General Information about the Product |
Part Number |
DS3800DSQD1A1A Mark IV DS3800 |
Description |
GE General Electric DS3800DSQD1A1A DS3800DSQD Sequencer Auxiliary Board Mark IV |
Condition |
used Cleaned and Tested. With 1 Year Warranty. |
What this board is
The DS3800DSQD is a sequencer auxiliary board in the GE Speedtronic Mark IV turbine control system. DS3800 is the Mark IV family prefix — not Mark V (DS200), not Mark VI (IS200). The three generations share no cards.
Sequencing is what gets a turbine from standstill to load and back again in the right order: purge, crank, fire, warm-up, accelerate, synchronise. A board in the sequencer path is therefore a board you notice on startup rather than during steady running.
The symptom pattern worth knowing
Sequencer faults tend to present as a turbine that will not advance past a particular step rather than as a turbine that trips. If your unit purges normally and then sits, or reaches crank speed and refuses to fire, and the permissives all read satisfied at the HMI, the sequencing logic is worth looking at before you start chasing field devices.
Equally: if the machine runs happily once it is up, a sequencer board is unlikely to be your problem. Steady-state faults live elsewhere.
Mark IV sourcing
Mark IV is long out of production. Everything on the market is surplus, refurbished or new-old-stock, and availability is not merely slow — it is unpredictable. A board can be on a shelf this week and gone for eight months. Sites still running Mark IV are generally better served holding a critical spare set than sourcing during an outage.
Reading the number
DS3800DSQD1A1A splits into the family prefix (DS3800), the functional acronym (DSQD) and the trailing group and revision digits (1A1A). Some suppliers list the short functional form only. If a search on one form comes up empty, try the other. Read the number off the board itself; on panels this old, cabinet documentation is often several outages out of date.
This unit
Used, cleaned and tested, supplied with a 1-year warranty.
What to include in your quote request
- The full part number including trailing digits.
- Which sequencing step the unit is failing at, if this is a live fault.
- The turbine and panel this board serves.
- Whether this is a breakdown or a shelf spare.
- Whether you can accept a superseding revision.
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