Discontinued
High Power DC Electronic Loads
Compact design delivering 1.5 times the power density of previous models.
- Voltage range: 1.5 V to 150 V
- Rated current: 150 A
- Rated power: 1000 W, 1500 W
- Four operation modes
High Power 1500W of Electronic Load is Realized
EHHD Series The EHHD series is optimized for faster CV (Constant Voltage) response. It is ideal for motor evaluation testing, effectively protecting peripheral equipment by smoothly sinking regenerative current from the motor.
FEATURES
- High Power Density: Delivers up to 1500 W in a compact 3U 19-inch rack-mount size.
- Four Operation Modes: Constant Voltage (CV), Constant Current (CC),
Constant Resistance (CR), and Constant Power (CP). - Scalability: Supports digital control of up to 24 kW (Standard) or 48 kW (with -LGob option).
- Optimized Performance: Low sink current when the load is off.
- Fast Response: High-speed CV response model available (EHHD series).
4 modes of Discharge
Constant Current (CC) Mode
Current flows at the set value. The EHD series maintains stable load current even if the terminal voltage fluctuates during discharge.
Constant Voltage (CV) Mode
Voltage is maintained at the set value. The operating voltage remains fixed even if the terminal current varies during discharge.
Constant Resistance (CR) Mode
Current flows according to the set resistance value. The system measures terminal voltage and automatically adjusts the discharge current to maintain the specified resistance.
Constant Power (CP) Mode
Power consumption is maintained at the set value. The load current is automatically adjusted in response to voltage changes to keep power dissipation constant.
APPLICATIONS
- Testing of DC switching power supply
- Testing of in-vehicle DC/DC converter
- Testing 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
- Testing of AC adapter
- Testing of DC relay and DC switches
- I-V characteristic test of solar cells
These Applications are Available, for Example
Best Fit to Test of Electric Power Steering System 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.
Models
EHD series
| Model | Rated | ||
|---|---|---|---|
| Voltage | Current | Power | |
| EHD1k-150V | 150 V | 150 A | 1000 W |
| EHD1.5k-150V | 1500 W | ||
EHHD series
| Model | Rated | Response time at CV mode *1 | ||
|---|---|---|---|---|
| Power | Voltage | Current | ||
| EHHD1k-150V | 150 V | 150 A | 1000 W | ≤10ms *2 |
| EHHD1.5k-150V | 1500 W | ≤10ms *2 | ||
- Time from current beginning to flow after the input voltage was beyond a set point. (Time until actual input voltage is stabilized is affected by testing power supply and impedance of wiring.)
- When the potential difference of input voltage and set 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 a maximum of 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
-
A total of 16 units can be connected to one CO-E32m.
LAN cable is not provided.
- CO-U32m: Adapter for USB
-
A total of 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)
-
A total of 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
-
A total of 16 units can be connected to one CO-G32m.
GPIB cable is not provided.
A two-meter cable is provided in each unit without an interface option.
If you need a longer cable, please consult with our sales staff.
- In case it is presumed to be utilized under any particular environment, option -LGob (optical interface) is required.
- In order to high power without a 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
Options
- -LGob *1
-
Optical Interface Board
This option provides isolated control via optical communication. By using optical fiber for perfect insulation, it prevents malfunctions caused by transient phenomena such as lightning surges or external noise.
(Note: Standard digital interface is not included with this 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
-
A total of 32 units can be connected to one CO-E32.
LAN cable is not provided.
- USB-OPT: Adapter for USB
-
A total of 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)
-
A total of 32 units can be connected to each CO-OPT4-25.
- CO-G32: Adapter for GPIB
-
A total of 32 units can be connected to one CO-G32.
GPIB cable is not provided.
As for the option, the 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.
| 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
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EHD/EHHD series Datasheet (Discontinued)
Date: 2023-10-03 rev.11
PDF (4,049 KB)
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-
EHD/EHHD series Datasheet (Discontinued)
Date: 2023-10-03 rev.11
PDF (4,049 KB)
On this website, we provide only the latest versions of information and instruction manuals for our products. Therefore, the newest versions of manuals on the website may differ from those that came with products you purchased in the past.
