Mechanical Installation Considerations; Safe Transportation And Storage; Reforming The Capacitors - Danfoss VLT CDS 803 Manual

VLT® Compressor Drive CDS 803
Design Guide

5 Mechanical Installation Considerations

5.1 Safe Transportation and Storage

Store the drive in a dry location and keep the equipment sealed in its packaging until installation. Follow all instructions on trans-
portation and storage, and make sure that the ambient conditions are according to the specifications given in
tions.
• If the package is kept in storage for more than 2 months, keep it in controlled conditions:
- Make sure that the temperature variation is low.
- Make sure that the humidity is <50%.
• Only use lifting and handling equipment rated and suitable for the purpose.
- Check the weight of the drive and lift the drive with a lifting device if needed. In this case, use the lifting eyes/bars designed
for this purpose.
- Check the center of gravity on the packaging or on the drive before lifting the drive. Avoid tilting the drive to prevent it
from overturning.
• Keep the drive in its package until it has to be installed. After unpacking, protect the drive from dust, debris, and moisture.

5.1.1 Reforming the Capacitors

For drives that are in storage and do not have voltage applied, maintenance of the capacitors in the drive may be required.
To avoid damage to the internal DC-link capacitors, reforming is required if the drive has been stored without applying voltage for
more than 3 years. Reforming is possible only with drives with DC terminals. When reforming the capacitors:
• The reforming voltage must be 1.35–1.45 times the rated mains voltage. If the DC-link voltage stays at a low level and does not
reach approximately 1.41 x mains voltage, contact the local service agent.
• The supply current draw must not exceed 500 mA.
Table 10: Drive Storage Duration and Reforming Recommendations
Storage duration Duration reforming guideline
Under 2 years No reforming required. Connect to mains voltage.
2–3 years Connect to mains voltage and wait a minimum of 30 minutes before loading the drive.
Over 3 years Using a DC supply connected directly to the DC-link terminals of the drive, ramp up the voltage 0–100% of
DC bus voltage in increments of 25%, 50%, 75%, and 100% rated voltage under no load for 30 minutes at
each increment. See
36 | Danfoss A/S © 2021.05
Illustration 18 for an illustration of this method.
Mechanical Installation
Considerations
4.5 Ambient Condi-
AJ330233902305en-000201 / 130R0596