High-performance vector frequency converters of the SPLC-NZ8400-5R5G/7R5P series are designed for controlling high-load three-phase electric motors 380 V with a power of up to 5.5 kW, where overloads may occur, and high control quality is required. These frequency converters have higher processor 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 converter can switch to simple scalar control mode U/f with less accuracy and a "Pump" mode for working with more powerful motors but with less loading (details below).
The SPLC-NZ8000 converter can also have a PG board installed (purchased separately). With it, an encoder sensor can be connected to the converter for tracking motor rotation speed and rotor position. Vector control with feedback provides increased speed and precision control of rotation frequency to ±0.02%, allows torque control accuracy up to ±5% and works not only with asynchronous but also synchronous motors.
Table — Main Technical Parameters of SPLC-NZ8400-5R5G/7R5P Frequency Converters
| Input Voltage |
3Ph 380 V
|
| Output Voltage |
3Ph 380 V
|
| Output Power |
up to 5.5 kW (7.5 kW in "Pump" mode)
|
| Output Frequency Range |
from 0.1 to 3200.0 Hz (V/f) |
| Rated Input Current |
15 A (20 A in "Pump" mode)
|
| Rated Output Current |
13 A (17 A in "Pump" mode)
|
| Protection Degree 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 connection cable needs to be purchased for this purpose.
Technical Specifications of the SPLC-NZ8400 Series
Standard Features of the SPLC-NZ8400 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
The carrier frequency is automatically adjusted based on the 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 Capability |
G type: 60 s at 150% of the rated current, 3 s at 180% of the rated current
P type: 60 s at 120% of the rated current, 3 s at 150% of the rated current |
| Torque Boost |
Automatic Boost
Manual Boost 0.1%-30.0%
|
| V/F Curve |
Linear V/F curve
Multipoint 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-curve
Four groups of acceleration/deceleration time range 0.0-6500.0 s
|
| DC Braking |
DC braking frequency: from 0.00 Hz to the 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 Multi-Speed Settings |
Implementation of up to 16 speeds via simple PLC function or combination of terminal states |
| Built-In PID |
Enables PID control of a closed-loop system |
| Voltage Auto-Tuning |
Provides consistent output voltage when the main voltage fluctuates. |
| Overcurrent and Overvoltage Protection |
Automatic current and voltage limit during operation to prevent frequent overcurrent or overvoltage tripping. |
The inclusion of simple scalar control in the SPLC-NZ8000 converters allows the selection in the menu of the load type "General" or "Pump".
-
General — general industrial mode for motors that work with approximately the same torque at different speeds (compressors, conveyors, elevators). In this mode, the frequency converter can provide a starting torque of more than 150% for acceleration to overcome friction and inertia.
-
Pump — a specialized mode for fans, pumps, and other motors that work with an increasing torque with rotation speed and when there is no need for high starting torque.
Thus, the frequency converter SPLC-NZ8400-5R5G/7R5P is designed to control motors up to 5.5 kW, but when switched to scalar control and "Pump" mode, it can control motors up to 7.5 kW. However, the allowable overload will be reduced: if in the standard "General" mode a load of no more than 150% for 60 s or 180% for 3 s is allowed, then in the "Pump" mode with a more powerful motor, these indicators are reduced — no more than 120% for 60 s or 150% for 3 s.
Individual Functions of SPLC-NZ8000
| Support for Different PG Boards |
Support PG boards for transformer rotation, differential input, differential input UVW, resolver and open collector input |
| Operation during Power Drop |
Voltage drop is compensated by the energy of the load feedback, allowing the drive to continue for a short period. |
| Rated Current Limitation |
Prevents frequency converter operation error due to over-current. |
| High Performance |
Management 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 (standard)
Profibus-DP (optional)
CANlink (optional)
CAN (optional) |
| Protection Modes |
Detection of motor short circuit during start, input or output phase break protection, overcurrent, overvoltage, undervoltage, overheating and overload protection. |
Principal Diagram of the SPLC-NZ8400-5R5G/7R5P Converter
SPLC-NZ8000 has multifunctional input-output control terminals, whose function can be self-assigned in settings — determine the set frequency, issue 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 upon request, these frequency inverters can be supplied with a board for data transmission Profibus or CAN, allowing easy integration into any modern industrial network.
On order
