High-performance vector frequency converters of the SPLC-NZ8400-500G/560P series are designed to control high-load three-phase electric motors 380 V with power up to 500 kW, where overloads can occur, and higher control quality requirements are imposed. These frequency converters have a higher microprocessor performance than the SPLC-AT20 series, allowing the SPLC-NZ8000 to perform operations more quickly and thus ensure sensorless vector control of rotational speed with an accuracy of ±0.5%. If necessary, the inverter can be switched to simple scalar control mode U/f with less precision and "Pump" mode for working with more powerful motors but with lower load (details below).
The SPLC-NZ8000 converter can also additionally have the PG board (purchased separately). With it, a sensor-encoder can be connected to the inverter to track motor rotation speed and rotor position. Vector control with feedback provides increased responsiveness and control accuracy of rotation frequency down to ±0.02%, allowing torque management with precision up to ±5% and working with not only asynchronous but also synchronous motors.
Table — Main technical parameters of frequency converters SPLC-NZ8400-500G/560P
| Input Voltage |
3ph 380 V
|
| Output Voltage |
3ph 380 V
|
| Output Power |
up to 500 kW (560 kW in "Pump" mode)
|
| Output Frequency Range |
from 0.1 to 3200.0 Hz (V/f) |
| Rated Input Current |
835 A (920 A in "Pump" mode)
|
| Rated Output Current |
860 A (950 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 brought to the front panel. For this, a connector cable needs to be purchased.
Technical Specifications of the SPLC-NZ8000 Series
Standard functions of the 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 |
Auto 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-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/deceleration time: 0.0-6500.0 s
|
| Built-in Multiple Set Speeds |
Implementation of up to 16 speeds via simple PLC function or combination of terminal states |
| Built-in PID |
Enabling PID regulation of the closed loop system |
| Voltage Auto-tuning |
Can provide constant output voltage when mains voltage changes. |
| Over-current and Over-voltage Control |
Automatic current and voltage limitation during operation to prevent frequent over-current or over-voltage tripping. |
Enabling simple scalar control in SPLC-NZ8000 converters makes it possible to choose in the menu the load type “General” or “Pump”.
-
General — general industrial mode for motors working with approximately the same torque at different speeds (compressors, conveyors, lifts). In this mode, the frequency converter can provide a starting torque of over 150% for acceleration to overcome friction and inertia.
-
Pump — specialised mode for fans, pumps, and other electric motors, working with torque that increases with rotation speed and when there is no need for high starting torque.
Yes, the SPLC-NZ8400-500G/560P frequency converter is designed for controlling motors up to 500 kW, but when switched to scalar control and "Pump" mode, it can control a motor up to 560 kW. However, the permissible overload will be reduced: if in the usual "General" mode, a load of no more than 150% for 60 s or 180% for 3 s is allowed, then in "Pump" mode with a more powerful motor these indicators decrease — overload not more than 120% for 60 s or 150% for 3 s.
Individual Functions of SPLC-NZ8000
| Support for Various PG Boards |
Support for PG boards for rotary transformers, differential input, differential input UVW, resolver, and open collector input |
| Power Drop Ride-through |
Voltage drop is compensated by load feedback energy, thus allowing the drive to keep running for a short time. |
| Rated Current Limitation |
Prevents current overindulgence drive faults. |
| High Performance |
Control of asynchronous and synchronous motors is implemented using 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 at startup, protection against input or output phase break, overcurrent, overvoltage, undervoltage, overheating, and overload. |
Principle Diagram of the Inverter SPLC-NZ8400-5R5G/7R5P
The SPLC-NZ8000 possesses multifunctional input-output control terminals, whose function can be independently assigned in the settings — to determine the set frequency, issue a forward run command, stop, etc.:
- Inputs: 8 discrete inputs (of which one is 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 widespread communication port in Ukrainian enterprises RS-485, but on request, these frequency inverters can be supplied with a Profibus or CAN data transfer board, making it easy to integrate equipment into any modern industrial network.
On order
