Soft Starters Frequently Asked Questions
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Question:
How does repeated Jogging affect the sizing of the starter?
Answer
Repeated jogging has no affect on the sizing of the starter but jogging the motor is a starting event and will heat the thyristors. The addition of a cooling fan will reduce cooling time, increase the number of Starts and Stops per hour and should be strongly considered.
FAQ ID: 1256
Question:
Is the starter sensitive to line voltage imbalance?
Answer
No, the starter will only fault on complete loss of phase voltage.
FAQ ID: 1257
Question:
Is Stop time > zero detrimental to the starter with an overhauling load?
Answer
It is not recommended and may be detrimental to the starter!
FAQ ID: 1259
Question:
Does the starter measure line voltage phase angle or difference of potential?
Answer
The starter measures voltage and NOT phase angle.
FAQ ID: 1260
Question:
With power applied and no connected load will the starter output measurable voltage?
Answer
No, the lack of a load will result in a starter fault as soon as it is started.
FAQ ID: 1261
Question:
What does “10 starts per hour vs 5 starts +5 stops per hour" mean?
Answer
10 starts per hour implies zero stop time vs 5 starts with stop time > zero.
FAQ ID: 1262
Question:
How does overload class 10B differ from class 10?
Answer
The difference relates to the AC53b load cycle rating of the starter. Where class 10 allows for 3 times the starters rated current for up to 23 seconds, class 10B allows for 3.5 times the starters rated current for up to 12 seconds. Motor overload protection is class 10.
FAQ ID: 1263
Question:
What is the scope of “Type 1 Coordination�?
Answer
Type 1 coordination relates to the protection of the starter only.
The starter may be damaged and may require replacement.
IEC60947-4-1, Section 8.2.5.1:
Performance under short-circuit conditions (rated conditional short-circuit current)
“Type "1" co-ordination requires that, under short-circuit conditions, the contactor or starter
shall cause no danger to persons or installation and may NOT be suitable for further service
without repair and replacement of parts.�
FAQ ID: 1264
Question:
Can the SR44 be configured for 'Auto Start/Re-start'?
Answer
Yes. Soft-start must be set up for remote starting:
Basic --> Starting (select remote starting)
- Activate i/p 1 (110Vac applied to "S1" and "S0" terminals)
- If soft-start is running and main & control powers are lost, then upon re-application of power, with i/p 1 activated, the soft-start will operate the connected motor. Note i/p 1 will still serve as the start/stop control.
Note: The SR44 line has been discontinued
For currently available soft starters, please see Soft Starters on the web site.
FAQ ID: 1375
Question:
Do you have any recommendations for a repair/service shop for the Stellar soft starters?
Answer
We recommend:
Specialized Electronic Services
972-680-9210
There are likely other industrial product repair shops like Radwell that may perform repairs, but we don't have specific information, other than for SES above.
FAQ ID: 1591