Necessary protections must be at welding machine primary , and start with minimum current.
without protections inadequate operation may damage the machine.
Low voltage high current injection units will help( or old welding machine ).
For Metal Pipes Use current from welding machine ( without Grounding ) , Connect between flange to flange , the line and the Solid ice will be heated fast .A little current will leak to earth , but the purpose shall...
reena1957 is Correct ,
The weight (force ) required for 0.6kg/cm2G with inlet Dia of 0.4mt shall be calculated as follows.
Weight(force) =
Set pressure (in Kg/cm2G) * inlet area of the valve (in Cm2)
In your case it is
0.6 kg/cm2G * 1256 cm2 = 753.6 kgf.
The Lever system should excert...
if Going for changing the type of level measuremnt, The best choice is guided wave .The displacer instrument also will subject to the pressure surges to some extend .
INFO : Siemence STEP7 programm has a built in PLC simulator to test the programm . A bit Preliminery knowledge is essential,But is usefull for learners who dont have PLC acces.
davidbeach,
I can agree with you only if the protection programms are put in cyclic scan ...In that case Typical scan time lies between 100ms to 500 ms.
But
It can perform very fast protection functions (while online) with an inturrupt programm which temporarily hault cyclic program...
The Primary Level of protection must be within The drive .
(Protections with External /other units (like PLC )are not an alternative for this .)
Yet ,One can have addtional secondary protections in external systems ( Like PLC ).
In the event of primary detection failure the secondary will...
If it is a single unit of Power source I Suspect you had bad connection ,which burned by severe ground fault in system.
I my opinion (opinion only ) faults while in a synchronised system may result the same situation if the weakest point( Bad Connection ) was neutral- Ground connection and...
Hope You have a displacer type level instrument ,a level controller at DCS for level control and a control valve on line.
It can be a problem at low ampient Temperature ( It happenes very rarely )
1. with electronics circutry of level controller or
2. with electronic circuite of i/p...
