BLOG.CERUSONLINE.COM: Recent Comments

Comment on Why are Electronic Contactor Coils Important?

Alien — Mon, 21 Sep 2009 06:11:42 GMT

Блог отличный. Надо бы Вам награду вручить за него или просто почетный орден. ;)

Comment on Why are Electronic Contactor Coils Important?

Ethan N Broten — Mon, 14 Sep 2009 17:52:39 GMT

Hi Austin,

There are many different styles of contactors and coils so it might be a good idea for you to give us a call at your convenience if you are having any difficulty with the mechanical aspect of installing or replacing a coil in a contactor. We can actually grab the same contactor that you may be working with and describe everything for you in real time over the phone. That being said, the electronic coils for the CRC-100 - 800 line of contactors are usually fairly easy to replace. The coil is removed from the contactor by lifting up on the small orange releasing tab located between and below the A1 and A2 terminals of the coil and then gently sliding the coil out and away from the contactor. The tricky part is removing the solid metal core from the old coil and swapping it over to the new coil you’re installing. This can sometimes be difficult and it does require a good deal of force to release the metal core from the tabs that hold it to the coil. Please feel free to give us a call if you’re having trouble with this part and we’ll be happy to help walk you through the best positions to apply the force needed to separate the core from the coil. Once the core has been transferred to the new coil, the completed coil can simply be slid back into the contactor housing until the orange release tab locks back into place. If you have any questions or if there is anything else we can help you with please let us know. We’re available Monday - Friday 7:30A.M. - 4:00P.M. Pacific Standard Time.

Sincerely,

Ethan N. Broten

Technical Support Representative

Direct: 503.906.1214

Toll Free: 1.800.962.3787 ext.214

Fax: 503.643.4925

Comment on Why are Electronic Contactor Coils Important?

Austin electrician — Fri, 11 Sep 2009 17:28:23 GMT

It looks like I might need further assistance in installing electronic coils, not on the electric part but on the mechanical part. Thanks for providing informational support!

Comment on Smart Starters for Smart Buildings

Marcus — Thu, 20 Aug 2009 20:30:32 GMT

This is a pretty good little overview of your products. I appreciate the easy access to product specifications and information.

Comment on Comments/Questions

Ethan — Fri, 07 Nov 2008 00:08:31 GMT

Hi Steve,

You're right, usually in the situation you've described, the problem is that the pressure transducer has failed and is no longer sending a signal to the drive. The drive interprets a zero feedback signal as no pressure in the lines and ramps up to full speed trying to increase the pressure in the system. Do you have a part number for the transducer that is being used? There are multiple styles and ranges of transducers sold by Cerus alone and, in many applications, the customer opts to purchase the transducer separately as well so, without the part number, there is no way for us to provide detailed information on the transducer that is currently installed in your system.

There are other possible causes for this problem as well but a failed transducer is the most common cause in these situations. The simplest way to tell for sure is to look at the FBK value on parameter DRV-18 on the drive. This is a 0-60Hz display based directly on the feedback signal that the drive is seeing from your transducer. So, for example, if you’re using a 0-100psi 4-20mA transducer and your system pressure is currently at 40psi, you should see 24.00Hz as the FBK value on parameter DRV-18. The REF value on parameter DRV-18 is your desired pressure set point (entered on DRV-00) displayed in a 0-60Hz value as well so, put simply, the drive will be trying to adjust it’s output speed to make the FBK value match the REF value. If the FBK value is lower than the REF value, the drive increases it’s output in an attempt to bring the FBK value back up to the same level as the REF value and vice-versa.

If you continue to have difficulty troubleshooting the problem it can be very helpful for someone who is actually in front of the drive to call us up and we can help walk them through specific troubleshooting steps over the phone. If you have any questions or if there is anything else I can help you with please let me know. I am available Monday - Friday 7:30A.M. - 4:00P.M. Pacific Standard Time.

Sincerely,

Ethan N. Broten

Technical Support Representative

Direct: 503.906.1214

Toll Free: 1.800.962.3787 ext.214

Fax: 503.643.4925

Comment on Comments/Questions

Steve — Thu, 06 Nov 2008 23:10:06 GMT

the P series drive we installed mid-summer for a deep well application has been working fine until today. the pressure builds so high it blows the relief valve at the pressure tank. pressure transducer right? anything special about this tranducer? what is the max pressure of the sensor? could it be something else?