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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 – Start delay setting 0.1 second.
T2 – Reaction time setting 3.0 seconds.
A – Hysteresis 20 %.
B – Limit value 30 %.
C – 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
consumption has fallen 20 % below 9 A, i.e. to 7 A without a time delay.
A T2 B
C T1
9
Wiring Diagram
Wiring Diagram l 9-5