• EHD/EHHD series
  • EHD/EHHD series

EHD/EHHD series

High Power DC Electronic Loads

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

  • Max Voltage: 150 V
  • Max Current: 150 A
  • Max Power: 1.5 kW
  • Four operation modes

High power 1500 W of Electronic Load is realized.

EHD series are best-fitted DC electronic loads to life tests for Primary batteries and/or secondary cells and DC power supplies and aging test and so on. High power of 1.5 times than conventional one is realized and this one unit can be applied to maximum 1500 W input. They are able to easily expand to 16 units, 24 kW (-LGob option models: Max. 32 units, 48 kW) and additional expansion is able as required according to number of cells. They are able to 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 speeding up CV response based on EHD series. They are best-fit to evaluation test of motors as it is able to 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 maaximum 24 kW (-LGob option model : Max. 48 kW) by the digital interface.
  • Low sink current at load off is realize.

Main 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

4 modes of Discharge

Constant Current (CC) Discharge

Constant Current (CC) Discharge graph

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 (CV) Discharge graph

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 (CR) Discharge graph

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 (CP) Discharge graph

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.

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.

Best fit to Evaluation Test of DC Motor for Cars

Best fit to Evaluation Test of DC Motor for Cars

Models

EHD series

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

EHHD series

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

An adapter is required separately, when using the Adapter. The following adapters are available according to the connection method between PC and sequencer.

CO-E32m: Adapter for LAN
Total 16 units can be connected to one CO-E32m.
LAN cable is not provided.
CO-E32
CO-U32m: Adapter for USB
Total 16 units can be connected to one CO-U32m.
USB cable is not provided.
CO-U32m
CO-MET2-9: Adapter for RS-232C (9 pin)
Total 16 units can be connected to each CO-MET2-9.
CO-MET2-9
CO-MET2-25: Adapter for RS-232C (25 pin)
Total 16 units can be connected to each CO-MET2-25.
CO-MET2-25
CO-MET4-25: Adapter for RS-485 (25 pin)
Total 16 units can be connected to each CO-MET4-25.
CO-MET4-25
CO-G32m: Adapter for GPIB
Total 16 units can be connected to one CO-G32m.
GPIB cable is not provided.
CO-G32

For details, refer to CO/USB series catalogue.

Digital interface
(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 PC, 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", lengh 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)

connect to a master unit and two slave units.

...up to 4 unit

Specifications

For details, download the datasheet below.

Options

Optical Interface Board *1

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.)

  • -LGob: Optica Interface Board + Optical cable, 2 m length
  • -LGob(Fc5): Optical Interface Board + Optical cable, 5 m length
  • -LGob(Fc10): Optical Interface Board + Optical cable, 10 m length
  • -LGob(Fc20): Optical Interface Board + Optical cable, 20 m length
  • -LGob(Fc40): Optical Interface Board + Optical cable, 40 m length

When use them under following environments, please select -LGob always.

  • Noisy environment including factories (Example: Motors or coils are used near to loads or power supplies)
  • Using with high voltage floating (more than 250 V)
  • The installation distance between power supply and controller (PL or PLC) produced by Matsusada Precision is more than two meters.

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)

Sold separately

Adapter for optical interface board connections

An adapter is required separately, when using the Adapter. The following adapters are available according to the connection method between PC and sequencer.

CO-E32: Adapter for LAN
Total 32 units can be connected to one CO-E32.
LAN cable is not provided.
CO-E32
USB-OPT: Adapter for USB
Total 32 units can be connected to one CO-U32.
USB cable is not provided.
CO-U32
CO-OPT2-9: Adapter for RS-232C (9 pin)
Total 32 units can be connected to each CO-OPT2-9.
CO-OPT2-9
CO-OPT2-25: Adapter for RS-232C (25 pin)
Total 32 units can be connected to each CO-OPT2-25.
CO-OPT2-25
CO-OPT4-25: Adapter for RS-485 (25 pin)
Total 32 units can be connected to each CO-OPT4-25.
CO-OPT4-25
CO-G32: Adapter for GPIB
Total 32 units can be connected to one CO-G32.
GPIB cable is not provided.
CO-G32

Connection method between PC and sequencer

(B) CO-opt 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
Model Power Input End Input Plug Cable length Dimension
(Core wire)
Outlet Shape Rated Voltage Rated Maximum
CABLE TYPE3 CABLE TYPE 3 Power Input End CABLE TYPE 3 Input Plug 6.35-inch/2.5 m 0.27-inch/6.8 mm (Free) 250 V 10 A
CABLE TYPE4 CABLE TYPE 4 Power Input End CABLE TYPE 4 Input Plug 6.35-inch/2.5 m 0.30-inch/7.5 mm Outlet Shape Type SEOutlet Shape Type SEOutlet Shape Type SE Type SE 250 V 10 A

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.

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