How to check relevant current values for present application

To find out the relevant current values, use descripton as follows:

 

 

 

 

 

 

 

HA= main winding              Hi= auxiliary phase winding              S= circuit breaker

                    

How to measure pick-up current Operation voltage - 20% Auxiliary phase disconnnected (S= open). Motor blocked, winding in hot condition. Measure in blocked condition and maximum safe operation temperature.

How to measure the drop-out current Operating voltage + 15% Main- and auxiliary phase winding connected (S= closed). Motor no-load, with room temperature. Measure in idle-run and before winding temperature is increasing.

 

Selection of suitable relay type

Selection of the type of relay is made acccording to determined pick-up current and drop-out current out of relay type list. The most important value for the selection is the pick-up current.

The determined drop-out value must be always lower than drop-out current mentioned in the type list.

This is very important to guarantee, that the relay contacts are opened again safely and switch off the auxiliary phase.

 

Operating Characteristics

For the selection of the correct type of starting relay there are 2 significant parameters:

1.  Pick-up current

Current limit, when the relay is closing the relay contacts and auxiliary phase is switched on.
 

2.  Drop-out current

Current minimum, when the relay is opening the relay contacts again and auxiliary phase is switched off.

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