Fault Fi Nding - Danfoss VLT Pocket Manual

Fault fi nding: What are the key questions?
To assist your service engineer, they require the following information:
• Model and serial number of the soft starter
• Motor kW and FLC
• Main supply voltage and frequency
• Control voltage
• Application (e.g. pump, compressor)
• Time installed before failure
• Details of other soft starters on the supply bus. Are these failing?
• If the soft starter trips, details of the code and mode of operation
• The installation's power and control schematic diagram
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VLT Soft Starter Pocket Guide 19