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Thyristor Based Control Panel for 75VDC/300A Rectifier
Thyristor Based Control Panel for 75VDC/300A Rectifier
Libratherm Instruments Pvt Ltd offers a wide range of thyristor based control panel for 75vdc/300a rectifier.
- Libratherm control panel featured here is designed
to generate a variable DC supply of 0 to 75VDC at max. 300A current.
- The
control panel featured here is designed to generate a variable DC supply
of 0 to 75VDC at max. 300A current. Libratherm model POW-3-DCR-400A, a
three-phase AC to DC rectifier made using 6 SCRs in full-wave full control
configuration has been incorporated.
- The
application of this control panel is to meet the requirement of an
Electroplating plant requiring variable DC voltage at the constant current
for the electrolysis process.
- Three-phase
input to the DCR is derived from an external 3 phase 25KVA step down
transformer having a primary of 415VAC and a Secondary of 120VAC. DCR
generates the DC voltage proportional to the control signal received
either from the Libratherm model DVC-966 in Auto control or from the front
panel potentiometer in Manual control. DVC 966 is the high-speed PID
controller specially designed for rectifier control to maintain a constant
voltage and constant current across the variable load.
- The DC
voltage and DC current output of the DCR is fed to the DVC-966 through the
signal conditioner/isolator. DVC-966 indicates both DC voltage and DC
current and also has the facility to set the desired voltage across the
load. The constant current control across the load is achieved by the CT
feedback to the DCR.
- The
ripple in the DC voltage output is filtered using suitable electrolytic
capacitors. The programmer version of DVC-966 also facilitates the user to
program the voltage versus time profile for the gradual increase, soaking,
and gradual decrease of the desired DC voltage across the load.
- The
front of the panel also has separate digital voltage and current meters to
online monitor voltage appearing across the load and current flowing
through the electrochemical in the plating process. The presence of an
incoming 3 phase supply is indicated by the RYB lamp. The incoming supply
is turned ON or OFF using the 100A MCCB accessible to the user from the
front side of the panel.
- The
POW-3-DCR-400A, MCCB, DVC-966, a DC Voltmeter, a Currentmeter along-with
the other required accessories are housed in the MS fabricated control
panel which is duly Siemens grey color powder coated. Terminals and
busbars are provided for connecting the transformer primary, DC output,
and incomer 3 phase supply. The panel is mounted on a stand for onsite
wiring and cabling.
- This
rectifier control panel has been installed and working satisfactorily at
the customer end since January 2019.
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