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  • EW series | DC Electronic Loads | Matsusada Precision
  • EW series | DC Electronic Loads | Matsusada Precision

High Power DC Electronic Load

  • Rated Voltage: 150 V
  • Rated Current: 480 A
  • Rated Power: 2400 W
  • Multiple operating mode

Space-saving, High-power (2400W in 3U)

EW series is a DC electronic load in the space-saving. The DC load offers four operating mode: CC, CR, CP, and CV. Switching mode and VI mode are available.

Features and Benefits

  • Four operating modes: Constant Current (CC), Constant Resistance (CR), Constant Power (CP), Constant Voltage (CV)
  • Multi group displays of current, voltage, and power on the large LCD screen
  • Greater load power and less space
  • Wide variety of testing applications with the switching mode and programmable function
  • Expandable up to five units (12 kW) with booster

Main Applications

  • Evaluation of DC switching power supply
  • For the absorption of surge current flowing into brushless DC motor
  • Evaluation of DC relay and DC switches
  • Evaluation of in-vehicle DC/DC converter
  • Discharge test of a high current rechargeable battery and Electric double-layer capacitor
  • I-V characteristic test of solar cells

Models

EW series
Models Rated voltage Rated current Rated power
EW150V-2400W 150 V 480 A 2400 W
Booster
Models Rated voltage Rated current Rated power
EW150V-2400WB 150 V 480 A 2400 W

* Independent operation of booster is not allowed.

Functions

High-power load 1.6 times higher than conventional models

1.5kW in the previous model
1.5kW in the previous model | DC Electronic Loads | Matsusada Precision
2.4kW
2.4kW model | DC Electronic Loads | Matsusada Precision

Four multiple operating modes

Constant Current (CC) Discharge

Constant Current (CC) Discharge graph| DC Electronic Loads | Matsusada Precision

A set current is discharged. Even if the terminal voltage changes during discharge, a constant current can flow.

Constant Resistance (CR) Discharge

Constant Resistance (CR) Discharge graph| DC Electronic Loads | Matsusada Precision

A set resistance is used to discharge. The discharge current value is determined according to the set value by measuring the terminal voltage value.

Constant Power (CP) Discharge

Constant Power (CP) Discharge graph| DC Electronic Loads | Matsusada Precision

A set power value is used to discharge. If the terminal voltage changes during discharge, a certain amount of power can be consumed according to the change.

Constant Voltage (CV) Discharge

Constant Voltage (CV) Discharge graph| DC Electronic Loads | Matsusada Precision

A set voltage value is used to discharge. Even if the terminal current changes during discharge, it can be operated at a constant voltage.

Auto switching between operating modes

With the auto switching, the operating mode where the load current is minimized is automatically set in response to the set value. The individual function of CC+CV mode, CR+CV mode, and CP+CV mode using the auto switching remains as it is.

Auto switching image between operating modes| DC Electronic Loads | Matsusada Precision

Switching mode

The mode enables to switch periodically between two values.
It is available for CC mode, CR mode, CP mode, and CV mode.

  • Slew rate (in CC mode, Range H)
    30 A/μs to 1 mA/μs
    Setting resolution 1 mA/μs
  • Frequency
    0.1 Hz to 20 kHz Setting resolution 0.1 Hz
  • Duty cycle
    0 to 100% Setting resolution 0.1%

* at 10 V or more and at 100 A or more, with no voltage drop due to wiring

The graph between Cycle (frequency) and Duty cycle

Sequence function

  • Current/Voltage/Power/Resistance setting value of each program
    (Available for the mode where the load current is minimized)
  • Step setting time 10 us to 1000 h
  • The setting is available for up to 1,024 steps of 10 programs.
  • Repetition frequency: infinite, or 1 time to 10000 times

The sequence function offers setting of step time, amplitude, ramp, and along with end of sequence, so you can create programs on the front panel.

The waveform pattern of sequence function| DC Electronic Loads | Matsusada Precision

VI Curve mode

It is possible to register up to 128 by combining the voltage value with the current ones. The mode provides a simulation of loads such as laser diodes and LEDs which have non-linear resistance characteristics.

The waveform pattern of sequence function| DC Electronic Loads | Matsusada Precision

Short function

Easily transfers to a low impedance state.

