Internet PLC Forum

General => Technical support => Topic started by: Joel Moore on September 07, 2006, 09:54:47 AM

Title: Max input power voltage
Post by: Joel Moore on September 07, 2006, 09:54:47 AM

A customer in Mexico is having trouble with our machine.  Our field technician is measuring 30-32V at the power input for the PLC thanks to the horrible AC provided by the factory (AC line voltage measuring nearly 300V on what's supposed to be 220)!.

Could this amount of excessive DC voltage damage the PLC?

Title: Re:Max input power voltage
Post by: support on September 07, 2006, 11:06:08 AM

Are you using a regulated switching or linear power supply? A regulated supply should be able to maintain the output voltage regardless of line voltage or it will shut itself down.

If your regulated supply is giving out 30V when it is supposed to give out only 24V then it is probably cooked. The output may not be clean DC anymore and that could give rise to quite a bit of problems.