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Safety
Rating
Mechanical
Information
Data
Installation
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
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
40 ºC <1000 metres
D3-1x-0255-N
D3-1x-0360-N
D3-1x-0430-N
D3-1x-0650-N
D3-1x-0790-N
D3-1x-0930-N
D3-16-1200-N
D3-16-1410-N
D3-16-1600-N
Table 2-6 Current ratings - inside delta (6-wire) connection, non-bypassed operation
Model
40 ºC <1000 metres
D3-1x-0255-N
D3-1x-0360-N
D3-1x-0430-N
D3-1x-0650-N
D3-1x-0790-N
D3-1x-0930-N
D3-16-1200-N
D3-16-1410-N
D3-16-1600-N
10
Electrical
Keypad
Quick Start
Installation
and Status
Commissioning
3.5 -
15 : 50
-
6
AC53a 3-10:50-6
AC53a 3.5-15:50-6
40 ºC <1000 metres
255 A
360 A
430 A
650 A
790 A
930 A
1200 A
1410 A
1600 A
AC53a 3-10:50-6
AC53a 3.5-15:50-6
40 ºC <1000 metres
382 A
540 A
645 A
975 A
1185 A
1395 A
1800 A
2115 A
2400 A
Operation Programming Diagnostics Application
Starts per hour
On-load duty cycle (%)
Start time (seconds)
Start current (multiple of motor full load current)
Starter current rating (amperes)
AC53a 4-20:50-6
40 ºC <1000 metres
222 A
195 A
351 A
303 A
413 A
355 A
629 A
532 A
790 A
694 A
930 A
800 A
1200 A
1135 A
1355 A
1187 A
1600 A
1433 A
AC53a 4-20:50-6
40 ºC <1000 metres
334 A
293 A
527 A
455 A
620 A
533 A
943 A
798 A
1185 A
1041 A
1395 A
1200 A
1800 A
1702 A
2033 A
1780 A
2400 A
2149 A
Technical
Maintenance Options
Examples
Data
AC53a 4.5-30:50-6
40 ºC <1000 metres
171 A
259 A
301 A
437 A
567 A
644 A
983 A
1023 A
1227 A
AC53a 4.5-30:50-6
40 ºC <1000 metres
257 A
388 A
451 A
656 A
850 A
966 A
1474 A
1535 A
1840 A
Digistart D3 User Guide
Issue: F
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