Automationdirect.com Stellar SR44, User Manual

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Chapter 2: Electrical Installation
2.10.4 – Overload Current Profile AC-53b
IEC 60947-4-2 Motor Utilization Category: AC-53b (operating in bypass mode)
IEC Index Ratings for bypassed operation are comprised of Rated Operational Current (I
e
),
Utilization Category AC-53b, Overload Current Profile (X-T
x
), and OFF-time.
Index Rating Example – Bypassed Operation
(AC-53b Utilization Category per IEC 60947-4-2)
SR44 Index Ratings (for AC-53b) *
Soft Starter
Model Number
I
e
(A)
Bypassed Operation
UC X-T
x
OFF-time
SR44-9 to SR44-105
9 to 105
AC-53b
AC-53b
5-4
3-35
120
120
SR44-146 to SR44-202
146 to 202
AC-53b
AC-53b
4-6
3-35
120
120
SR44-242 to SR44-370
242 to 370
AC-53b
AC-53b
4-6
3-35
420
420
* Index ratings AC-53a and AC-53b are specified by IEC standard # 60947-4-2
AC-53b Overload Current Profiles (applicable to specified Soft Starter models)
Soft Starter Model
X
Overload Current
(multiple of I
e
)
T
x
Duration of
Overload
(seconds)
OFF-Time
(seconds)
SR44-9
to SR44-105
3 35 120
5 4 120
SR44-146
to SR44-202
3 35 120
4 6 120
SR44-242
to SR44-370
3 35 420
4 6 420
9 to 105 - AC-53b: 5-4; 120
OFF-time
120 = 120s minimum OFF-time before restart
Overload Current Profile (X-T
x
)
5-4 = 5 times rated current (I
e
) for 4s
Utilization Category
AC-53b =
controller semiconductors provide squirrel-cage motor Start control only; bypassed for Run and Stop
Rated Operational Current (I
e
)
9 to 105 = controllers with Rated Operational Currents from 9A to 105A
The unit can accommodate
(5)x(I
e
) for 4 seconds, but
requires 120 seconds before
initiating any subsequent restart
SR44 Series Soft Starter User Manual
1st Ed, Rev B 07/31/2019
2–18