When Caché was installed, a group was defined for users who may stop/start/restart it (most likely cacheusr). You'll need to make the non-root user a member of that group, unless you'd prefer to use sudo as previously mentioned.
$ sudo usermod <username> -G cacheusr -a
If the user is already logged in, he/she may need to run newgrp to select cacheusr as their primary group:
$ newgrp cacheusr