نمایش موارد بر اساس برچسب: کنترل
سئوالات مرسوم در رکتیفایرها و کنترل - EGLISH
troubleshooting, testing and analysis
FREQUENTLY ASKED QUESTIONS
ABOUT RECTIFIERS & CONTROLS
BY PETER VAN GORP, AMERICAN PLATING POWER, FT. MYERS, FLA.
Q: I have few questions about Pulse Reverse current rectifiers: 1- Should we expect to getthe same ripple problems with PRC rectifier that we get from SCR DC ones? 2- Do the programmedcurrents for pulse and reverse rectifiers need to be readjusted from time to time?
A: 1. The answer to this question depends on what you mean by Ripple. ThePeriodic Reverse Pulse Rectifier (RPP) rectifies the input voltage to createa so called DC-Link. This DC-Link voltage has a very low Ripple, and isthen used to produce the output wave form. The result is both a ForwardCurrent and Reverse Current with a very small Ripple. However, the overalloutput wave form goes both positiveand negative, and thus can be considereda high Ripple waveform to your process.
2. The pre-programmed Current levels for both positive and negative pulseswill not need any adjustment since the regulation circuits will continuouslydetect and correct any variations.
Q: We are using cathodic electrodeposition, and we have an applied voltage of 350 Volt DC.We have a continuous problem as an arc at the contact point of the plating material (we useBolymar Ecoat Material). Is this problem related only to the contact points? Or are theresome other factors causing this problem?
A: The only other cause I can think of is if you are using an SCR rectifier withoutoutput filtering; you’ll measure 350 VDC RMS, but in reality the peak voltagesof the rectified voltage are higher (350 x √2 = 495V !!!). You can verify this bylooking at the .......................................
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