SD-MCU Control Unit

The control unit SD-MCU (SECOMDRIVE Main Control Unit) is a universal control system for low voltage Inverters completely developed internally.
Focused on industrial applications, the control unit currently covers a wide range of types of controls for induction motors, regenerative front-ends and much more.
The fiber optic connection between the control unit and the power section simplifies the wiring also in the parallelization of the converters.
SECOM Drive Manager (SDM) it is the drive parameter configuration tool that speeds up and simplifies commissioning, monitoring and any driver update made by the customer with a simple ethernet connection.

The SD-MCU allows you to select the most suitable control method based on your needs.
It offers control strategies for Inverter, F3E (Fundamental Frequency Front end regenative unit), AFE (Active Front end regenerative unit) and more.

The SD-MCU is equipped with an integrated realtime PLC (IEC61131-3) that allows you to create custom logics, manage automation at various levels, control both the I/O on board and interface I/O expansion modules or, again, interact with the control software.
For more information, contact our commercial team.

Technical data
Ambient condition
Altitude 1000 m. a.s.l.
Climate Temperate
Min./Max. operating temperature -40 ÷ +70°C
Storage temperature -40 ÷ +55°C
Relative humidity 10 ÷ 90% (from 0 to 40°C)
Main general data
Main supply voltage 24 Vcc
Consumption 300 mA
Protection degree IP20
Installation Wall mounting
I/O 16 Input - 10 output (6 relay 125 Vac - 4 output collector)
3 Analog Input (+/-5V or 4-20mA)
3 Analog input (+/-10V)
Comunicazione CANOpern (Master/Slave) – Modbus TCP/IP (Master/Slave)
Other protocols on request
Internal device Real time PLC
Dimensions 165 x 230 x 45 (W*D*H)
Weight 0.5 kg
Control type Grid control type and motor control type
Motor control system V/Hz - Field oriented - Sensorless FOC
Grid control system AFE - F3E - VAC
Control unit functions

The control unit SD-MCU comes with a series of functions that the user can select according to the type of application required.
Control unit functions
Flying restart To estimate the motor speed before start with demagnetized motor
Fast flying restart To estimate the motor speed before start in any condition (it requires SD-SYNC)
2 Digital potentiometer To generate a reference with configurable steps
2 JOG A pulse to reach a certain speed reference with a certain ramp time
Cold bypass (starter) To start the motor up to the grid voltage and frequency and afterwards the motor will be connected to the grid and the inverter will be bypassed
Hot bypass Bring the motor on line to the grid and vice versa
Helper (Master-follower) A master drive can control other slave drive with a reference of torque (for motor control) or current (for AFE)
Ride through (Kinetic regeneration)If the DC voltage goes down, the DC bus vale is substained by keeping the kinetic energy of motor and load
Grid waiting If the DC voltage goes down, power module switch off the pulses till the DC voltage be back
Current brake and/or Vdc Rollback To speed up the actual ramp stop time
Energy saver To reduce as much as possible the motor power loss
Safe torque off SIL 3 - safety function to avoid torque transfer
Speed droop To share the load when more motors are mechanically coupled
Other functions
Commissioning/ID test A usefull set of function to detect the motor parameters from plate data, or at standstill or in run for magnetization curve detection
Short circuit management For VAC generator, it is possible to control the short circuit current for protection selectivity with various strategy
Regulators auto-tuning Main regulator coefficients are autodetected
Configurable I/O Almost all the digital I/Os are configurable; for example an output can be connected to a bit of a command or status word
Various mechanical reference Up to 4 ramps time with various way to select them, 4 skip frequency, torque reference, up to 2 reference source, etc
Allarms configuration All the software alarm are configurable. The drive can perform even an OFF1/2/3 before switch to fault state
Internal custom PLC Users can program a custom PLC to add functionalities, expand I/O, etc

Download here the software user manual in PDF format

Download here the hardware user manual in PDF format

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