ABB DSPC174 3BSE005461R1 SPC 174 processor module
Direct torque controlThe speed and torque of the motor is controlled by
DTC (Direct Torque Control). DTC provides accurate speed and torque control, and high dynamic
speed response.
Switching of the semiconductors in the INU is
directly controlled in accordance with the motor
core variables flux and torque.
The measured motor currents and DC link voltages
are inputs to an adaptive motor model. The model
produces exact values of torque and flux every 25
microseconds. Motor torque and flux comparators
compare the actual values to reference values
which are produced by the torque and flux reference controllers.
Depending on the outputs from the hysteresis controllers, the switching logic directly determines the
optimum switch positions every 50 microseconds
and initiates switching whenever required.
Peripheral I/O devices
The peripheral input and output devices connected
to the AMC circuit board of the INU include:
• Local CDP control panel
• IOEC I/O modules for parallel signal transfer to
external devices
• Optional Fieldbus communication interfaces
(option) for serial data transfer to a higher-level
control system
• PC-based service tools comprising:
- DriveWare® software tools
DriveWare® includes software tools such as
the commissioning and maintenance tools
DriveWindow and DriveDebug, and
DriveOPC for data transfer between ABB
drives and Windows®-based applications.
- DriveMonitor (option)
DriveMonitor is a monitoring and diagnostics tool that allows access to the drive from
any location in the world via a secure internet connection.

Internal and external, analog and binary I/O signals are connected to
the control system by IOEC modules.
3.3.1 IOEC I/O modules
Overview
The standard I/O includes one external module
(IOEC 2) and one module that is internal to the
drive operation (IOEC 1). The standard I/O pro vides standard control and supervision functional ities sufficient for most applications.
The drive can include optional expansion I/O that
includes an external module (IOEC 4) and an inter nal module (IOEC 3). These expansion modules pro vide extra inputs and outputs for control and
supervision as may be required by ABB or the cus tomer to support various control options.
References
3-5 IOEC modules
location
3-5
1. Standard internal IOEC 1 (A3401)
2. Standard external IOEC 2 (A3411)
3. Optional internal IOEC 3 (A3421)
4. Optional external IOEC 4 (A3431)