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Elevator Contactor

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【Product Introduction】

 

What is the function of a contactor?
Contactors are used by electrical equipment that is frequently turned off and on with the opening and closing of a circuit. The function of the contactor is to make and break all power supply lines running to a Load or to repeatedly establish and interrupt an electrical power circuit.

 

How to choose a contactor for elevators


1.Contactor coordination:  required with the upstream circuit breaker
2.Main contactors directly controlling motors shall, in addition, allow 10% of starting operations to be performed as inching/ jogging, i.e. 90% AC-3 + 10% AC-4.

 

Main Contactor Type

 
1.Mirror contact: it is a NC contact identified by a dot. It is linked to the power contacts and can never be  closed so long as a NO power contact is closed.
2.Mechanically linked contacts: a direct mechanical link associates the NO and NC auxiliary contacts. It prevents  the simultaneous open state of the 2 contacts.

 

Contactor types for elevators what we supplied
 

Brand Type Model
SIEMENS elevator contactor 3RT1517-2BB40
SIEMENS elevator contactor 3RH2122-1BB40
Schneider elevator contactor LC1D09 AC110 AC220
FUJI  elevator contactor SC-03 AC110 AC220
FUJI  elevator contactor SC-5-15
FUJI  elevator contactor SC-4-1/G
Hitachi elevator contactor H50


How to use a contactor for elevators


1.Check the appropriateness of the contacts
The contacts and the closing pressure are sized according to the contactor rating.  It is the arc produced at circuit breaking which cleans the contacts.
2.Pay attention to the contacts connected to a PLC input
  • The current supplied by the input (I switched) may be very low, a few milliamperes, at a very low voltage ≤ 24 V.
  • The match between the switching characteristics of the auxiliary contacts and  the PLC current should be checked carefully.
  • The series connection of several contacts and large line lengths adversely affect this match.
3.Make sure to keep the contactors away from dust, moisture and chemical substances         
  • Contamination can be a cause of thermal overheating and an adversely affected lifetime.
  • Combined with low currents, it can be a cause of non-conducting poles.
4. To prevent contamination of the contacts
  • Before assembly, make sure to store the contactors and relays in a clean place.
  • Preferably choose assembly in an enclosure with a high degree of protection (IP55), equipped with a filter (to be replaced each year). 
  • Keep the contactors and relays away from the fan's air flow. 
  • Make sure that the enclosure is kept closed outside of technical inspections.
5.To reduce contactor noise
6.To identify relays belonging to safety chains