High-performance vector frequency inverters of the SPLC-NZ8400-400G/450P series are designed for controlling heavily loaded three-phase electric motors 380 V with a power of up to 400 kW, where overloads may occur, and high demands are placed on control quality. These frequency inverters have higher processor performance than the SPLC-AT20 series, which allows SPLC-NZ8000 to perform operations faster and thus provide sensorless vector speed control with an accuracy 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 motors but with less load (details below).
Also, the SPLC-NZ8000 inverter can optionally be equipped with a PG card (purchased separately). With it, the inverter can be connected to an encoder sensor to monitor the motor rotation speed and rotor position. Vector control with feedback provides increased speed and control accuracy of the rotation frequency to ±0.02%, allows controlling the torque with an accuracy of ±5%, and works not only with asynchronous but also with synchronous motors.
Table — Key Technical Specifications of Inverters SPLC-NZ8400-400G/450P
| Input Voltage |
3ph 380 V
|
| Output Voltage |
3ph 380 V
|
| Output Power |
up to 400 kW (450 kW in "Pump" mode)
|
| Output Frequency Range |
from 0.1 to 3200.0 Hz (V/f) |
| Rated Input Current |
670 A (790 A in "Pump" mode)
|
| Rated Output Current |
690 A (790 A in "Pump" mode)
|
| Protection Level EN 60529 |
IP20 |
When installing the frequency converter in a protective cabinet, its control panel (operator panel) can be detached and mounted on the front panel. A cable-connector must be purchased for this.
Technical Characteristics of SPLC-NZ8000 Series
Standard Functions of SPLC-NZ8000 Frequency Converter
| 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 based on load characteristics. |
| Frequency Setting Resolution |
Digital Setting: 0.01 Hz
Analogue 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
Stepped V/F Curve (1.2, 1.4, 1.6, 1.8, quadratic) |
| V/F Separation |
Two Types: Full Separation, Partial Separation |
| 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
Braking Current Action Selection: 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 Target Speeds |
Implementation of up to 16 speeds through simple PLC function or terminal state combination |
| Built-in PID |
Enables PID regulation in a closed-loop system |
| Auto Tuning Voltage |
Can provide constant output voltage when the main voltage changes. |
| Current and Voltage Overload Management |
Automatic current and voltage limitation during operation to prevent frequent tripping due to overloads. |
|
Enabling simple scalar control in SPLC-NZ8000 inverters allows selection in the menu for load type “General” or “Pump”.
-
General — General industrial mode for motors operating with approximately the same torque at different speeds (compressors, conveyors, lifts). In this mode, the frequency converter can provide a startup torque exceeding 150% for acceleration to overcome frictional and inertia forces.
-
Pump — Specialized mode for fans, pumps, and other motors that operate with a torque that increases with rotational speed and when high startup torque is not required.
Thus, the frequency converter SPLC-NZ8400-400G/450P is designed for controlling motors up to 400 kW, but when switched to scalar control and “Pump” mode, it can manage a motor up to 450 kW. At the same time, allowable overload will be reduced: if in the standard "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 figures decrease — overload is allowed no more than 120% for 60 s or 150% for 3 s.
Individual Functions of SPLC-NZ8000
| Support for Various PG Cards |
Support for PG cards for rotary transformer, differential input, UVW differential input, resolver, and open collector input |
| Ride Through Power Drop |
Voltage drops are compensated by load feedback energy, so the drive can continue to operate for a short time. |
| Rated Current Limitation |
Allows to prevent frequency overcurrent faults of the drive. |
| High Performance |
Control of asynchronous and synchronous motors is realized using high-performance current vector technology. |
| Time Control |
Time Range: 0.0-6500.0 min |
| Communication Method |
Modbus (default)
Profibus-DP (optional)
CANlink (optional)
CAN (optional) |
| Protection Modes |
Detection of motor short circuit during power-on, protection against input or output phase loss, overcurrent, overvoltage, undervoltage, overheating, and overload. |
Diagram of the SPLC-NZ8400-5R5G/7R5P Inverter
SPLC-NZ8000 features multifunctional input-output control terminals, whose functions can be self-assigned in settings — set frequency, give forward run command, stop, etc.:
- Inputs: 8 discrete inputs (including one pulse high-speed), 2 analogue inputs (one 0…10 V or 0…20 mA, 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 analogue outputs (0…10 or 0…20 mA).
By default, the frequency converter supports the most common communication port at enterprises in Ukraine RS-485, but on request, these frequency inverters can be supplied with a data transmission board Profibus or CAN, enabling easy integration of the equipment into any modern industrial network.
On order
