Danfoss VLT - 1.1.2 High Voltage Warning; 1.1.3 Safety Instructions

VLT
®
Soft Starter Pocket Guide 3
Soft Starter Selection Guide
Warnings ............................................................................................................................................. 5
Common Applications ................................................................................................................... 6
MCD Soft Starter Features and Specifi cations ...................................................................... 8
Current Ratings ............................................................................................................................... 10
Soft Starter Sizing .......................................................................................................................... 12
FAQs
AC53 Utilisation Codes ................................................................................................................ 13
Auto-Transformer Starters ......................................................................................................... 14
Bypass Contactor ........................................................................................................................... 15
Cabling ............................................................................................................................................... 16
Extreme Conditions ...................................................................................................................... 18
Fault fi nding .......................................................................................................................................19
Flying Loads ..................................................................................................................................... 20
Harmonics ........................................................................................................................................ 21
Inside delta Connection ...............................................................................................................22
IP Ratings .......................................................................................................................................... 23
Nema Ratings .................................................................................................................................. 24
Key Benefi ts ..................................................................................................................................... 25
Line Contactor ................................................................................................................................ 26
Minimum Start Current ............................................................................................................... 27
Motor Thermal Capacity ............................................................................................................. 28
Multiple Motors .............................................................................................................................. 29
Power factor correction .............................................................................................................. 31
Primary Resistance Starters ....................................................................................................... 32
Reversing .......................................................................................................................................... 33
Sealed Enclosures .......................................................................................................................... 34
Short Circuit Protection, Type 1 ................................................................................................ 35
Short Circuit Protection, Type 2 .................................................................................................36
Semiconductor Fuse Selection, Type 2 .................................................................................. 37
Slip-Ring Motors ............................................................................................................................ 38
Soft Braking ..................................................................................................................................... 39
Star/Delta Starters ......................................................................................................................... 40
Thermal Model Protection ......................................................................................................... 42
Two Speed Motors ........................................................................................................................ 43
Types of Soft Starter ..................................................................................................................... 44
Contents