DC Electronic Loads

High Power DC Electronic Loads

The compact size has achieved 1.5 times the load of the existing model.

Voltage range: 1.5V to 150V
Rated current: 150A
Rated power: 1000W, 1500W
Four operation modes

High power 1500 W of Electronic Load is Realized.

EHD series is best-fitted DC electronic loads to life tests for primary cells and the secondary cell (rechargeable battery) and DC power supplies and aging tests, and so on. High-density power of 1.5 times than conventional one is realized, and this one unit can be applied to a maximum of 1500 W input. They can expand to 16 units easily, 24 kW (-LGob option models: Max. 32 units, 48 kW), and additional expansion is able as required according to several cells. They can configure systems with our DC power supplies REK series or RK series and so on with LAN, USB, RS-232C/RS-485, or GPIB interface.

EHHD series are models made to speed up CV response based on the EHD series. They are the best fit for the evaluation test of motors as they can protect peripheral equipment by sinking smoothly current regenerated by the motor.

Features

Maximum 1500 W of load power is realized in the same size of a 19 inches rack of 3U size.
They are operable in 4 modes of Constant Voltage (CV), Constant Current (CC),
Constant Resistance (CR), and Constant Power (CP).
It is possible to control up to maximum 24 kW (-LGob option models: Max. 48 kW) by the digital interface.
Low sink current at load off is realized.
The model made speeding up CV response is available.

4 modes of Discharge

Constant Current (CC) Discharge

Constant Current| EHD/EHHD series | DC Electronic Loads | Matsusada Precision

It is discharged in the set current value. Even if the terminal voltage changes at discharging, output current can flow to EHD constantly.

Constant Voltage (CV) Discharge

Constant Voltage| EHD/EHHD series | DC Electronic Loads | Matsusada Precision

It is discharged in the set voltage value. Even if the terminal current changes at discharging, operation voltage can be fixed.

Constant Resistance (CR) Discharge

Constant Resistance| EHD/EHHD series | DC Electronic Loads | Matsusada Precision

It is discharged in the set resistance value. The terminal voltage is measured, and then discharge current is determined according to the set resistance value.

Constant Power (CP) Discharge

Constant Power| EHD/EHHD series | DC Electronic Loads | Matsusada Precision

It is discharged in the set at the power value. If the terminal voltage changes at discharging, it is possible to set off consuming the constant power according to the change of terminal voltage.

Applications

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

These Applications are Available, for Example

Best fit to Evaluation Test of DC Motor for Cars

It is able to evaluate motors without damages on ECU and the power supply by sinking current regenerated by the motor with EHD/EHHD series in combination with our DC power supply REK series, etc.

Evaluation Test of DC Motor for Cars| EHD/EHHD series | DC Electronic Loads | Matsusada Precision

Models

EHD series

Model	Rated
Model	Voltage	Current	Power
EHD1k-150V	150 V	150 A	1000 W
EHD1.5k-150V	150 V	150 A	1500 W

EHHD series

Model	Rated			Response time at CV mode ^*1
Model	Power	Voltage	Current	Response time at CV mode ^*1
EHHD1k-150V	150 V	150 A	1000 W	≤10ms ^*2
EHHD1.5k-150V	150 V	150 A	1500 W	≤10ms ^*2

Time form current beginning to flow after the input voltage was beyond a set point. (Time until actual input voltage is stabilized is affected with testing power supply and impedance of wiring.)
When the potential difference of input voltage and setting voltage is more than 3 V. (When it is operated alone)

Functions

Digital Interface

Digital control via USB, LAN, RS-232C and RS-485 is possible. It is applicable as one electronic load of high power by hooking maximum 16 units (24 kW) of EHD/EHHD.

Adapters (sold separately)

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

CO-E32m: Adapter for LAN: Total 16 units can be connected to one CO-E32m.; LAN cable is not provided.

CO-U32m: Adapter for USB: Total 16 units can be connected to one CO-U32m.; USB cable is not provided.

CO-MET2-9: Adapter for RS-232C (9 pin): Total 16 units can be connected to each CO-MET2-9.

CO-MET2-25: Adapter for RS-232C (25 pin): Total 16 units can be connected to each CO-MET2-25.

CO-MET4-25: Adapter for RS-485 (25 pin): Total 16 units can be connected to each CO-MET4-25.

CO-G32m: Adapter for GPIB: Total 16 units can be connected to one CO-G32m.; GPIB cable is not provided.

For details, refer to CO/USB series datasheet.

(A) CO-M cable: A two-meter cable is provided in each unit without interface option. If you need a longer cable, please consult with our sales staff.

In case that it is presumed to be utilized under any particular environment, option -LGob (optical interface) is required.
In order to high power without computer, please utilize the master-slave control shown as the right illustration.

Master/Slave

By using the dedicated cable for Master-slave Control "EHD-MS cable", length of 0.55 m, sold separately), it is able to control maximum 4 slave unites with one master unit.

(B) EHD-MS cable (Sold separately)

Specifications

For details, download the datasheet below.

Options

-LGob ^*1

Optical Interface Board

Insulation control is made with optical communication. As perfect insulation is made by optical fiber it is able to forestall miss operation as transient phenomenon caused by surge, dielectric thunder or foreign noise, etc.
(The standard interface is not included in the option.)

To use the optical interface, you need to prepare an optical interface adapter separately.
For details, click here.

-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).

How to Order

When ordering, add Option No. to Model No. in alphabetical order followed by the input voltage.
Example: EHD1.5k-150V-LGob(Fc20)

Accessories(Sold separately)

Adapter for optical interface board connections

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 CO-U32.; USB cable is not provided.

CO-OPT2-9: Adapter for RS-232C (9 pin): Total 32 units can be connected to each CO-OPT2-9.

CO-OPT2-25: Adapter for RS-232C (25 pin): Total 32 units can be connected to each CO-OPT2-25.

CO-OPT4-25: Adapter for RS-485 (25 pin): Total 32 units can be connected to each CO-OPT4-25.

CO-G32: Adapter for GPIB: Total 32 units can be connected to one CO-G32.; GPIB cable is not provided.

Adapters for connecting optical interface

(B) Optical fiber cable

As for the option, digital interface is not attached. For more information on the digital interface, refer to CO/USB series datasheet.

Dedicated cable for the master/slave control

EHD-MS cable

The cable is required for each slave unit.

AC input cable

Standard	CABLE TYPE1	125 V / 10 A	2.5 meters Fixed length
Sold separately	CABLE TYPE3	250 V / 10 A	2.5 meters Fixed length
Sold separately	CABLE TYPE4	250 V / 10 A	2.5 meters Fixed length

How to Order

To order, please specify the model No.
Example:EHD-MS cable, ET-32, CABLE TYPE 3

Dimensions

For details, download the datasheet below.

Download

: EHD/EHHD series Datasheet

Date: 2022-10-28 rev.08
PDF (5,790 KB)

Download

: How to Use DC Power Supplies

Date: 2022-03-18 rev. 04
PDF (1,487 KB)

Download

: DC Electronic Load Selection Guide

Date: 2023-02-17 rev. 00
PDF (6,812 KB)

Download

The account registration is necessary for downloading

: EHD/EHHD series Datasheet

Date: 2022-10-28 rev.08
PDF (5,790 KB)

: How to Use DC Power Supplies

Date: 2022-03-18 rev. 04
PDF (1,487 KB)

: DC Electronic Load Selection Guide

Date: 2023-02-17 rev. 00
PDF (6,812 KB)

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