High-performance vector frequency converters of the SPLC-NZ8400-1200G series are designed to control high-load three-phase electric motors 380 V with a power of up to 1200 kW, where overloads may occur, and enhanced control quality is required. These frequency converters have higher microprocessor performance than the SPLC-AT20 series, allowing the SPLC-NZ8000 to perform operations faster and thus provide sensorless vector control with a rotation speed accuracy of ±0.5%. If necessary, the converter can switch to simple scalar control mode U/f with less accuracy and "Pump" mode for working with more powerful motors, but with less load (details below).
The SPLC-NZ8000 converter can also be equipped with an additional PG board (purchased separately). With it, a sensor-encoder can be connected to the converter to monitor the motor speed and rotor position. Vector control with feedback provides increased responsiveness and control accuracy of rotation frequency up to ±0.02%, allows torque management with accuracy up to ±5%, and enables operation with both asynchronous and synchronous motors.
Table — Main technical parameters of converters SPLC-NZ8400-1200G
| Input voltage |
3ph 380 V
|
| Output voltage |
3ph 380 V
|
| Output power |
up to 1200 kW (900 kW in "Pump" mode)
|
| Output frequency range |
from 0.1 to 3200.0 Hz (V/f) |
| Protection degree EN 60529 |
IP20 |
When the frequency converter is installed in a protective cabinet, its control panel (operator panel) can be detached and placed on the front panel. A cable-connector needs to be purchased for this purpose.
Technical specifications of the SPLC-NZ8000 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 depending on the load character. |
| Frequency setting 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
Multipoint 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 brake 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 preset speeds |
Implementation of up to 16 speeds through simple PLC function or combination of terminal states |
| Built-in PID |
Enabling PID regulation of the system in closed loop |
| Auto voltage tuning |
Can provide constant output voltage when the main voltage changes. |
| Overload current and voltage management |
Automatic current and voltage limitation during operation to prevent frequent tripping during current or voltage overload. |
When the simple scalar control is enabled in SPLC-NZ8400-1200G, the motor operates in the “General” load mode:
-
General — general industrial mode for motors that work with roughly equal torque at different speeds (compressors, conveyors, elevators). In this mode, the frequency converter can provide a starting torque of over 150% for acceleration, to overcome friction and inertia.
Individual functions of SPLC-NZ8000
| Support for various PG cards |
Support for PG cards for revolving transformer, differential input, UVW differential input, resolver and open collector input |
| Run through power drop |
Voltage drop is compensated by the feedback load energy, so the drive can continue to operate for a short time. |
| Rated current limitation |
Allows avoiding drive frequency overload failure. |
| High performance |
Control of asynchronous and synchronous motors are implemented through 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 at power-up, protection during input or output phase break, overcurrent, overvoltage, undervoltage, overheating and overload protection. |
Principle diagram of the frequency converter SPLC-NZ8400-1200G
SPLC-NZ8000 has multifunctional input-output control terminals, whose function can be self-defined in settings — determining the set frequency, giving start-forward command, stop, etc.:
- Inputs: 8 discrete inputs (one of which is high-speed pulse), 2 analog 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 analog 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 Profibus or CAN data communication board, which will allow easy integration of equipment into any modern industrial network.
On order
