High-performance vector frequency converters of the SPLC-NZ8400-1000G series are designed for controlling heavy-load three-phase electric motors 380 V with a power of up to 1000 kW, where overloads may occur, and high demands are placed on control quality. These frequency converters have higher microprocessor performance than the SPLC-AT20 series, allowing SPLC-NZ8000 to execute operations more quickly and thus provide sensorless vector control of rotation speed with a precision of ±0.5%. If necessary, the inverter can switch to simple scalar control mode U/f with less precision and "Pump" mode for working with more powerful engines but with less load (details below).
The SPLC-NZ8000 converter can also be equipped with a PG board (purchased separately). With it, you can connect an encoder sensor to the inverter to track the motor's rotation speed and rotor position. Vector control with feedback provides increased response speed and frequency control precision up to ±0.02%, allowing torque control with an accuracy of up to ±5% and working not only with asynchronous but also synchronous motors.
Table — Main Technical Parameters of Frequency Converters SPLC-NZ8400-1000G
| Input Voltage |
3ph 380 V
|
| Output Voltage |
3ph 380 V
|
| Output Power |
up to 1200 kW
|
| Output Frequency Range |
from 0.1 to 3200.0 Hz (V/f) |
| Rated Input Current |
1800 A
|
| Rated Output Current |
1720 A
|
| Protection Degree EN 60529 |
IP20 |
When installing a frequency converter in a protective cabinet, its control panel (operator panel) can be detached and brought to the front panel. For this, a cable connector must be purchased.
Technical Specifications of the SPLC-NZ8000 Series
Standard Functions of the SPLC-NZ8400 Frequency Converter
| Control Modes |
Sensorless Vector Control (SFVC)
Vector Control in Closed Loop (CLVC, with PG)
Voltage-Frequency (V/F) Control |
| Maximum Output Frequency |
Vector Control: 0-320 Hz
V/F Control: 0-3200 Hz
|
| Carrier Frequency |
1-16 kHz
The carrier frequency is automatically adjusted based on the load characteristics. |
| Frequency Setting Resolution |
Digital setting: 0.01 Hz
Analog setting: maximum frequency × 0.025% |
| Starting Torque |
Type G: 0.5 Hz/150% (SFVC); 0 Hz/180% (CLVC, with PG)
Type: 0.5 Hz/100% |
| Speed Range |
1:100 (SFVC)
1:1000 (CLVC)
|
| Speed Accuracy |
±0.5% (SFVC), ± 0.02% (CLVC, with PG)
|
| Torque Control Accuracy |
±5% (CLVC, with PG) |
| Overload Capability |
G type: 60 s at 150% of rated current, 3 s at 180% of rated current
P type: 60 s at 120% of rated current, 3 s at 150% of rated current |
| Torque Boost |
Auto boost
Manual boost 0.1%-30.0%
|
| V/F Curve |
Linear V/F curve
Multi-point V/F curve
Step V/F curve (1.2, 1.4, 1.6, 1.8, quadratic) |
| V/F Division |
Two types: full division, partial division |
| Acceleration/Deceleration Mode |
Linear curve
S-shaped curve
Four groups of acceleration/deceleration time in the range 0.0-6500.0 s
|
| DC Braking |
DC braking frequency: from 0.00 Hz to maximum frequency
Braking time: 0.0-100.0 s
Selection of braking current action: 0.0% -100.0%
|
| JOG Control |
JOG frequency range: 0.00-50.00 Hz
JOG acceleration/braking time: 0.0-6500.0 s
|
| Built-in Multiple Preset Speeds |
Implement up to 16 speeds via simple PLC function or terminal state combination |
| Built-in PID |
Enables PID regulation of the closed-loop system |
| Automatic Voltage Tuning |
Can provide constant output voltage when the main voltage changes. |
| Overcurrent and Overvoltage Control |
Automatically limits current and voltage during operation to prevent frequent trips due to overcurrent or overvoltage. |
After enabling simple scalar control, SPLC-NZ8400-1000G converters operate in "General" load mode:
-
General — a general industrial mode for motors that work with approximately the same torque at different speeds (compressors, conveyors, lifts). In this mode, the frequency converter can deliver a starting torque over 150% for acceleration to overcome friction and inertia forces.
Individual Functions of SPLC-NZ8400
| Support for Different PG Boards |
Supports PG boards for rotating transformer, differential input, UVW differential input, resolver, and open collector input |
| Operation During Power Drop |
Voltage drop is compensated by load feedback energy, enabling the drive to continue operating briefly. |
| Nominal Current Limitation |
Avoids drive frequency faults due to overcurrent. |
| High Performance |
Control of asynchronous and synchronous motors is achieved using high-performance current vector technology. |
| Time Control |
Time range: 0.0-6500.0 min |
| Communication Method |
Modbus (standard)
Profibus-DP (optional)
CANlink (optional)
CAN (optional) |
| Protection Modes |
Detection of motor short circuit at startup, protection against incoming or outgoing phase loss, overcurrent, overvoltage, undervoltage, overheating, and overload. |
Principal Diagram of the SPLC-NZ8400-1000G Inverter
SPLC-NZ8000 features multifunctional input-output control terminals, which can be assigned independently in settings — to set the desired frequency, issue forward motion command, stop, etc.:
- Inputs: 8 discrete inputs (one high-speed pulse), 2 analog inputs (one 0...10 V or 0...20 mA, the second only for +10...-10 V;
- Outputs: 1 discrete transistor output (high-speed), 2 relays 250 VAC 3 A or 30 VDC 1 A, 2 analog outputs (0...10 or 0...20 mA).
By default, the frequency converter supports the most common communication port in Ukrainian enterprises RS-485, but on request, these frequency inverters can be supplied with a Profibus or CAN data transmission board, allowing easy integration of the equipment into any modern industrial network.
On order
