverter should be used?
There is no general answer to this question. In principle, an inverter with an integrated EMC-mains
filter (…-A) is preferable, as the EMC requirements are fulfilled by this device. However, under certain
circumstances an "...-O" inverter must be used.
In particular for critical (harmonic) mains supplies, or with the use of an input choke, (SK CI1-…) an
"…-O" inverter should be used.
How can critical mains supplies be recognised?
a. Increased link circuit voltages in Standby or even overvoltage error messages indicate
resonance effects. The actual applied voltage can be checked and investigated for plausibility
via the information parameters of the frequency inverter (P728 - Input voltage/Mains voltage,
P736 - Link circuit voltage, or P753 - Statistics for overvoltage/Number of E005 error
messages).
b. In the network there have already been failures of frequency inverters with damage to the link
circuit capacitors or to the EMC mains filter circuits.
c. Sliding contacts in power rails may cause brief power interruptions (e.g. transport carriages in
high bay storage warehouses).
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1.3 Delivery
Check the equipment immediately after delivery / unpacking for transport damage such as
deformation or loose parts.
If there is any damage, contact the carrier immediately and carry out a thorough assessment.
Important! This also applies even if the packaging is undamaged.
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1.4 Scope of supply
• IP20
• Integrated brake chopper
• Integrated EMC mains filter for limit curve A1 or Category C2 (only inverters
of type SK 5xxE-…-A)
• Blanking cover for the technology unit slot
• Screening terminal for control terminals
• Covering for the control terminals
• Size 1 to Size 7: Accessory bag with wall mounting brackets
• Size 8 and above: miscellaneous electrical connection material
• Screw (2.9 mm x 9.5 mm) for fastening the blanking cover or an optional
SK TU3-… technology unit
• Operating instructions on CD
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