algebraic operation with normal random values in Modelica

i've got such code in Modelica:\

model BioPowerSetup  
Modelica.Blocks.Interfaces.RealOutput BioPowerOutput;  
parameter Real alpha = 0.05;   
parameter Real mu1 = 7 / 25 ;   
Real Nmax = 25;   
parameter Real D = 0.2 ;   
Modelica.Blocks.Noise.TruncatedNormalNoise Noise(y_min = -0.028, y_max = 0.028, samplePeriod = 1); equation   
if BioPowerOutput < 489100 then    
 BioPowerOutput = alpha * mu1 * (Nmax * exp(mu1 * time));   
else     
BioPowerOutput = 489100 * exp(Noise.y * time);   
end if; 
end BioPowerSetup;

After compiling this program, it interrupts on the 55s with such error:

Warning: [EVENT]  Mixed block did not converge during event iteration. [b4»]   [@55.0 s] 
Error: [GENERAL] Mid-simulation event iteration didn't converge. [@55.0 s]

I will be glad of any help!

I think, that error is located in the algebraic operation with noise value, but i don't know what to do with it.