Motorized Variable Transformer Controlled Power Supply, 12 to 350 VDC, 500 ADC output

Product Overview

Variable DC power supplies are AC to DC power supplies with a variable DC output. The output can be varied with a Variable Transformer (also known as variac). The Variable Transformer can be adjusted manually or with a motorized control. The AC input power can be single phase or three phases. With single phase AC input, the DC output ripple is very high (50%). With three phase AC input, the DC output ripple is low (5%). This would be a key benefit for selecting three phase AC input instead of single phase.

The block diagram of the motorized variable transformer controlled power supply is shown below:

The photo of a motorized variable transformer controlled power supply, part number 18557PS is shown below:

Specifications:

• Motorized Variable Transformer Controlled Power Supply, P/N 18557PS
• Input: 380 VAC, 3 PH, 60 Hz
• Output: 12 to 350 VDC, 500 Amps max.
• Variable Transformer is used to vary the output.
• Input control is provided with a 10 turn potentiometer to cover full range from 12 VDC to 350 VDC.
• Ripple: 5%
• Indoor enclosure: 70″ H x 65″ W x 50″ D
• Weight: 4000 Lbs approximately
• Analog voltmeter and ammeter are installed to monitor the output.
• A 3 digit digital voltmeter is provided to fine tune the output voltage.
• All input/output connections are available inside the enclosure.
• The complete system is packaged as one enclosure.
• Motorized variac requires two minutes of travel time from minimum to maximum output.

CEHCO is a variable DC power supply manufacturer. To discuss your specific requirements, please contact us toll free at (800) 595-7096, or send us an email at info@cehco.com.

SCR Controlled Variable DC Power Supply (With Eurotherm Temperature Controller Feedback)

Product Overview

CEHCO is a SCR controlled power supply manufacturer.  This power supply has been used by a prestigious university in California for high current applications in Metallurgy, intermetallics, deformation mechanics, high temperature materials and composites.

The block diagram of the SCR controlled variable DC power supply, part number 18604PS is shown below:

The photo of the SCR variable DC power supply, part number 18604PS is shown below:

Specifications:

• SCR Controlled Power Supply, P/N 18604PS
• Input 480 VAC, 3 PH, 60 Hz
• Output 0 to 20 VDC, 500 Amps max
• All Input/Output connections are inside the enclosure
• Manual control for voltage and current limit provided
• Interface provided for Eurotherm Controller (0 to 10 VDC) for Eurotherm Temperature Feedback Control using 4/20 mA interface.

CEHCO is a SCR Controlled Variable DC Power Supply manufacturer. To discuss your specific requirements, please contact us toll free at (800) 595-7096, or send us an email at info@cehco.com.

Six Diode Bridge Assembly Using 500 Amp Diodes

Product Overview

CEHCO has considerable experience in building 3 phase rectifier bridge assemblies (electrical rectifier). Shown below is a 6 diode bridge assembly using 500 Amp threaded stud diodes. Each diode is rated for 500 Amps, 1200 PIV.

The photo and the schematic of the six diode bridge assembly, part number 14M-500A-1200PIV-6D-2F-120 are shown below:

Specifications:

• Six Diode Bridge Assembly, P/N 14M-500A-1200PIV-6D-2F-120
• Each diode is rated for 500 Amps, 1200 PIV
• Estimated dimensions: 20″L x 16″W x 10″H
• Two localized fans are provided for forced cooling. Customer responsible for providing power to the fans

CEHCO is a diode bridge assembly manufacturer. To discuss your specific requirements, please contact us toll free at (800) 595-7096, or send us an email at info@cehco.com.

Unregulated Transformer/Rectifier Assembly, 250 VDC, 300 AMP Output

Product Overview

CEHCO builds many unregulated Transformer/Rectifier assemblies. One such assembly is shown below. The 3 PH input is stepped down to 188 VAC L-L, to provide 250 VDC rectified output after the six diode assembly. Each diode is rated for 400 Amp and 1200 volts blocking voltage.

