Considering a soft starter, how to size the line contactor?

The line contactor must be sized in AC-3 category with a current greater or equal to the motor full load current (FLC).   Example Motor rated current = 28 A Soft starter rated current ≥ 28A AC-3 (e.g. ADXL0030600 à 30A) Line contactor ≥ 28A AC-3 (e.g. BF3200A230 à 32A AC-3)         [...]

By |2021-06-17T15:08:38+02:00June 17th, 2021|, , |Comments Off on Considering a soft starter, how to size the line contactor?

Considering a soft starter, how to size the external bypass contactor?

Bypass contactor should be AC-1 rated for the motor full load current (FLC) because it does not carry the starting current.   ______________________________________________________________________________________________ Other information on this topic Visit the website page dedicated to contactors. Check out our video on BF series LOVATO Electric – Contactors BF series Visit the website page dedicated to ADXL… series soft [...]

By |2021-06-17T14:51:50+02:00June 17th, 2021|, , |Comments Off on Considering a soft starter, how to size the external bypass contactor?

How to command the line contactor when using a soft starter?

The command of the line contactor is managed automatically by the soft starter with a relay output programmed with the function LINE.CONT (sometimes also called Run according to soft starter models): LINE CONT. = the output closes at the start command and it remains closed all the time when the soft starter is feeding voltage [...]

By |2021-06-17T14:51:33+02:00June 16th, 2021|, , |Comments Off on How to command the line contactor when using a soft starter?

Considering a soft starter, can I replace its line contactor with a breaker?

Yes, it can be used circuit breaker with undervoltage trip. In case of fault the soft starter will interrupt the signal on the breaker undervoltage trip through a relay output, with consequence interruption of the current flow to the motor. But contactor it is preferable due to its high mechanical durability compared with circuit breaker which [...]

By |2021-06-17T14:49:43+02:00June 16th, 2021|, , |Comments Off on Considering a soft starter, can I replace its line contactor with a breaker?

What is the purpose of the line contactor for a soft starter? Is it mandatory?

It is a contactor installed upstream the soft starter to warrant a galvanic separation between the power supply line and the motor when the motor is not in use (stop). The presence of the line contactor is extremely important for the following purposes: 1.Safety of the personnel: it removes the voltage on the motor side [...]

By |2021-06-17T14:49:31+02:00June 16th, 2021|, , |Comments Off on What is the purpose of the line contactor for a soft starter? Is it mandatory?

In photovoltaic applications, where are contactors installed?

In the construction of photovoltaic systems, international standards and national rules must be kept in mind. The national rules may have significant variations between different nations. However, the contactors in photovoltaic applications are typically installed immediately upstream and downstream of the inverter. The contactor on the AC side is a common contactor that must be [...]

By |2021-06-21T15:15:27+02:00May 4th, 2021|, |Comments Off on In photovoltaic applications, where are contactors installed?

Can BFD contactors be used for applications other than photovoltaics?

BFD contactors are contactors specifically designed to interrupt DC loads. They find their major use in the photovoltaic applications, but are also suitable for any DC application such as railway traction, batteries control, telecommunication systems, DC drivers etc. _________________________________________________________________________________ Other information on this topic Visit the website page dedicated to contactors. Check out our videos on [...]

By |2021-06-17T14:47:04+02:00May 4th, 2021|, |Comments Off on Can BFD contactors be used for applications other than photovoltaics?

What is the utilization category of a contactor?

The utilization category specifies the nominal electrical performance of the contactor referred to a specific type of load. In the IEC / EN60947-4-1 standard, for each utilization category, the test conditions to which the contactor must be subjected to verify its operational effectiveness are prescribed. The most common utilisation categories for contactors are: AC-1 Non-inductive [...]

By |2020-12-18T12:25:28+01:00December 18th, 2020|, |Comments Off on What is the utilization category of a contactor?

How do the performances of a contactor change by connecting the contacts in series or in parallel?

On the contactors the contacts are connected in series to increase the breaking capacity on DC loads; typically, more the load voltage increases, more contacts in series are needed to achieve an adequate breaking. The poles in parallel increase the current carrying capacity of the contactor. Take in consideration that the poles in parallel do [...]

By |2020-12-18T12:21:14+01:00December 18th, 2020|, |Comments Off on How do the performances of a contactor change by connecting the contacts in series or in parallel?

What is the limit ambient temperature for the correct operation of the contactors?

The standard IEC / EN60947-4-1, referred to the contactor, of the contactors, prescribes that the operation of the contactors have to be within the temperature range of -5… + 40 ° C. In this temperature range the devices must guarantee correct operation with their maximum rated load. It is quite common for contactors to work [...]

By |2020-12-17T08:12:25+01:00December 16th, 2020|, |0 Comments
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