The turbine control board, VTUR controls three primary overspeed trip solenoids and automatic synchronizing. It also interfaces to four passive pulse rate devices, and monitors shaft voltage and current. The speed signal cable to VTUR uses the J5 plug on the front of the board, and the other signals use the J3 connector on the VME rack. Terminal board TTUR provides simplex signals through the JR connector, and fans out TMR signals to the JR, JS, and JT connectors. J4 on the VME rack connects to the TRPG terminal board described in the Primary Trip section.A two-slot version of this board (VTURH2) is available for driving six trip solenoids using two TRPG boards. VTURH2 only accepts eight flame detectors.