Emerson Digistart IS1x0043B series - Page 10

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10 Digistart IS User Guide
www.controltechniques.com Issue: 4
2.2.2 Current ratings for continuous operation (not bypassed)
AC53a utilisation code
The AC53a Utilisation Code defines the current rating and standard operating conditions for a non-bypassed soft starter.
The soft starter’s current rating determines the maximum motor size it can be used with. The soft starter's 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).
The soft starter’s current rating is only valid when used within the conditions specified in the utilisation code. The soft starter may
have a higher or lower current rating in different operating conditions.
Figure 2-3 AC53a utilisation code
351 A
:
AC-53a
3.5
-
15
:
50
-
6
Starts per hour
On-load duty cycle (%)
Start time (seconds)
Start current (multiple of motor full load current)
Starter current rating (amperes)
Starter current rating: The full load current rating of the soft starter given the parameters detailed in the remaining sections of the
utilisation code.
Start current: The maximum available start current.
Start time: The maximum allowable start time.
On-load duty cycle: The maximum percentage of each operating cycle that the soft starter can operate.
Starts per hour: The maximum allowable number of starts per hour.
Table 2-5 Current ratings - in-line (3-wire) connection, non-bypassed operation
Model
AC53a 3-10:50-6
40 ºC <1000 metres
AC53a 3.5-15:50-6
40 ºC <1000 metres
AC53a 4-20:50-6
40 ºC <1000 metres
AC53a 4.5-30:50-6
40 ºC <1000 metres
IS3x0255N
255 A
222 A
195 A
171 A
IS4x0360N
360 A
351 A
303 A
259 A
IS4x0430N
430 A
413 A
355 A
301 A
IS4x0650N
650 A
629 A
532 A
437 A
IS4x0790N
790 A
790 A
694 A
567 A
IS4x0930N
930 A
930 A
800 A
644 A
IS561200N
1200 A
1200 A
1135 A
983 A
IS561410N
1410 A
1355 A
1187 A
1023 A
IS561600N
1600 A
1600 A
1433 A
1227 A
Table 2-6 Current ratings - inside delta (6-wire) connection, non-bypassed operation
Model
AC53a 3-10:50-6
40 ºC <1000 metres
AC53a 3.5-15:50-6
40 ºC <1000 metres
AC53a 4-20:50-6
40 ºC <1000 metres
AC53a 4.5-30:50-6
40 ºC <1000 metres
IS3x0255N
382 A
334 A
293 A
257 A
IS4x0360N
540 A
527 A
455 A
388 A
IS4x0430N
645 A
620 A
533 A
451 A
IS4x0650N
975 A
943 A
798 A
656 A
IS4x0790N
1185 A
1185 A
1041 A
850 A
IS4x0930N
1395 A
1395 A
1200 A
966 A
IS561200N
1800 A
1800 A
1702 A
1474 A
IS561410N
2115 A
2033 A
1780 A
1535 A
IS561600N
2400 A
2400 A
2149 A
1840 A