Conair FC-33 Podręcznik Użytkownika Pobierz pdf (Strona 42)

Example

The granulator is equipped with a current sensing relay to control a conveyor.

A motor of 7.5 kW has a rated current of about 15 A.

When this star/delta is started, it pulls about 15 A/ i.e. about 9 A per phase.

Relay setting:

Motor size 15 A/ = 8,7 A per phase

T1 Ð Start delay setting 0.1 second.

T2 Ð Reaction time setting 3.0 seconds.

A Ð Hysteresis 20 %.

B Ð Limit value 30 %.

C Ð Relay function N normal.

The current transformer size is 30/1A.

The current transformer is connected to E2 (1 A).

In a current transformer with a transformation ratio of 30/1, the limit value B

should be set to 30 % or 9 A (30 A = 100 %).

The current sensing relay detects the current consumption of the granulator

motor and stops the conveyor, when the granulator motor exceeds 9 A for

3 seconds, to prevent further material from being fed into the hopper.

The relay re-starts the conveyor automatically when the granulator motor con-

sumption has fallen 20 % below 9 A, i.e. to 7 A without a time delay.

CF Series Granulators UGG003/0398

38 WIRING

A T2 B

C T1

1 2 ... 37 38 39 40 41 42 43 44 45 46 47 ... 57 58

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Conair FC-33 Podręcznik Użytkownika Strona 42