An Auto-Transformer is used instead of an Isolation Transformer to minimize the cost. The block diagram of the unregulated transformer/rectifier assembly is shown below:

The photo of the unregulated transformer/rectifier assembly, part number 18529PS is shown below:

Specifications:

• Unregulated Transformer/Rectifier assembly P/N 18529PS 
• Input 240 VAC, 3 PH, 60 Hz 
• Unregulated output 250 VDC, 300 Amp max 
• Indoor enclosure, 36”H x 28”W x 18”D 
• Input disconnect switch allows power ON/OFF 
• Voltmeter and Ammeter monitors output power 
• When power is turned on 2 fans turn on to force cool the rectifier assembly. 
• Input/output breaker or input fuse protection are not included.
• An Auto Transformer is used instead of an Isolation Transformer to minimize the cost

SCR Controlled Variable DC Power Supply, 0 to 42 VDC, 450 ADC Output

Product Overview

Variable DC power supplies are AC to DC power supplies with a variable DC output. The output can be varied with an SCR controller. The AC input power can be single phase or three phases. With single phase AC input, the DC output ripple is very high (50%). With three phase AC input, the DC output ripple is low (5%). This would be a key benefit for selecting three phase AC input instead of single phase.

The block diagram of the SCR controlled variable DC power supply, part number 18567PS is shown below:

The photo of the SCR controlled variable DC power supply, part number 18567PS is shown below:

Specifications:

• SCR Controlled Variable DC Power Supply, P/N 18567PS
• Input: 415 VAC, 3 PH, 50 Hz.
• Output: 0 to 42 VDC ± 10%, 450 Amps max.
• 120 VAC control transformer is included.
• SCR control is phase sensitive. Hence, 3 PH monitor is included.
• Fuses for the control transformer are included.
• Input contactor and overload relay are included.
• ON/ OFF push button capability is included.
• Emergency Power off (EPO) is included.
• Voltage control potentiometer and Current limit potentiometer are included.
• All input and output connections inside the enclosure.
• Since it is an SCR controlled output, ripple increases as output is lowered from the max.

Motorized Variable Transformer Controlled Power Supply

Product Overview

Variable DC power supplies are AC to DC power supplies with a variable DC output. The output can be varied with a Variable Transformer (also known as variac). The Variable Transformer can be adjusted manually or with a motorized control. The AC input power can be single phase or three phases. With single phase AC input, the DC output ripple is very high (50%). With three phase AC input, the DC output ripple is low (5%). This would be a key benefit for selecting three phase AC input instead of single phase.

The block diagram of the motorized variable transformer controlled power supply, part number 18534PS is shown below:

The photo of the variable DC power supply, part number 18534PS is shown below:

AC to DC Power Supply

Specifications:

• Motorized Variable Transformer Controlled Power Supply, P/N 18534PS
• Input: 460 VAC, 3 PH, 60 Hz
• Output: 0 to 250 VDC, 200 Amp max.
• Variable Transformer is used to vary the output. SCR controller is not used, as it generates harmonics.
• Input control is 0 to 3.6 VDC.
• Indoor enclosure: 50"H x 46"W x 36"D
• Output voltage and current feedback as 4/20 mA for PLC interface.
• All input/output connections are inside the enclosure

CEHCO is a motorized variable transformer power supply manufacturer. To discuss your specific needs, please contact us toll free at (800) 595-7096, or send us an email at info@cehco.com.

NEMA 4X DC Rectifier, 50 VDC, 3000 A Output

Product Overview

Many applications require a DC rectifier with a NEMA 4X enclosure. The customer is responsible to bring the input/output wiring to the NEMA 4X enclosure without compromising the NEMA 4X capability. Since the DC rectifier is fully sealed inside the NEMA 4X enclosure without any airflow  the customer is responsible to provide adequate air flow inside the NEMA 4X enclosure without compromising the NEMA 4X capability.

The block diagram of the unit is shown below:

An example of a NEMA 4X DC rectifier, part number 18447N is shown below:

Specifications:

• NEMA 4X DC Rectifier, P/N 18447PS
• Input: 480 VAC, 3 PH
• Output: 0 to 50 VDC, 3000 Amps
• PLC controlled with Touch Screen Monitor
• EPO capability
• Three temperature sensors are used (connected to primary, secondary and core).
• NEMA 4X Enclosure: 72″H x 72″W x 42″D approximately
• Water tank and pump are not included

CEHCO is a NEMA 4X DC Rectifier Manufacturer. To discuss your specific needs, please contact us toll free at (800) 595-7096, or send us an email at info@cehco.com.

