Pulse drive is used in a control motor, for example, so reflected waves resulting from impedance mismatching between the cable, motor, and control section are superimposed on the signal, resulting in surges which become high voltage noise surges.
Surges contain high voltage components that are at least twice the normal drive voltage, so it is possible that the insulation may break down, stop functioning, or deteriorate, for example. It is therefore necessary to take measures against noise generation.
This is the demonstration movie which shows the actual efficiency of the surge suppression by viewing the measured surge waveforms on an oscilloscope. An actual surge waveforms are generated at the inverter motor drive system and OKI's surge suppression cables effects the reduction on the surge generation.
Please click followings:
Item | Surge suppression wire | Motor drive wires | ||||
---|---|---|---|---|---|---|
Conductor | Classification | Special plated copper alloy | 2mm2 | 3.5mm2 | 5.5mm2 | 8mm2 |
Structure core wires/mm | 1/0.24 | 37/0.26 | 45/0.32 | 70/0.32 | 50/0.45 | |
Insulator | Color | Natural | Red, white, black, green | |||
O.D. standard mm | 0.81 | 3.4 | 4.1 | 5.1 | 6.1 | |
Shield | O.D. standard mm | 1.2 | — | |||
Sheath | Classification | — | Soft, oil resistant PVC | |||
Color | Black (OKI color symbol: K) | |||||
Thickness standard mm | 1.8 | 2.0 | 2.1 | 2.3 | ||
O.D. standard mm | Standard12.0 | Standard14.0 | Standard16.5 | Standard19.5 | ||
Completed product | Standard length m | 100 | ||||
Electrical characteristics (drive wires) | Conductor resistance Ω/Km max |
— | 10.4 | 5.65 | 3.63 | 2.57 |
Insulation resistance MΩ km | 1 min | 50 | 40 | 40 | 40 | |
Withstand voltage V-min | AC2500 | AC1500 | AC1500 | AC1500 | AC1500 | |
Surge generation voltage (400 VAC 3-phase) |
1000V max (Surge generation ratio 50% max) Measurement point: Between each of U, V, and W phases at the motor input terminals Drive conditions: Inverter input voltage: 480 VAC max (50Hz) Inverter carrier frequency ≤ 15 KHz Drive cable length 100m max |