Speed Search General Purpose Inverter
The NH820 Series ultra-high power general-purpose vector VFD is engineered for stable driving and precise control of asynchronous motors under heavy-load conditions. It features robust built-in functions and dependable running performance, complying with major international standards and certification specifications. Adopting a dedicated DSP chip for motor control as the core control unit,…
The NH820 Series ultra-high power general-purpose vector VFD is engineered for stable driving and precise control of asynchronous motors under heavy-load conditions. It features robust built-in functions and dependable running performance, complying with major international standards and certification specifications.
Adopting a dedicated DSP chip for motor control as the core control unit, this inverter delivers high-performance and high-precision motor regulation. It supports flexible frequency source superposition and switching modes, advanced PID algorithms, 15-step multi-speed control, automatic program operation, wobble frequency control and speed tracking functions.
Tailored for demanding heavy-duty working scenarios, the 315–750kW variant is optimized for superior reliability and environmental adaptability. Combined with user-friendly operation and industry-focused design, it provides enhanced functional configurations, broader application flexibility and long-term stable operation.
It is widely suitable for large-scale papermaking, wire drawing, machine tools, textile, packaging and food processing industries. It also serves heavy-duty applications including large fans, water pumps and high-power automated production equipment.
- It can avoid over current faults caused by direct starting and achieve smooth starting
- When the demand for motor torque is low, the excitation current is reduced according to the load current
- Maximize the efficiency of the motor
- Reduce motor losses and energy consumption
- The three points of the curve can be adjusted
- There are three curve – setting methods: The linear curve is suitable for ordinary constant – torque loads. The multi – point curve is suitable for loads of dehydrators and centrifuges. The square – law curve is suitable for loads of fans and pumps.The three points of the curve can be adjusted
- The most suitable curve can be set according to the torque characteristics of the equipment to achieve better energy -saving results
- It can achieve smooth starting and avoid over – current faults caused by direct starting
- It is more suitable for the use of fans and pumps
| Item | Specification |
|---|---|
| Basic functions | Output frequency：0 – 500Hz |
| Carrier frequency：0.8kHz ~ 12kHz, the carrier frequency can be automatically adjusted according to the load characteristics | |
| Frequency resolution：0.01Hz | |
| Control mode：V/F control | |
| Torque characteristics：With torque compensation and slip compensation, starting torque: G – type machine 0.5Hz/150%, P – type machine 0.5Hz/100% |
|
| Torque boost：Automatic torque boost; Manual torque boost 0.1% ~ 30.0% | |
| Overload capacity：G – type machine: 150% of rated output current for 60S P – type machine: 130% of rated output current for 60S |
|
| Speed regulation range：1:100 | |
| Speed stability accuracy：±1% | |
| Automatic voltage regulation (AVR)：When the grid voltage changes, it can automatically maintain a constant output voltage | |
| Over – voltage and over – current stall control：Automatically limits the current and voltage during operation to prevent frequent over – current and over – voltage tripping | |
| Fast current – limiting function：Minimizes over – current faults to protect the normal operation of the frequency converter | |
| V/F curve：Four modes: linear type; multi – point type; complete V/f separation; incomplete V/f separation | |
| Acceleration and deceleration curves：Linear or S – curve acceleration and deceleration modes; four acceleration and deceleration times; acceleration and deceleration time range: 0.1 ~ 6500.0s | |
| DC braking：DC braking frequency: 0.00Hz ~ maximum frequency, braking time: 0.0s ~ 36.0s, braking action current value: 0.0% ~ 100.0% | |
| Simple PLC, multi – speed operation | |
| Jog control：Jog frequency range: 0.00Hz ~ 50Hz; jog acceleration and deceleration time: 0.0s ~ 6500.0s | |
| Up to 16 – speed operation can be achieved through the built – in PLC or control terminals | |
| Built – in PID：It can easily implement a process – control closed – loop control system | |