  • CC/CP mode: Maximum
  • CR mode: Maximum conductance
Short function | EW series | DC Electronic Loads | Matsusada Precision
When the Short function is enabled, the status signal will be output in the external control terminal. With interlocking with the external relay, you can have a condition similar to the actual short circuit.

Soft start/stop

Allows slow rise/fall of the current at load-on/off. It is desirable to match the ride time on the power supply to reduce the occurrence of the current overshoot.

  • Time: 10 μs to 500 ms
  • Rising waveform: linear/saturation curve
  • Minimum operating voltage: 0.05 V
Soft start/stop | EW series | DC Electronic Loads | Matsusada Precision

Timer setting

Available the time settings that automatically turn the load off in a certain period from the load on.

  • Setting time: 1 second to 10000 hours
Timer setting | EW series | DC Electronic Loads | Matsusada Precision

Input/Output of sequence program

Reads and writes sequence programs using USB memory.
Spreadsheet software is available for files in CSV format.

Data logging function

Recoeds the measurement values of current and voltage with USB memory at regular intervals.

  • Interval: 0.1 s to 300 s
Input/Output of sequence program / Data logging function | EW series | DC Electronic Loads | Matsusada Precision

Parallel operation mode

Up to five EW series electronic loads can be combined to operate as a single device.
The primary unit shows the summed set value and the monitored value.
The capacity can be increased to 12 kW by combining four boosters with EW150V-2400W.
EW-MS cables or commercially available LAN cables can be used for connection.

Parallel operation mode | EW series | DC Electronic Loads | Matsusada Precision

Specifications

For details, download the datasheet below.

Options

-LGob

Optical Interface Board

Isolation control is performed by optical communication. As complete isolation is performed by means of optical fiber, this enables advance prevention of erroneous operation comprising transient phenomena resulting from surges, inductive lightning, external noise, etc.

(The standard interface is not included in the option.)

  • -LGob: Optical interface board + optical cable 2 meters
  • -LGob(Fc5): Optical interface board + optical cable 5 meters
  • -LGob(Fc10): Optical interface board + optical cable 10 meters
  • -LGob(Fc20): Optical interface board + optical cable 20 meters
  • -LGob(Fc40): Optical interface board + optical cable 40 meters

Select the optional optical interface board (-LGob) when using this DC Electronic Load under the following conditions.

  • Noisy environment including factories (Example: motors or coils are used near power supplies and loads).
  • Using with high voltage floating (more than 250 V).
  • Installation distance of 2 meters or more between this DC Electronic Load and a controller such as a computer, laptop, or Programmable Logic Controller (PLC).

Adapters for connecting optical interface board (Sold separately)

To use the optical interface, you need to prepare an optical interface adapter separately. The following interface adapters are available according to the communication method of your controller port.

CO-E32: Adapter for LAN
Total 32 units can be connected to one CO-E32.
LAN cable is not provided.
USB-OPT: Adapter for USB
Total 32 units can be connected to one USB-OPT.
USB cable is not provided.
CO-OPT2-9: Adapter for RS-232C (9 pin)
Total 32 units can be connected to one CO-OPT2-9.
CO-OPT2-25: Adapter for RS-232C (25 pin)
Total 32 units can be connected to one CO-OPT2-25.
CO-OPT4-25: Adapter for RS-485 (25 pin)
Total 32 units can be connected to one CO-OPT4-25.
CO-G32: Adapter for GPIB
Total 32 units can be connected to one CO-G32.
GPIB cable is not provided.

USB Interface Board

(A) Optical fiber cable

Regarding the adapter for connecting optical interface board, more information is available in "CO/USB series Digital interface converter".

How to Order

When ordering, add Option No. to Model No. in alphabetical order followed by the input voltage.
Example:EW150V-2400W-LGob(Fc20)

Accessories

EW-MS cable 1 meter

Dedicated cable for controlling booster
The cable is used for the primary unit controlling the boosters (replicas).
The cable is required for one booster. You can substitute it with a commercially-available LAN cable.

AC input cable
Sold separately CABLE TYPE3 CABLE series | AC input cable | Matsusada Precision CABLE series | AC input cable | Matsusada Precision 250 V / 10 A 2.5 meters

Fixed length

Sold separately CABLE TYPE4 CABLE series | AC input cable | Matsusada Precision CABLE series | AC input cable | Matsusada Precision 250 V / 10 A 2.5 meters

Fixed length

How to Order

To order, please specify the model No.
Example: EW-MS cable, CABLE TYPE 3

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