Application Notes

EAP-032133


Monitor a driving current of motor
 

We’d like to monitor a driving current of a motor, which is installed in our factory line. If the driving current becomes over-current, we need to send an alarm contact signal to a PLC so that the PLC can send a shutoff signal to the motor. However, we don’t need to respond to inrush current, which is usually generated when motor boots up.

Does M-System have a suitable unit to meet the requirement above?

MS Word

We’d like you to use our CT Alarm unit, model AS4CT.

The AS4CT has “Alarm ON-delay time” function, which enable you to set an alarm delay time from 0 to 99 seconds. With this function, the short time motor startup inrush current will be ignored and you can monitor motor driving current only for normal operation period and then the AS4CT activates Hi alarm contact once it detects over-current. In addition, the AS4CT has other useful function of “Power ON-delay time”. This function is useful when you need to set Lo alarm contact.

Typically, undervalued current will be generated when the unit is powered on.

With this “Power ON-delay time” function you can prevent the unit from responding to undervalued current in order not to activate Lo alarm contact. Adjustable power on-delay time is from 0 to 99 seconds.


CLOSE
Copyright © 2007 MG Co., Ltd. All rights reserved.