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9 . 1 C u r r e n t s e n s i n g r e l a y
( c o n t i n u e d )
Example
The granulator is equipped with a current sensing relay to control a conveyor.
A motor of 55 kW has a rated current of about 97 A.
The current in one phase will be approx 97 A/ i.e. 56 A per phase. *)
Relay setting:
Motor size 97 A/ = 56 A per phase
T1 – Set reaction time is 3.0 seconds.
T2 – Set start delay is 0.1 second.
A – Limit value 56 %.
B
– Hysteresis 20 %.
C
– Yellow LED is lit, current is below the limit value.
D – Green LED is lit.
Function selection in mode without memory.
The current transformer size is 100/1A.
The current transformer is connected to E1 (1 A).
On a current sensing relay with a transformation ratio of
100/1, the limit value “A” should be set to 56 %
corresponding 56 A (100 A = 100 %).
The current sensing relay detects the current consumption of the granulator
motor and stops the conveyor, when the granulator motor consumption
exceeds 56 A for 3 seconds, to prevent further material from being fed into
the hopper.
The Yellow LED flashes when the current exceeds the set limit value, and
goes out when the conveyor stops. The Green LED is lit.
The relay re-starts the conveyor automatically when the granulator motor
consumption has fallen 20 % below 56 A, i.e. to 45 A without a time delay.
The Yellow and Green LEDs are lit.
*) If only one electric wire is passing through the center hole in the
transformer: Count with the current in one phase.
If a several electric wires are passing through the center hole in the
transformer: Count with the whole motor current.
A
C
T1
T2
D
B
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W i r i n g D i a g r a m l
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