High-performance vector frequency inverters of the SPLC-NZ8400-710G/800P series are designed for controlling high-load three-phase electric motors 380 V with power up to 710 kW, where overloads may occur, and high control quality is required. These frequency inverters have a higher processor performance than the SPLC-AT20 series, allowing the SPLC-NZ8000 to execute operations faster and provide sensorless vector control of rotation speed with an accuracy of ±0.5%. If necessary, the inverter can switch to a simple scalar control mode U/f with less accuracy and to "Pump" mode for operating with more powerful motors but with less load (details below).
Additionally, the SPLC-NZ8000 inverter can be fitted with a PG board (purchased separately). With it, a sensor-encoder can be connected to the inverter for monitoring motor speed and rotor position. Feedback vector control enhances speed control performance and accuracy to ±0.02%, allows control of torque with accuracy up to ±5%, and is compatible with both asynchronous and synchronous motors.
Table — Main Technical Parameters of Inverters SPLC-NZ8400-710G/800P
| Input Voltage |
3Phase 380 V
|
| Output Voltage |
3Phase 380 V
|
| Output Power |
up to 710 kW (800 kW in "Pump" mode)
|
| Output Frequency Range |
from 0.1 to 3200.0 Hz (V/f) |
| Nominal Input Current |
1126 A (1460 A in "Pump" mode)
|
| Nominal Output Current |
1280 A (1380 A in "Pump" mode)
|
| Protection Degree EN 60529 |
IP20 |
When installing the frequency inverter in a protective cabinet, its control panel (operator panel) can be detached and moved to the front panel. For this, a cable connector must be purchased.
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
The carrier frequency automatically adjusts depending on the load nature. |
| 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 Accuracy |
±5% (CLVC, with PG) |
| Overload Capacity |
Type G: 60 s at 150% of nominal current, 3 s at 180% of nominal current
P Type: 60 s at 120% of nominal current, 3 s at 150% of nominal current |
| Torque Boost |
Auto boost
Manual boost 0.1%-30.0%
|
| V/F Curve |
Linear V/F curve
Multilayer V/F curve
Step V/F curve (1.2, 1.4, 1.6, 1.8, quadratic) |
| V/F Splitting |
Two types: full split, partial split |
| Acceleration/Deceleration Mode |
Linear curve
S-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 Set Speeds |
Implementation of up to 16 speeds through simple PLC function or terminal state combination |
| Built-in PID |
Enabling PID regulation in a closed system |
| Automatic Voltage Setting |
Can ensure constant output voltage when the main voltage changes. |
| Overcurrent and Overvoltage Management |
Automatic limitation of current and voltage during operation to prevent frequent tripping under overcurrent or overvoltage conditions. |
The inclusion of simple scalar control in SPLC-NZ8000 inverters allows for the selection of load type “General” or “Pump” in the menu.
-
General — 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 starting torque over 150% for acceleration to overcome friction and inertia.
-
Pump — specialized mode for fans, pumps, and other motors operating with torque increasing with rotation speed, where high starting torque is not required.
Thus, the frequency inverter SPLC-NZ8400-710G/800P is designed to control motors up to 710 kW, but when switched to scalar control and "Pump" mode can manage a motor up to 800 kW. However, the allowable overload will decrease: if in the normal "General" mode, a load of no more than 150% for 60 s or 180% for 3 s is allowed, in the "Pump" mode with a more powerful motor, these indicators are reduced — overload no more than 120% for 60 s or 150% for 3 s.
Individual Functions of SPLC-NZ8000
| Support for Different PG Boards |
Support for PG boards for rotary transformer, differential input, differential input UVW, resolver and open collector input |
| Run Through Power Loss |
Voltage drop is compensated by the feedback energy from the load, allowing the drive to continue operating for a short period. |
| Rated Current Limitation |
Avoids frequency drive overcurrent fault. |
| High Performance |
Management of asynchronous and synchronous motors is implemented through high-performance current vector technology. |
| Time Management |
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 power on, protection from input or output phase failure, overcurrent, overvoltage, undervoltage, overheating, and overload. |
Diagram of the SPLC-NZ8400-5R5G/7R5P Inverter
SPLC-NZ8000 has multifunctional input-output terminals that can be customised in the settings — to set the desired frequency, give a forward run command, stop, etc.:
- Inputs: 8 discrete inputs (one high-speed pulse), 2 analogue 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 analogue outputs (0...10 or 0...20 mA).
By default, the frequency converter supports the most common communication port in Ukrainian enterprises RS-485, but these frequency inverters can be supplied with Profibus or CAN communication boards upon request, allowing easy integration into any modern industrial network.
On order
