tansient analysis in ansys+un convergence

[arz8319109]

Dear,all
I want to do a transient analysis with ansys.
time duration: 3400s
But I get unconvergence problem after 40 or 50 second with 0.1 time increment and 600 second with 5 time increment (time step)

What is the problem or how can I guess the problem?

(I want to do a run-up analysis for a rotor with bearing is modeled with comb14)
!!!!
/solu
/out,blackpage
antype,4 ! transient analysis
nlgeom,on ! Turn on Large Deformation Effects
solcontrol,on,on
kbc,0 ! stepped BC's
rescontrol,,none ! Do not keep any restart files
trnopt,full,,,,,nmk ! HHT time integration method
tintp,0.1 ! Numerical Damping
nodeUnb = node(0.6,0,0)
f,nodeUnb,fz,%fzTab% !jahat check shavad
f,nodeUnb,fy,%fyTab% !jahat check shavad
CNVTOL,F,1
CNVTOL,M,1
CNVTOL,U,1

autots,off ! User turned off automatic time stepping
deltim,5,5,5
time,3400.
timint,on ! Turn on time integration effects
nldiag,nrre,1
coriolis,on,,,on
omega,spin
!----------------------------------
! specify results file requirements
!----------------------------------
outres,all,none
outres,nsol,25
outres,misc,1
!------------------------------------
! Solve commands
!------------------------------------
solve



for time step:5s


Time= 600.00 Load Step= 1 Substep= 120 Equilibrium Iteration= 22.
F Convergence Norm= 0.12595E-01 Previous Norm= 0.14467E-01
U Convergence Norm= 0.29992E-06 Previous Norm= 0.34449E-06
M Convergence Norm= 0.26145E-10 Previous Norm= 0.29682E-10
FORCE CONVERGENCE VALUE = 0.1097E-01 CRITERION= 0.5000E-02
MOMENT CONVERGENCE VALUE = 0.2247E-10 CRITERION= 0.5000E-02 <<< CONVERGED
Writing NEWTON-RAPHSON residual forces to file: file.nr002
curEqn= 28322 totEqn= 28322 Job CP sec= 2182.407
Factor Done= 101% Factor Wall sec= 0.377 rate= 3830.7 Mflops
curEqn= 28322 totEqn= 28322 Job CP sec= 2182.407
Factor Done= 101% Factor Wall sec= 0.000 rate= 0.0 Mflops
DISP CONVERGENCE VALUE = 0.2611E-06 CRITERION= 0.5000E-02 <<< CONVERGED
EQUIL ITER 22 COMPLETED. NEW TRIANG MATRIX. MAX DOF INC= -0.5837E-08
FORCE CONVERGENCE VALUE = 0.9547E-02 CRITERION= 0.5000E-02
MOMENT CONVERGENCE VALUE = 0.1988E-10 CRITERION= 0.5000E-02 <<< CONVERGED
Writing NEWTON-RAPHSON residual forces to file: file.nr003