Frequently Asked
Questions
Panel
Automation
Q. 1: The PT431 three-phase monitor very often interrupts its output (deactivates the relay), thus very often interrupting the pump operation. Why is this happening?
The network is experiencing very large fluctuations so the monitor interrupts its output to protect the pump motor, or you have set the monitor sensitivity too low for the current conditions (e.g. 5%). Try setting the sensitivity to a higher value, e.g. 15%, to eliminate the problem.
Q. 2: The PT431 three-phase monitor does not arm its relay, even though the phases are within the asymmetry limits set. What's wrong?
The three phases are connected in the wrong order (sequence) so you must reverse any two of them for the relay to arm (phase sequence check).
Q. 3: The PT414 level controller arms and disarms its relay randomly (operational instability). What is the problem?
The electrodes of the level controller are connected with an excessively long small-diameter cable (more than 300 metres). Either reduce the length of the cable, or replace the cable with a thicker cable or use an adjustable sensitivity level controller.