High Voltage SCR Controlled Power Supply, 0 to 2800 VDC, 50 A Output

Product Overview

High voltage SCR controlled power supplies consist of a SCR controller on the 480 VAC three phase input power lines. The three phase power transformer is used to step up the secondary voltage so that after rectification the desired high voltage DC output is achieved. Each diode in the rectifier circuit consists of multiple diodes in series to increase the overall peak inverse voltage (PIV) of the diodes. The high voltage rectifier section is enclosed inside a fiber glass plenum to offer high voltage protection. Circuit breakers, fuses, voltmeters and ammeters can be added per customer requirements.

The block diagram of the unit is shown below:

The photo of a 2800 VDC, 50 A output high voltage SCR controlled power supply, part number 18574PS is shown below:

High Voltage Power Supply

Specifications:

• High Voltage SCR Controlled Power Supply, P/N 18574PS
• Input: 480 VAC, 3 PH, 60 Hz,
• Output: 0 to 2800 VDC, 45 Amps
• SCR controlled
• Power section enclosed in a floor mount enclosure
• Control section is attached to the power enclosure as shown.
• Manual / PLC switch is provided to switch between Manual mode and PLC mode.
• Voltage control and current limit are provided with manual potentiometers.
• Voltage control and current limit can be adjusted in the 4/20 mA format.
• Output filter is not included.
• Ripple degrade as output is lowered.
• Voltmeter and Ammeter are provided to monitor output.
• START / STOP push button capability provided in the manual mode.
• START / STOP push button capability provided in the remote mode.
• E-Stop provided for emergency power shut off.
• Power on light
• Over temperature protection provided on the rectifier power module.
• With the Remote START / STOP and 4/20 mA interface, the unit is ideal for automatic operation.

CEHCO is a high voltage power supply manufacturer. To discuss your specific requirements, please contact us toll free at (800) 595-7096, or send us an email at info@cehco.com.

24 Diode Bridge Assembly Using 300 Amps Diode

Product Overview

CEHCO has considerable experience in building 3 Phase rectifier bridge assemblies. Shown below is a 24 diode bridge assembly using threaded stud diodes. Each diode is rated for 300 Amps. Four diodes are connected in parallel to increase the output current capability. Six localized fans are provided for forced cooling. Customer responsible for providing power to fans.

The photo of the unit, part number 12M-300A-600PIV-24D-6F-120:

Specifications:

• Twenty Four diode bridge assembly, P/N 12M-300A-600PIV-24D-6F-120
• Each diode is rated for 300 Amps and 600 PIV. Four diodes are connected in parallel
• Estimated dimension 18″H x 13.25″W x 24″L
• Weight: 120 lbs
• Six localized fans are provided for forced cooling.
• Customer responsible for providing power to fans.

CEHCO is a diode bridge assembly manufacturer. To discuss your specific requirements, please contact us toll free at (800) 595-7096, or send us an email at info@cehco.com.

PLC Controlled Power Supply for On-Site Sodium Hypochlorite Generator System

Product Overview:

CEHCO manufactures transformers, rectifiers (electrical rectifier) and electrochlorination power supplies for On-Site Sodium Hypochlorite Generator Systems. We also make electrolyzer cells and design / integrate / manufacture a complete On-Site Sodium Hypochlorite Generator System per customer requirements.

The block diagram of the unit is shown below:

The photo of the electrochlorination power supply, part number 18164PS for a customer in Malaysia is shown below:

Specifications:

• Electrochlorination Power Supply, P/N 18164PS
• Input: 380 / 400 / 415 VAC, 3 PH, 50 Hz
• Output: 0 to 100 VDC, 1820 Amps
• PLC control with touch screen monitor
• 4/20 mA input interface
• Enclosure: 70″H x 65″W x 50″D

CEHCO is a unregulated transformer rectifier assembly manufacturer. To discuss your specific needs, please contact us toll free at (800) 595-7096, or send us an email at info@cehco.com.

Electrochlorination Power Supply, 22.5 VDC, 130 ADC Output

Product Overview

This power supply was used in Onsite Sodium Hypochlorite Generator Systems. It had SCR controls. The power supply was redesigned as a Transformer / Rectifier assembly without SCR controls. We have provided additional taps on the transformer to compensate for the SCR capabilities. These unregulated Transformer / Rectifier assemblies are extremely popular for OEM and field applications where a certain DC output is required. CEHCO builds its own transformer and rectifier assemblies in house and it is very easy for us to integrate them together and provide a fast solution to our customers. 

