Motor Starter

The starter also complies with the following specification as the standard. Accordingly, when the starter is purchased from a manufacturer other than our Company, the starter shall meet the same specification.

2.1 Structure of starter

The casing box shall be of steel make, drip-proof, wall-hanging type. Installation shall be made on rear side at four upper and lower corners of the casing box and shall be round holes for upper part and slots for lower part so as to permit easy installation. Further, for introduction of external wires, comings are provided.

2.2 Components

Ammeter, push buttons and indicating lights are installed at the door and electromagnetic contactor, overload relay, time limit relay, auxiliary relay, fuse and terminals, etc., in the box.

2.2.1 Ammeter

The ammeter able to measure current directly above or approx. 120% of rated current, with the maximum scale of 3-time extension, is employed.

On the other hand, as the ammeter is required to monitor the operating conditions of SELFJECTOR, it must be installed.

2.2.2 Overload relay (thermal relay)

This shall be of a manual return type with time limit characteristics, and the current settings shall be rated current values given in Table 4.3.

2.2.3 Time limit relay (timer)

In connection with the characteristics of SELFJECTOR. Starting current of the following types will be over current of about 150% for several minutes at the time of start-up, so a division circuit is provided for prevention of actions of overload relay by installing Timer (variable timer for 10 minutes).

2.3 Wiring of starter

For reference, the SELFJECTOR starter internal connection at AC 440V is shown in Fig. below.

Wiring of starter

 

NOTE
1. Terminals No. PR, PC and PA serve for external indication and shall be connected to monitor panel. 2. Terminals MI 1, 12, MI, 5 and M6.10 are to be connected to the automatic control panel.

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