[R-sig-ME] new R user struggling with error and convergence issues

[Jennifer Yourkavitch]

Hello!
I am fitting multilevel log-binomial models for a very large dataset (>53,000 observations), using glmer. I am getting this--  Error: (maxstephalfit) PIRLS step-halvings failed to reduce deviance in pwrssUpdate.
And the model is not converging. 
I think that increasing the number of iterations may remediate the convergence issue. But I can’t find the right syntax for that online.
Any advice re these two issues?
Many thanks,
Jennifer