Search results

Samistor... There are 2 DC Power input voltages, one low, the other high. I suggest testing input-current magnitude at the power input terminals using a DC Clamp-On ammeter ! Regards, Phil Corso

Thibhika... I have an answer, but can you assure me that it is not for Academic Benefit ? Regards, Phil Corso

Samistor... PRK suggested a good start ! Have you measured it's current draw and compared it to it's rated capacity ? Regards. Phil Corso

Mehboob... To start can you provide the Nameplate data of the motor in question? Phil Corso

Mehboob... How about some details... Phil Corso

Gentlemen... The relay function can't be represented as a "Bridge". They are inductive ! And their H or mH have been lost to us mere mortals forever! Stay well, Phil

ControlSystemsGuru Great Demo Phil

Jacqui Is your system provided with a Sequence of Events Recorder (SER)? Regards, Phil Corso

Emily... True, in an DC circuit, but in an AC circuit, it alternates. Phil

ContolSystemsGuru... I'm now convinced this is a simple R-L-C timing circuit to continuously increase some process level and then reverse the process. Of course the key device is PIA-1. It must be "switched" at each extreme ! For example, a simple SPDT switch, possibly for a Bag or Container...

ContolSystemsGuru... The only fact I can come up with is that current-draw is virtually lossless in a capacitor ! Thus, total power losses are contributed by the resistor and relay! But, then I ask myself, why the resistor at all ? Phil

ControlSystemGuru; OneEye14. . . AC-powered control systems were not unusual in the '50s ! I began my controls career in 1952; started my controls engineering company "Automation Engineering" in 1955. My conclusion about the circuit in question is that it served that period's "fail-safe"...

barettod What is the current? Regards, Phil Corso

A simple method to confirm a suspected broken-bar is the problem is to hold a de-tuned portable AM radio close to the operating motor . It will "crackle" at slip frequency ! Also use forum's search feature for Post # 1026165830 Phil Corso

Amie... Yes. Especially those that alarm and trip upon loss of function! Are you following any official procedural documents ? Are you in charge of the Commissioning Engineers? Regards, Phil

Amie... They will be absent during the SC test! Are you in charge of the unit's Commissioning engineers ? Phil

Amie... Short-Circuit-Test of Generator reduces its output voltage to zero, thus all trip or supervisory functions related to voltage (at least 10) provided by the BECKWITH Relay go to zero for the duration of the test. Phil

Amie... During the SC Test the generator's output V is zero. The generator's SC output-current is usually raised enough to corroborate its rated synchronous reactance, Xd . What to you mean,""test in MV"? Phil

Amie.. Additional Information:.. Tests methods/procedures are available in both IEEE and IEC Standards. .You must disable any protective relay set to trip within the range you expect armature-current to reach! Regards, Phi Corso

Surya... I suggest you search Control.Com archives for "Generators That Don't Share Loads." Regards, Phil Corso