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Invertor Hot Line Coil Resistance Meter
DAC-HRI-3N / DAC-HRI-3N TYPE 700
DAC-HRI-3N/DAC-HRI-3N TYPE 700 can measure COIL RESISTANCE IN THE OPERATING STATE.
The resistance of motor coils affects the temperature rise and energy loss.
Therefore, resistance testing on motor coils is important to ensure safety and to design energy efficient electrical equipment.
DAC-HRI-3N is designed to conduct temperature rising test of coils in inverter (PWM) driven equipment, such as EV (Electric Vehicle) motors, DC brushless motors, Heat pumps and compressors.
Knowing the actual temperature rising value in the coil windings during operation is very helpful for safety evaluation and minimizing energy loss in electrical equipment.
DAC-HRI-3N
(Test voltage Max AC450V)
DAC-HRI-3N TYPE 700
(Test voltage Max AC700V)
Until recently, the coil winding resistance is confirmed while the motor is stopped. This method assumes a natural logarithmic change in resistance after stop of operation, but complex products do not always follow this principal. In particular, the coils of motors with fans cool rapidly, and there can be a large different between the off-line value and the actual value.
To verify and ensure the safety of the product, it is ideal to measure the coil temperature while it is in operation state.
Accurate temperature rise test is possible with DAC-HRI-3N.
Application
Winding resistance measurement for
● EV Motor
● Brushless Motor
● Heat Pumps and Compressors for Air-Conditioner, Refrigerator and etc.
PC Software
Measurement Display (Graph)
Measurement Display (Table)
(3-phase data is available when DAC-HRI-3N is used with the option unit DAC-SCB-3.)
OPTION ITEMS
AUTO 3-PHASE SWITCHING BOX DAC-SCB-3
DAC-SCB-3 and software enable automatic switching of the measurement phase of a 3-phase motor.
DC CUT CAPACITOR BOX (C-MODEL)
FRONT VIEW (DAC-C45AXC23A-C)
DAC-C45AXC23A-C consists of 45A and 23A capacitors for single/three phase testing.
REAR VIEW (DAC-C45AXC23A-C)
The Hot-Line measurement requires appropriate capacitors to be inserted between the AC power source and the DUT to prevent the DC test current from flowing into the power line. For single/three phase testing up to 450A is available upon request.
Why is DC Cut Capacitor necessary?
Connection diagram for DAC-HRI-3N, DAC-SCB-3 and the capacitor box ("-C" model)
By using the 3-phase switching unit DAC-SCB-3 and software, continuous measurement is possible while automatically switching each phase (U-V, V-W, W-U) at optional interval time through PC.
Why is DC Cut Capacitor necessary?
Related standards
● JIS C4203 Single Phase induction motors
● JEC 2137 Induction motor
● IEC 60279 (Normative reference of IEC 60034-1), JIS C 4034-1 Measurement of the winding resistance of an A.C. machine during operation at alternating voltage.