| Operating characteristics | Operating command channel：Three channels: given by the operation panel, given by the control terminals, given by the serial communication port. It can be switched in various ways |
| Frequency source：Ten frequency sources: given by panel knob, given by operation panel, given by analog voltage, given by analog current, given by RS485 communication, multi – speed, PID, simple PLC, which can be switched in various ways | |
| Auxiliary frequency source：Ten auxiliary frequency sources. It can flexibly achieve auxiliary frequency fine – tuning and frequency synthesis | |
| Display and keyboard operation | Input terminals：Six digital input terminals, one of which can be used as a high – speed pulse input. Two analog input channels, AI1: input range 0 ~ +10V, AI2: input range 0 ~ +10V/0 – 20mA |
| Output terminals：One high – speed pulse output terminal, outputting square – wave signals from 0kHz ~ 50kHz, which can realize the output of physical quantities such as set frequency and output frequency One digital output terminal One relay output terminal Two analog output terminals, AO2: 0V ~ 10V, AO1: 0V ~ 10V/0 – 20mA, which can indicate output frequency/current/voltage/frequency command/speed/power factor signal output |
|
| LED display：It is equipped with 8 function keys, a 5 – digit 7 – segment LED, and 5 status LED indicators. It can perform forward rotation, reverse rotation, reset, stop, jog, as well as parameter setting and display |
|
| Protection characteristics | Protection function：Motor short – circuit detection upon power – on, output phase – loss protection, over – current protection, over – voltage protection, under – voltage protection, over – heat protection, overload protection, etc |
| Environment | Application place：Indoors, not directly exposed to sunlight, free from dust, corrosive gases, flammable gases, oil mist, water vapor, dripping water or salt, etc |
| Altitude：Less than 1000m | |
| Ambient humidity：- 10℃ ~ + 40℃ (When the ambient temperature is between 40℃ ~ 50℃, derating operation is required) | |
| Humidity：Less than 95%RH, without water droplet condensation | |
| Vibration：Less than 5.9m/s² (0.6g) | |
| Storage temperature：- 20℃ ~ + 60℃ |
Installation dimensions of the keyboard base
Diagrams of the overall dimensions and installation dimensions of the plastic structure
| Applicable models | Rated output power (kW) | Input voltage | A (mm) | B (mm) | H (mm) | W (mm) | D (mm) | Installation aperture (mm) |
|---|---|---|---|---|---|---|---|---|
| 820/860S | 0.4~2.2 | Single‑phase 220V range: -15%~ +15% |
90 | 157 | 170 | 101 | 142 | Φ5 |
| 820/860S/860E | 0.75~2.2 | Three‑phase 380V range: -15%~ +15% |
90 | 157 | 170 | 101 | 142 | Φ5 |
| 820/860S/860E | 4~5.5 | 111 | 183 | 197 | 129 | 175 | Φ5 | |
| 820/860S/860E | 7.5 | 137 | 237 | 256 | 157 | 190 | Φ5 | |
| 820 | 11 | 137 | 237 | 256 | 157 | 190 | Φ5 | |
| 820 | 15~22 | 151 | 303 | 320 | 170 | 222 | Φ5.8 | |
| 820 | 30~37 | 205 | 366 | 380 | 218 | 235 | Φ6 |
Diagrams of the overall dimensions and installation dimensions of the sheet metal structure
| Applicable models | Rated output power (kW) | Input voltage | A (mm) | B (mm) | H (mm) | W (mm) | D (mm) | Installation aperture (mm) |
|---|---|---|---|---|---|---|---|---|
| 820/860S | 0.4~2.2 | Single‑phase 220V range: -15%~ +15% |
90 | 157 | 170 | 101 | 142 | Φ5 |
| 820/860S/860E | 0.75~2.2 | Three‑phase 380V range: -15%~ +15% |
90 | 157 | 170 | 101 | 142 | Φ5 |
| 820/860S/860E | 4~5.5 | 111 | 183 | 197 | 129 | 175 | Φ5 | |
| 820/860S/860E | 7.5 | 137 | 237 | 256 | 157 | 190 | Φ5 | |
| 820 | 11 | 137 | 237 | 256 | 157 | 190 | Φ5 | |
| 820 | 15~22 | 151 | 303 | 320 | 170 | 222 | Φ5.8 | |
| 820 | 30~37 | 205 | 366 | 380 | 218 | 235 | Φ6 |
| Applicable models | Machine type (kW) |
Overall dimensions | Installation dimensions | Installation hole diameter | |||
|---|---|---|---|---|---|---|---|
| H(mm) | W(mm) | D(mm) | H1(mm) | W1(mm) | mm | ||
| 820/860S/860E | 11‑15 | 340 | 204 | 214 | 325 | 150 | Φ6 |
| 820/860S/860E | 18.5‑22 | 360 | 224 | 214 | 345 | 150 | Φ6 |
| 820/860S/860E | 30‑37 | 380 | 262 | 220 | 360 | 192 | Φ9 |
| 820 | 45 new | 480 | 270 | 250 | 465 | 190 | Φ7 |
| 820 | 45‑75 | 450 | 330 | 259 | 430 | 240 | Φ9 |
| 860S/860E | 45‑75 | 570 | 380 | 263 | 547.5 | 240 | Φ10 |
| 860S/860E | 90‑132 | 610 | 400 | 286 | 587.5 | 240 | Φ12 |
| 860S/860E | 160‑220 | 760 | 500 | 355 | 735 | 200 | Φ12 |
| 860S/860E | 250‑400 | 862 | 750 | 455 | 832 | 250 | Φ12 |
| 820/860S | 450‑560 | 1122 | 950 | 505 | 1092 | 350 | Φ12 |
| 820/860S | 630‑750 | 1045 | 1050 | 505 | 1015 | 400 | Φ12 |
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