Danfoss Drives · DKDD.PB.551.A1.02 | 15
AC53 utilisation codes describe the current rating for soft starters
under specied operating conditions.
The utilisation code determines the maximum motor size the
soft starter can be used with, under the specied conditions. The
current rating may change under dierent operating conditions.
AC53a: Non-bypassed soft starters
The rating depends on the number of starts per hour, the length
and current level of the start, and the percentage of the operating
cycle that the soft starter will be running (passing current).
AC53b: Bypassed soft starters
The rating depends on the number of starts per hour, the length
and current level of the start, and the amount of time the soft
starter will be o (not passing current) between starts.
Danfoss soft starters provide a relay output, which can
be used to control the main contactor. Ensure that the
inrush VA rating of the contactor coil does not exceed
the rating of the soft starter’s relay input.
AC53 Utilisation Codes: What are AC53 Utilisation Codes?
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