High-performance vector frequency inverters of the series SPLC-NZ8400-450G/500P are designed to control high-load three-phase electric motors 380 V with a power of up to 450 kW, where overloads may occur, and high demands are placed on control quality. These frequency inverters have higher microprocessor performance than the SPLC-AT20 series, allowing SPLC-NZ8000 to perform operations faster and thus provide sensorless vector control of rotation speed with an accuracy of ±0.5%. If necessary, the inverter can switch to simple scalar control mode U/f with lower accuracy and "Pump" mode for working with more powerful motors but with lighter loads (details below).
The inverter SPLC-NZ8000 can also be equipped with an optional PG board (sold separately). With it, an encoder sensor can be connected to the inverter to monitor motor rotation speed and rotor position. Vector control with feedback offers increased response and accuracy of frequency control to ±0.02%, allows torque control with an accuracy of ±5% and can work not only with asynchronous but also synchronous motors.
Table — Main Technical Parameters of Inverters SPLC-NZ8400-450G/500P
| Input Voltage |
3ph 380 V
|
| Output Voltage |
3ph 380 V
|
| Output Power |
up to 450 kW (500 kW in "Pump" mode)
|
| Output Frequency Range |
from 0.1 to 3200.0 Hz (V/f) |
| Rated Input Current |
790 A (835 A in "Pump" mode)
|
| Rated Output Current |
790 A (860 A in "Pump" mode)
|
| Protection Level EN 60529 |
IP20 |
When a frequency inverter is installed in a protective cabinet, its control panel (operator panel) can be detached and placed on the front panel. A connector cable needs to be purchased for this purpose.
Technical Specifications of the SPLC-NZ8000 Series
Standard Functions of the SPLC-NZ8000 Frequency Inverter
| Control Modes |
Sensorless Vector Control (SFVC)
Closed-Loop Vector Control (CLVC, with PG)
Volt-Frequency (V/F) Control |
| Maximum Output Frequency |
Vector Control: 0-320 Hz
V/F Control: 0-3200 Hz
|
| Carrier Frequency |
1-16 kHz
Carrier frequency is automatically adjusted depending on the nature of the load. |
| Frequency 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 Capacity |
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 |
Automatic 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) |
| Division of V/F |
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
Choice of braking current action: 0.0% -100.0%
|
| JOG Control |
JOG frequency range: 0.00-50.00 Hz
JOG acceleration/deceleration time: 0.0-6500.0 s
|
| Built-in Multiple Preset Speeds |
Implementation of up to 16 speeds through simple PLC function or terminal state combination |
| Built-in PID |
Activation of closed-loop PID regulation |
| Automatic Voltage Adjustment |
Can maintain constant output voltage when main voltage changes. |
| Overcurrent and Overvoltage Control |
Automatically limits current and voltage during operation to prevent frequent tripping due to overcurrent or overvoltage. |
Enabling simple scalar control in SPLC-NZ8000 inverters makes it possible to select the load type "General" or "Pump" in the menu.
-
General — a general industrial mode for motors operating with approximately the same torque at different speeds (compressors, conveyors, lifts). In this mode, the frequency inverter can provide a starting torque of over 150% for acceleration, to overcome friction and inertia forces.
-
Pump — a specialized mode for fans, pumps, and other electric motors operating with torque that increases with rotation speed and when there is no need for a high starting torque.
Thus, the frequency inverter SPLC-NZ8400-450G/500P is designed for controlling motors up to 450 kW, but when switching to scalar control and "Pump" mode, it can control an electric motor up to 500 kW. At the same time, the permissible overload will decrease: if in the normal "General" mode, the load is allowed no more than 150% for 60 s or 180% for 3 s, then in "Pump" mode with a more powerful motor, these indicators are reduced — overloads of no more than 120% for 60 s or 150% for 3 s.
Individual Functions of SPLC-NZ8000
| Support for Various PG Boards |
Supports PG boards for rotating transformer, differential input, differential input UVW, resolver and open collector input |
| Power Loss Operation |
Voltage drop is compensated by reverse load feedback energy, allowing the drive to continue operation for a short time. |
| Rated Current Limitation |
Avoids drive over-current frequency fault. |
| High Performance |
Control of asynchronous and synchronous motors is implemented with high-performance current vector technology. |
| Time Management |
Time range: 0.0-6500.0 min |
| Communication Method |
Modbus (standard)
Profibus-DP (on request)
CANlink (on request)
CAN (on request) |
| Protection Modes |
Detection of motor short circuit upon power-on, protection of input or output phase drop, overcurrent, overvoltage, undervoltage, overheating, and overload. |
Wiring Diagram of the SPLC-NZ8400-5R5G/7R5P
SPLC-NZ8000 has multifunctional input-output control terminals, whose function can be independently set in the settings — to set the frequency, give a forward command, stop, etc.:
- Inputs: 8 discrete inputs (one of which is a high-speed pulse input), 2 analog inputs (one 0...10 V or 0...20 mA, the other only for +10...-10 V;
- Outputs: 1 discrete transistor output (high-speed), 2 relay 250 VAC 3 A or 30 VDC 1 A, 2 analog outputs (0...10 or 0...20 mA).
By default, the frequency inverter supports the most common communication port in enterprises in Ukraine RS-485, but on request, these inverters can be supplied with a board for data transmission via Profibus or CAN, allowing easy integration of equipment into any modern industrial network.
On order
