Nidec Control Techniques Unidrive SP AC Variable Frequency Governor

Nidec Control Techniques Unidrive SP Advanced User Manual (11th edition) for induction motors and servo motors, covering eight core modules including parameter structure, keyboard operation, advanced parameters, macro commands, serial communication, electronic nameplate, performance indicators, and rotor flux control (RFC). It supports four operating modes: open-loop/closed-loop vector/servo/regeneration, providing 22 menu parameters, SM series expansion modules, Modbus/ANSI communication, multi-level safety permissions, and comprehensive protection diagnostics, meeting compliance requirements such as EU Machinery Directive, RoHS, REACH, WEEE, etc.

Parameter structure system

Unidrive SP adopts a hierarchical menu architecture and strictly isolates permissions:

Menu 0: Basic common parameters (up to 59 items), factory open read-write

Advanced menu (1-22): Professional functions, requiring L2 permission to unlock

Expansion Module Menu (15-17): Exclusive Parameters for SM Series Expansion Cards

Second motor parameters (Menu 21): Dual motor switching configuration

Permission level:

Level Access Range Read/Write Permissions

L1 can only read and write Menu 0

L2 All menus can be read and written

Loc All Menu Read Only (Security Lock Activated)

Keyboard and operation

Provide two types of operation keyboards:

SM Keypad: LED digital tube, basic operation

SM Keypad Plus: LCD display, supports 5 languages, help text, screen saver, hardware key

Core operating mode:

Status mode: Display rdy/run/stop/trip and other statuses

Parameter viewing mode: Browse menus and parameter values

Edit mode: Modify parameter values

Keyboard control mode: direct start stop, speed regulation

Key operations:

Reset: Red STOP key/numeric command/communication trigger

Parameter saving: Pr x.00=1000 Reset and save

Restore default: Pr x.00=1233 (standard)/1244 (American standard)

Core parameters (x.00)

All menus contain the x.00 instruction parameter, which is the debugging core:

Command value function

Save 1000 parameters to EEPROM

1233 Load Standard Default Parameters

1244 loads default parameters for American standards

2001~9999 SMARTCARD data read/write, erase, compare

12000 only displays non default parameters

12001 only displays target parameters

Advanced parameter functions (Menu1-22)

Divided by functional modularization:

Menu 1: Speed/Frequency Reference, Limiting, Filtering, Preset Speed

Menu 2: Acceleration and deceleration ramp, S-curve, DC bus voltage stabilization and deceleration

Menu 3: Speed feedback, encoder, speed loop PID, overspeed protection

Menu 4: Torque control, current loop, current limiting

Menu 5: Motor control V/F、 Magnetic flux, automatic tuning

Menu 6: Timer, Timer, Running Logic

Menu 7: Analog I/O, Calibration, Filtering

Menu 8: Digital I/O, Logic, Terminal Configuration

Menu 9: Built in PLC and electric potentiometer

Menu 10: Status, Fault, Trip Records

Menu 11: System Settings, Version, Communication, Security

Menu 12: Threshold, variable selection, brake control

Menu 13: Position control and positioning

Menu 14: User PID Regulator

15~17. Expansion modules: Encoder I/O、 sports card

18~20. User application menu

Second motor parameters

Menu0 Extended Configuration

Operation mode

Supports four high-performance control modes:

Open loop: V/F control, sensorless

Closed loop vector: high-precision vector with encoder

Servo: Permanent magnet synchronous motor servo control

Regeneration: PWM rectification, energy feedback

Macro Instructions (Quick Debugging)

Built in 8 application macros, one click configuration:

Simple Mode

motorized potentiometer

preset speed

torque control

PID control

Axis limit control

Brake control

Digital locking

Communication Protocol

ANSI Protocol: Basic Serial Communication

Modbus RTU: Industry standard, supports 0~247 addresses and baud rates of 300~115200bps

Support register read/write, CRC check, and exception code feedback

Electronic nameplate

Supports Hiperface/EnDet encoders to store motor parameters, with bidirectional read and write capabilities, achieving plug and play functionality for motors.

Performance indicators

Digital reference: resolution 0.1Hz/0.1rpm, precision mode 0.001

Simulation reference: 12~16 bit high-precision

Speed loop bandwidth: up to several hundred Hz

Update rate: Normal 4ms, High speed mode 250 μ s

Current loop: Fast response, supports weak magnetic flux control

Rotor Flux Control (RFC)

The sensorless vector algorithm can achieve high-precision speed and torque control without the need for an encoder, and is suitable for high dynamic loads.

Protection and Alarm

Key protections: overcurrent, overvoltage, undervoltage, overload, overheating, overspeed, I/O failure, encoder error

Alarm display: br.rS, OVLd, hot, Auto tune, PLC, etc

Support automatic reset, fault recording, and trip locking

Key questions and answers

Question 1: What are the three most commonly used commands for the parameter x.00 of Unidrive SP? What functions are implemented separately?

answer:

1000: Save the modified parameters to the EEPROM of the frequency converter without losing them in case of power failure;

1233: Restore factory standard default parameters for initialization or fault reset;

12000: Only display non default parameters that have been modified, quickly locate debugging changes.

Question 2: What is the difference between keyboard permissions L1 and L2 for Unidrive SP? How to switch?

answer:

L1 (default): Only able to access basic parameters of Menu 0, unable to view advanced functions;

L2: Access to all 22 menus for professional debugging and programming.

Switching method: Set in Pr 0.49: 0=L1, 1=L2; After activating the security lock, a password is required to unlock it.

Question 3: What are the four operating modes supported by Unidrive SP? What occasions are they applicable to?

answer:

Open loop: no encoder, simple fan, water pump, conveyor belt;

Closed loop vector: with encoder, high-precision speed regulation, tension control;

Servo: permanent magnet synchronous motor, positioning, synchronization, machine tool, robot;

Regen: Energy feedback for lifting, downstream loads, and high-power energy-saving applications.