3.5.5 Derating for Installing Long Motor Cables or Cables with Larger Cross-Section
NB!
Applicable for drives up to 90 kW only.
The maximum cable length for this frequency converter is 300 m unscreened and 150 m screened cable.
The frequency converter has been designed to work using a motor cable with a rated cross-section. If a cable with a larger cross-section is used, reduce
the output current by 5% for every step the cross-section is increased.
(Increased cable cross-section leads to increased capacity to earth, and thus an increased earth leakage current).
3.5.6 Automatic Adaptations to Ensure Performance
The frequency converter constantly checks for critical levels of internal temperature, load current, high voltage on the intermediate circuit and low motor
speeds. As a response to a critical level, the frequency converter can adjust the switching frequency and / or change the switching pattern in order to
ensure the performance of the frequency converter. The capability to automatically reduce the output current extends the acceptable operating conditions
even further.
3.6 Options and Accessories
Danfoss offers a wide range of options and accessories for the frequency converters.
3.6.1 Mounting of Option Modules in Slot B
The power to the frequency converter must be disconnected.
For A2 and A3 enclosures:
•
Remove the LCP (Local Control Panel), the terminal cover, and the LCP frame from the frequency converter.
•
Fit the MCB10x option card into slot B.
•
Connect the control cables and relieve the cable by the enclosed cable strips.
Remove the knock out in the extended LCP frame delivered in the option set, so that the option will fit under the extended LCP frame.
•
Fit the extended LCP frame and terminal cover.
•
Fit the LCP or blind cover in the extended LCP frame.
•
Connect power to the frequency converter.
•
Set up the input/output functions in the corresponding parameters, as mentioned in the section
General Technical Data
.
For B1, B2, C1 and C2 enclosures:
•
Remove the LCP and the LCP cradle
•
Fit the MCB 10x option card into slot B
•
Connect the control cables and relieve the cable by the enclosed cable strips
•
Fit the cradle
•
Fit the LCP
VLT
®
AQUA Drive Design Guide
3 VLT AQUA Selection
MG.20.N5.02 - VLT
®
is a registered Danfoss trademark
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