| Description | Type | Default | 
|---|---|---|
|  
				   Zero non-positive definite element mass matrix option. When set to ON, an eigensolution is performed for each point mass element (CONMi) mass matrix. If a negative principal mass or inertia is detected, the mass matrix for that element is set to zero.  | 
 
				   ON/OFF  | 
 
				   OFF  |