The block diagram of the electrochlorination power supply is shown below:

The photo of the unit, part number 18582PS is shown below:

Specifications:

• Transformer rectifier assembly, 3 KW, P/N 18582PS 
• Input 240 VAC, 1 PH, 60 Hz
• Output 22.5 VDC fixed, 130 ADC
• Output ripple 50% 
• Current and voltage feedback to PLC 
• PLC on/off control. 
• SCR controlled power supply has been redesigned as a transformer rectifier assembly
• Voltmeter and ammeter are installed on the enclosure to monitor output.
• A Disconnect Switch is provided to allow 240 VAC to the unit

Six Diode Bridge Assembly Using 400 Amp Diodes

Product Overview

Bridge Rectifier (electrical rectifier) Assemblies are constructed by packaging diodes and/or SCR’s components with heat sink extrusions in a diode bridge circuit. A bridge rectifier power supply can be a four diode assembly or a six diode assembly. A six diode bridge assembly has significantly lower ripple content (5%) than a four diode bridge assembly (50%). These rectifiers can be diode assemblies, SCR assemblies (consisting of SCRs instead of diodes) or hybrid assemblies (consisting of SCRs and diodes). Review the bridge rectifier schematics below for more information.

CEHCO has considerable experience in building 6 Diode bridge (electrical rectifier) assemblies . Shown below is a six diode bridge assembly using 400 Amps diodes, part number 8M-400A-1200PIV-6D

Specifications:

• Six diode bridge assembly, P/N 8M-400A-1200PIV-6D
• Each diode is rated for 400 Amps and 1200 PIV
• Estimated dimension 8″H x 13.5″W x 10″D
• Forced cooling may be required

CEHCO is a diode bridge assembly manufacturer. To discuss your specific requirements, please contact us toll free at (800) 595-7096, or send us an email at info@cehco.com.

Non-Motorized Variable Transformer Controlled Power Supply, 0 to 15 VDC 200 A Output

Product Overview

Variable DC power supplies are AC to DC power supplies with a variable DC output. The output can be varied with a Variable Transformer (also known as variac). The Variable Transformer can be adjusted manually or with a motorized control. The AC input power can be single phase or three phases. With single phase AC input, the DC output ripple is very high (50%). With three phase AC input, the DC output ripple is low (5%). This would be a key benefit for selecting three phase AC input instead of single phase.

The block diagram of the Non-Motorized Variable Transformer Controlled Power Supply is shown below:

An example of a variable DC power supply using a variac, part number 18318PS is shown below:

Specifications:

• Non-Motorized Variable Transformer Controlled Power Supply, P/N 18318PS
• Input: 230 VAC, 3 PH, 60 HZ
• Output 1: 230 VAC, 1 PH, 60 Hz, for 1/2 H.P. Electrolyte Pump (Receptacle # 1)
• Output 2: 120 VAC, 1 PH, 60 Hz auxiliary power, 1 KVA (Receptacle # 2)
• Output 3: 230 VAC, 3 PH, 60 Hz, for 1 H.P. Spindle (Receptacle # 3)
• Output 4: 0 to 15 VDC, 200 amps max
• Input disconnect switch
• Emergency Stop
• Voltmeter and Ammeter for output monitor
• Wheels for portability
• Start/Stop Control with pilot light
• Full operation and maintenance manual provided

CEHCO is a Non-Motorized Variable Transformer Controlled Power Supply manufacturer. To discuss your specific requirements, please contact us toll free at (800) 595-7096, or send us an email at info@cehco.com.

Offshore Power Supply System

Product Overview

This unit is an Offshore Power Supply System for small submarine applications. This allows the submarine to use off shore power when it is at various ports around the world. The offshore power could be anywhere between 190 VAC to 440 VAC, 1 PH, 50 or 60 Hz.

The block diagram of the Offshore Power Supply System is shown below:

The photos of the unit, part number 18333PS are shown below:

Specifications: 

• Unregulated Transformer Rectifier Assembly, P/N 18333PS
• Input: 190/208/220/380/416/440 VAC, 1 PH, 50/60 Hz 
• Output: 141 VDC, 80 Amps.
• Ripple: 50%.
• Input Disconnect Switch provided.
• Input 70 Amp fuse and output 100 Amp fuse provided.
• Enclosure: 20″ H x 20″ W x 12″ D with four caster wheels.
• Louvers added for free air cooling.

CEHCO is a unregulated transformer rectifier assembly manufacturer. To discuss your specific needs, please contact us toll free at (800) 595-7096, or send us an email at info@cehco.com.