Noker Ac Drives 10kV 1000kW Medium Voltage Vfd Motor Soft Starters
Medium voltage motor soft starter is the new type ac motor start device to replace the conventional star-delta starter, self-coupling voltage-drop starter and magnetic control voltage-drop starter. The start current can be lower than about 3 times rated current and could start repeatedly and continuously.
The current transformer detects three-phase current and is used for current limiting and protection. Voltage transformer detects three-phase voltage. It is used for triggered phase detection and voltage protection for overvoltage and undervoltage. The MCU controller controls the thyristor for phase Angle trigger control, simultaneously reduces the voltage on the motor, limits the starting current, and smoothly starts the motor until the motor runs at full speed. After the motor is running at full speed, switch to the bypass contactor. The medium voltage motor soft starter continues to detect the parameters of the motor to protect the motor. The high voltage motor soft starter can reduce the inrush current of the motor and reduce the impact on the power grid and the motor itself. At the same time, it also reduces the mechanical impact on the motor loading device, prolongs the service life of the device and reduces the failure of the motor. The keyboard&display module display all the parameters and status data of the motor soft starter.
1. Free of maintenance: Thyristor is an electric device without contacts. Different from other kinds of products that need frequent maintenance on liquid and parts etc., it turns the mechanical lift into the service life of electronic components, so it needs no maintenance after running for many years.
2. Easy installation and operation: Medium voltage motor soft starter complete system for controlling and protecting the starting of motor. It can put into operation only with the power line and motor line connected. The whole system can be tested electrically under low voltage before operating with high voltage.
3. Backup: The starter comes equipped with a vacuum contactor which can be used to start the motor directly in the inside.If fails, the vacuum contactor can be used to start the motor directly to ensure the continuity of the production.
4. Medium voltage motor soft starter comes equipped with an electromagnetic blocking device for fear of entering the high voltage device in the electrified state.
5. Advanced optical fiber transmission technique realizes the triggering detection of high voltage thyristor and the isolation between LV control loops.
6. DSP microcontroller is used to perform central control which is real-time and high efficient with high reliability and excellent stability.
7. LCD/touch screen display system in both Chinese and English with human-friendly operation interface.
8. RS-485 communication port can be used to communicate with the upper computer or centralized control center.
9. Aging experiments are made on all circuit boards
| Basic parameters | |
| Type of load | Three phase squirrel cage asynchronous and synchronous motors |
| AC voltage | 3kv, 6kv, 10kv, 11kv |
| Power frequency | 50/60hz±2hz |
| Phase sequence | Allowed to work with any phase sequence |
| Bypass contactor | Built-in bypass contactor |
| Control power supply | AC220V±15% |
| Transient over voltage | Dv/dt snubber network |
| Ambient condition | Ambient temperature: -20°C -+50°C |
| Relative humidity: 5%----95% no condensation | |
| Altitude less than 1500m (derating when altitude ismore than 1500m) | |
| Protection function | |
| Phase lose protection | If any phase of the input three-phase power supply is missing, the system will alarm and stop. |
| Over-current protection | During bypass operation, if the measured operating current exceeds the overcurrent setting value, the system will trigger alarm and stop within the set period. |
| Module overheating | The system will trigger alarm and stop if the temperature of the driving modules is greater than 85 degree as detected by the fiber optic. |
| Start-up timeout | During the motor start-up process, if the motor fails to accelerate to full speed within the start-up timeout limit, the system will trigger alarm and stop. |
| Unbalanced current | If the motor imbalance current exceeds the set value, the system will trigger alarm and stip within the set period. |
| Overload protection | When the operating current reaches the level set for overload protection, the system will trigger alarm and stop. |
| Over-voltage protection | If the detected grid voltage of the input three-phase power supply exceeds the overvoltage protection set value, the system will trigger alarm and stop within the set period. |
| Under-voltage protection | If the input three phase power supply's grid voltage falls below the underoltage protection set value, the system will trigger alarm and stop within the set period. |
| Short circuit protection | If the measured current exceeds the set value of short circuit overcurrent, the system will trigger alarm and stop within the set period. |
| Output phase loss protection | If there is a phase loss at the output end connected to the motor, the system will trigger alarm and stop. |
| Leakage protection | If the zero-sequence current exceeds the set value, the system will trigger the alarm and stop within the set period. |
| Over frequency protection | When the start-up frequency eceeds the set time limit within a short period. |
| Communication | |
| Protocol | Modbus RTU |
| Interface | RS485 |
| Model | Voltage level | Rated current | Dimensions of the cabinet | |||
| (kV) | (A) | H(mm) | W(mm) | D(mm) | ||
| NMV-500-3 | 3 | 113 | 2300 | 800 | 1500 | |
| NMV-900-3 | 3 | 204 | 2300 | 800 | 1500 | |
| NMV-1250-3 | 3 | 283 | 2300 | 1200 | 1500 | |
| NMV-1800-3 | 3 | 408 | 2300 | 1500 | 1500 | |
| NMV-2000-3 | 3 | 453 | 2300 | 1500 | 1500 | |
| NMV-2000-3 and above | 3 | ＞450 | To be ordered | |||
| NMV-500-6 | 6 | 57 | 2300 | 800 | 1500 | |
| NMV-1000-6 | 6 | 113 | 2300 | 800 | 1500 | |
| NMV-1500-6 | 6 | 170 | 2300 | 800 | 1500 | |
| NMV-2000-6 | 6 | 226 | 2300 | 800 | 1500 | |
| NMV-2500-6 | 6 | 283 | 2300 | 1200 | 1500 | |
| NMV-3000-6 | 6 | 340 | 2300 | 1200 | 1500 | |
| NMV-3500-6 | 6 | 396 | 2300 | 1500 | 1500 | |
| NMV-4000-6 | 6 | 453 | 2300 | 1500 | 1500 | |
| NMV-4000-6 and above | 6 | ＞450 | To be ordered | |||
| NMV-500-10 | 10 | 34 | 2300 | 800 | 1500 | |
| NMV-1000-10 | 10 | 68 | 2300 | 800 | 1500 | |
| NMV-1500-10 | 10 | 102 | 2300 | 800 | 1500 | |
| NMV-2000-10 | 10 | 136 | 2300 | 800 | 1500 | |
| NMV-2500-10 | 10 | 170 | 2300 | 800 | 1500 | |
| NMV-3000-10 | 10 | 204 | 2300 | 1200 | 1500 | |
| NMV-3500-10 | 10 | 238 | 2300 | 1200 | 1500 | |
| NMV-4000-10 | 10 | 272 | 2300 | 1200 | 1500 | |
| NMV-5000-10 | 10 | 340 | 2300 | 1500 | 1500 | |
| NMV-6000-10 | 10 | 408 | 2300 | 1500 | 1500 | |
| NMV-6000-10 and above | 10 | ＞450 | To be ordered | |||
In order to better understand your needs, Before you order the medium voltage motor soft starter, you need offer some more informations for us to confirm.
1. Motor parameters
2. Load parameters
3. Power supply parameters
4. Other parameters
1. ODM/OEM service is offered.
2. Quick order confirmation.
3. Fast delivery time.
4. Convenient payment term.
At present, the company is vigorously expanding overseas markets and global layout. We are committed to becoming one of the top ten export enterprises in China’s electrical automatic product, serving the world with high-quality products and achieving a win-win situation with more customers.
