Sounds like it works like the plug reverse relay on my 10ee (the CVA is a copy of the 10ee). You throw it from fwd to rev, it drops out the fwd contactor, brakes the motor down to about 200rpm, releases the braking relay and throws in the reverse contactor.
Just reading up, the process is called 'plugging'
What is plugging for electric motors?
Plugging is type of electrical braking for motors that brings the motor to a rapid stop and, if allowed, reverses the motor's direction of rotation.www.motioncontroltips.com
Sounds like it works like the plug reverse relay on my 10ee...