Interface Between Mco 305, Fc 300, And Other Option Modules; Control Loops - Danfoss MCO 305 Design Manual

MCO 305 Design Guide
__ Introduction to VLT Motion Control Option MCO 305 __

Interface between MCO 305, FC 300, and other Option Modules

The Interface between MCO 305 and the FC 300 control card provides read/write access to all parameters
as well as reading status of all inputs and the possibility to control all outputs. In addition various process
data such as status word and actual motor current can be read by the MCO 305 application program.
MCO 305 is controlling FC 300 via the speed/torque reference; see section "Control loops" for further
details.
Field-bus interface (e.g. PROFIBUS and
DeviceNet): MCO 305 has read/write access to
data received/send via the various Field-bus
interfaces (requires optional Field-bus option
module).
Relay option MCB 105: The relay outputs of MCB
105 can be controlled by the MCO 305 application
program.
General purpose I/O option MCB 103: Status of
inputs can be read and outputs can be controlled
via the MCO 305 application program.
Up-/download of MCO 305 application programs and configuration data is done via the FC 300 interfaces
(RS485 or USB) or via PROFIBUS DPV1 (requires optional PROFIBUS module). The same applies for the on-
line PC software functions such as test-run and debugging.

Control Loops

MCO 305 has a PID (Proportional, Integral, Derivative) controller for position control based on actual
position (encoder feedback) and commanded position (calculated). The MCO 305 PID is controlling the
position in all modes of operation except velocity synchronizing where the velocity is controlled instead.
FC 300 is an "amplifier" in the MCO 305 control loop and it must therefore be optimized for the connected
motor and load before the MCO 305 PID can be set-up. FC 300 can be operated in open loop or closed loop
within the MCO 305 control loop, see example below:
Guideline for optimizing MCO 305 PID can be found in MCO 305 Operating Instructions.
Guideline for optimizing FC 300 can be found in FC 300 Operating Instructions.
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