Relay Outputs on the GE Speedtronic Mark V

The DS200TCRA is the Mark V board that stands between the panel's output logic and the solenoids, motors and contactors it commands in the field. It carries up to thirty electromechanical plug-in relays, K1 through K30, and each one is a real contact that makes or breaks a field circuit when the turbine control asks for it. That mechanical duty is exactly why the relay board is a routine spare in most Mark V fleets.

The board is located in the Mark V digital I/O rather than in the <R>, <S>, <T> or <C> control cores. A digital I/O core holds a pair of TCRA boards driven by a TCDA digital I/O board, with the relay contacts brought out to the DTBC and DTBD terminal boards. The card stores no configuration; the terminal-board jumpers, not the TCRA, decide whether an output is a dry contact or a wetted solenoid supply.

Before You Condemn the Relay Card

It pays to prove the fault is on this board before you order one. The Mark V energizes a relay by having the TCDA sink one side of the coil to common while the other side is held at a fixed voltage, so a relay that will not pick up can be a TCDA driver problem, a ribbon-cable problem, a worn relay, or a fault in the field — and only two of those are the TCRA's doing.

• Verify the command reaches the TCDA. No command there means the issue is upstream and a new relay board changes nothing.
• Command present but no contact movement narrows it to the relay, the board, or the ribbon; watch for a plug-disconnected alarm that flags the ribbon.
• Test the field circuit. A shorted 125 VDC solenoid can burn the relay and the terminal-board traces and will destroy a replacement if it is fitted before the short is repaired.

The field consensus is straightforward: relays wear out and are usually replaced individually, while the whole board tends to fail only after a surge, a battery ground, or a downstream short. Knowing which you have is the difference between a quick relay swap and a wasted board.

How the TCRA Connects to the Rest of the Panel

The TCRA is one part of the Mark V I/O group. It is driven by the TCDA, terminated on the DTBC and DTBD boards, sits alongside the TCQA analog I/O, and draws its power through the TCPS. The GE Mark V DS200 Boards Explained guide maps how these connect, and the GE Mark V DS200 Boards collection shows current availability. If a control migration is on the horizon, Mark V vs Mark VI: DS200 to IS200 explains how the DS200 I/O becomes IS200.

Reading the Revision on Your TCRA

This card is a DS200TCRAG1A, full number DS200TCRAG1ACC. That breaks into DS200 (Mark V series), TCRA (relay-output function), G1 (group) and ACC (revision). A group 2 build also exists as DS200TCRAG2A, and because a group change can bring build differences, you should match the group and revision your panel was commissioned with, or confirm that a newer revision supersedes yours. Use the GE Speedtronic Part Number Decoder to check the fields, and read the number from the board silkscreen rather than any slot marking.

Details for an Accurate Quote

• The full part number and revision (DS200TCRAG1ACC) from the board.
• A photo of the label and silkscreen.
• Turbine model and Mark V type (Simplex or TMR).
• The serving core and the revisions of any paired boards.
• Quantity and urgency.

Request Your Quote Today

This DS200TCRAG1ACC is new surplus, supplied as an open box with a one-year warranty. Send the details above using the Request a Quote button and we will respond within 24 hours with availability and lead time. We ship worldwide DDP and accept purchase orders.