Sanhua SD2 Series, User Manual

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Sanhua SD2 series drive
3 User Manual v3.5 –Sep-27.2022
2. INTRODUCTION
SD2 is a drive designed to control compressors with sensor-less brushless permanent magnet motors (BLDC) or
synchronous permanent magnet motors.
2.1 Functions and main features

Sensor-less SVPWM sine wave control, which can effectively reduce the high-order harmonic, motor vibration, torque
fluctuation and noise.

The weak magnetic control and MTPA control scheme can improve the compressor operating frequency range.

Double closed-loop feedback using for control strategy: Outer loop (speed) ensures the stable operating frequency;
Inner loop (current) ensures accurate torque output in real time.

High energy efficiency, miniaturization and high integration, which is convenient for production, testing and
maintenance.

A variety of protection functions (under voltage, over voltage, over current, over temperature, etc.) are implemented
through the DSP chip, which ensure the protection response quickly by various digital signal processing algorithms.

Power factor correction function can reduce the impact on the power grid and increase the voltage of the dc bus as
required to improve the operating frequency range, which could help drive to operate at ultra-wide input voltage
range (1-Phase Model only).

USB Programming Function (With external USB Programing tools).

Reinforced Isolation MODBUS communications.

Reinforced Isolation High pressure switch interface.

Reinforced Isolation discharge temperature sensor (DLT) interface.

Reinforced Isolation 0-10V Analog Input interface.

The distances are designed based on Pollution degree 3.

Applicable to the following refrigerant systems:
A1 refrigerant:
R410A/R448A/R744/R134a/R22/R417C/R404A/R407C…
A2L refrigerant:
R32/ R454A/R454B/R454C/R1234yf/R1234e
…
(Refrigerant with hot surface ignition temperature higher than
350
℃
)
A3 refrigerant:
R290/R600/R600a/R1270
…
(Refrigerant with hot surface ignition temperature higher than 350
℃
)
Note:

USB Programming function is realized by USB Off-line Programmer, disconnect drive and external control circuits
from the power supply, moving the main system switch to “off”.

This main function of this drive module is compressor drive and control, so that it does not include outdoor fan and
electronic expansion valve control, and not supply power to upper computer or other controllers. In principle, these
functions are performed by another master board or the upper controller provided from users.