Discontinued
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 1500W 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. A high-density power of 1.5 times the 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-inch 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 a maximum of 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
It is discharged in the set current value. Even if the terminal voltage changes at discharging, the load current can flow to EHD constantly.
Constant Voltage (CV) Discharge
It is discharged in the set voltage value. Even if the terminal current changes at discharge, the operation voltage can be fixed.
Constant Resistance (CR) Discharge
It is discharged in the set resistance value. The terminal voltage is measured, and then the discharge current is determined according to the set resistance value.
Constant Power (CP) Discharge
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.
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
Insulation control is made with optical communication. As perfect insulation is made by optical fiber it is able to forestall miss operation as a 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
-
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)
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