"First solve for initial conditions failed to converge." Thermal model

I struggle with my model failing to solve for my set initial conditions. I have built a thermal model for an electric actuator using thermal mass and convection blocks from simcape. However, I get a warning that there are conflicts between the model temperature constraint and the blocks target.

I am trying to set a starting temperature for the whole system at 20 degC, but in the following branch and mass codes I am not able to overrun the block's initial target. I have set "override" and the priority at high in the convection blocks parameters in simulink.

Example warning:

Branch.ssc with the first reffered equation:

component (Hidden=true) branch
% Thermal Branch
% This base component defines a branch with two ports in a thermal network.
% It also defines the temperature change and the heat flow rate through
% the branch.

% Copyright 2005-2016 The MathWorks, Inc.

nodes
    A = foundation.thermal.thermal; % A:left
    B = foundation.thermal.thermal; % B:right
end

variables (Conversion=relative)
    T = {0, 'degC'}; % Temperature difference
end

variables
    Q = {0, 'W'}; % Heat flow rate
end

branches
    Q : A.Q -> B.Q;
end

equations
    T == A.T - B.T;
end

end

Answer 1

[Martin]

Hello Kotryna,

The temperature on those blocks is a difference, not absolute. Also focus on specifying the differential variables, otherwise the system may become overspecified.

Martin