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Solution not converged..

Solution not converged..

Solution not converged..

(OP)
Hi
I have a problem with electrostatic simulation. I'm trying to simulate a membrane with an electrode below. Performing a simulation in some range of voltage gives following results:
Let's assume that for 15 volts that membrane touches the electrode. In range 0-13V results are correct, in range 13-16 the following error occurs:

--------------------------------------------------------
Solution not converged at time 1 (load step 1 substep 1)
Run terminated
--------------------------------------------------------

in range 16-... results are correct.
How to eliminate this problem?


----------------------------------------------------------
Program listing
For 14V ansys gives an error
The same problem occurs when i create transducers manually (using E command)
----------------------------------------------------------

FINISH
/CLEAR

/CWD,'C:\temp\ansys'


!* membrane
Lm=300
Wm=300
Tm=5

!* membrane_division
b=30

!* electrode_distance
h=-0.3
dif=20

!* voltage
v=14

/PREP7

   ET,1,SHELL63
   R,1,Tm

   ET,2,TRANS126

   MP,EX,1,130e+9*1e-6
   MP,DENS,1,2330*1e-18
   MP,PRXY,1,0.278

   WPOFFS,0,0,dif
   RECTNG,0,Lm,0,Wm
   WPOFFS,0,0,-dif

   LESIZE,ALL,,,b

   TYPE,1
   MSHAPE,0,2D
   MSHKEY,1
   AMESH,ALL

   !* transducer

   NSEL,S,LOC,Z,dif

   CM,tr,NODE
   ALLSEL,ALL

   EMTGEN,'tr','EMTELM','EMTPNO','UZ',h,0,1E-02,0.8854E-05

   NSEL,S,LOC,Z,dif+h
   D,ALL,,0,,,,UZ
   D,ALL,VOLT,v

   CMSEL,S,TR
   D,ALL,VOLT,0

   !* applying loads and BC

   NSEL,S,LOC,X,0
   NSEL,A,LOC,X,Lm
   NSEL,A,LOC,Y,0
   NSEL,A,LOC,Y,Wm

   D,ALL,UX,0
   D,ALL,UY,0
   D,ALL,UZ,0
   D,ALL,ROTX,0
   D,ALL,ROTY,0
   D,ALL,ROTZ,0

   ALLSEL,ALL

FINISH

/SOLU
   ANTYPE,STATIC


   SOLVE
FINISH

----------------------------------------------------------

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