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Hi to all. I have noticed some tripping of a Danfoss inverter VLT5000 with alarm 14 EARTH FAULT. After recycling the power and resetting the inverter it resumes normal operation. Is there any logical explanation for this ? Earth fault is a short circuit between phase and earth and is something...

Thanks for your answer m777182. I suppose that the rings are for achieving the same potential between inlet and outlet of the plastic pipes but i was waiting for a justification.

Hello to all. i am new to this forum and i want to ask for your help to the following. i want to know which are the maximum allowed operating temperatures ( or temperature rises) in conductive materials like busbars, cables, contactors, circuit breakers, terminals, cable joints etc. I find this...

I have install a system for the combined measurement of pH and ORP(redox) in a starch slurry tank. The electrode is Mettler Toledo 3250SG and it is cleaned periodically. Unlikely i have noticed a permanene deviation of pH measurement (sensor 2,95, laboratory measurement 3,3). Which are the...

Hello I have to install flowmeters in PPE pipes for measuring the flow of HCl(hydrochloric acid) 35%. Should i install the grounding rings as the manufacturer suggest? And also what is the straight unimpeded run at the inlet of the flow sensor? The manufacturer suggest 5xD (sensor diameter)...

Hello I want to connect a load cell transmitter to a Simens S7-300 CPU in order to collect more accurate data and have the totalizer in my PLC code and not done by the weighing transmitter itselff. How can this be relaised ? Of course i will need serial cable and progrmming. Is there any...

Hi guys I am working on a thermpographic survey of my plant and i want to find the highest temperature limits in which an electrical equipment, like a circuit breaker or a fuse switch disconnector can work. The manufacturers state always the ambient temperature, not the working themperature of...

Hello to all. I am looking for the operating temperature limits of electrical installation equipments. From the manufacturers manuals it is indicated only the maximum permissable ambient temperature. From other web sources i have seen that there is a direction reference to a term called...

Hello I want to ask for some help about the creation of standard ATXE library for my industrial process. Is there any dosument in internet which i can use for my job ?

Hello I want to create a library with ATEX directives for the process lines of the industry where i work. Can you tell me for some resources in the web where i could find useful data ? Thanks in advance for your time.

Thank you all for your time and advise. I am doing what most of you suggested. Connect the capacitors to the live part of the contactors (after the fuse disconnector) and give control voltage to the capacitor contactor from a auxiliary contact of the delta contactor. laundry the motor is 0.79 pf...

First of all thanks for your response. I have already purchased Siemens capacitor contactors and i am thinking to energize the capacitor when the D-contactor(triangle-full speed) is on. I will connect them after the fuse-switch disconnector instead of using dedicated fuses for the capacitors...

Hello to all. I have a star-delta starter for a 37kW motor(400V,50Hz) and i want to connect the 30kVar capacitors to the circuit. What is the best connection scheme that i should use ? I want also to use a capacitor contactor. Thank you very much for your time.

Hello. I have installed a Intrac mechanism for a combined pH/redox electrode with automated cleaning system. I have checked that after cleaning the pH reading is coming to its normal value after 1 minute but for the redox(ORP) reading there is always an offset of +40 mV. The temperature before...

rraghunath Thanks for the reply Is there any documentation from web where i can see more details. In all the manufacturers that i have search i have seen that the give only assmbly instructions for the main contacts.

Hi . I want to make a study about the temperature effect on switchboards. I ahve found enough docs on internet except from one subject : the temperature of the main contacts of a contactor or a circuit breaker. In all the documentation i have seen specifications for the ambient temperature but...

Hi to all and many thanks for your responses. I tried the setting with 30 seconds in parameter P003. After that we stop the inverter without any overvoltage trip F001. Also about the vector control , it seems that the inverter in vector control is far better and has a more dynamic response (it...

Thanks for your time. weh The motor is 40HP/2pole/400V and drives a centrifugal fan. I have changed the operating mode P077 from 1 (flux current control) to 3(sensorless vector control). sed2developer I have also increased the ramp down time to 30 sec. Now i wait for the next stop command to...

Hi guys. I have an inverter Midimaster Vector (Siemens). After start-up we have periodically trips with code F001. There is not a problem in the load. I have chosen operating mode P077=1 and the ramp-down time is 12 sec. Can you tell me your opinion ? Thanks in advance for your time.

Hi there. I am ruuning a project for the replacement of switch disconnectors Rittal type SV3401 and SV3410 with magnetic breakers that should have the following features : 1) Theu must mount on thre-phase bars distance 60mm 2) They must be capable of receiving padlocks We want this...