IC3600SSVG1C1B: Servo Valve Drive Card (SRVO. VALV. DRV)
The IC3600SSVG1C1B is the servo valve drive card in GE's Mark I / Mark II Speedtronic (IC3600) turbine control system GE's own shorthand for the board is "SRVO. VALV. DRV." This listing covers a clean, tested, used SSVG at the 1C1B variant. It is the card that takes a low-level positioning command and turns it into the drive current that moves a hydraulic servo valve.
How the Servo Valve Drive Card Positions the Fuel or Steam Valve
Reference descriptions place the SSVG at the output end of a closed-loop servo control. It receives a low-level command from the turbine control (for example a valve-position reference derived from the control's voltage/valve error), converts it into a higher-power electrical drive for the servo valve coil, and continuously compares the commanded position with the actual position reported by a feedback element such as an LVDT trimming its output until the two agree. That precise, self-correcting valve positioning is what lets the Mark I-II regulate fuel or steam flow, and therefore turbine speed and load. Cross-references note the fuel servo valves are driven through the SSVF and SSVG cards, consistent with the SSVG's valve-drive role.
Hardover, Hunting, or Drift: Check These Before Blaming the SSVG
A misbehaving servo valve is one of the most misdiagnosed faults on these turbines. The classic symptoms a valve that slams hardover, hunts and oscillates, or slowly drifts off null are frequently caused by something other than the drive card:
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Feedback loss equals hardover. If the LVDT or its wiring opens, the loop no longer sees the valve and drives the output to an extreme. Check the feedback element and the SSVF feedback card first when a valve goes hardover.
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Servo valve coil. Measure the servo valve coil and wiring; a shorted or open coil mimics a dead drive card.
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Hydraulics. Confirm servo supply pressure and cleanliness; hunting and sluggish response often start here.
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Command and null. Verify the command signal into the card and the null and bias adjustment.
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Supplies and seating. Check the DC supplies and reseat and clean the edge connector.
Ruling those out is what separates a genuinely failed SSVG from a loop problem that no replacement card will fix.
The SSVG1C1B Suffix and What to Match
The code is IC3600SSVG (function) plus 1C1B (variant and revision). The "G" is the part that makes this a valve-drive card an SSVA control card or SSVB pressure control card will not substitute and the trailing 1C1B identifies the specific dash and revision to match. Confirm the whole string against your board; our GE Speedtronic Part Number Decoder shows how to read it.
Feedback and Companion Cards That Work With the SSVG
The SSVG pairs most directly with the SSVF servo valve feedback card and the servo valve and LVDT it drives, and it shares the nest with the SSVA and SSVB servo cards, analog reference cards and power supplies. Matching hardware is on our GE Mark I-II IC3600 Cards collection, with the wider line under GE Speedtronic Turbine Control Boards.
Send These Details for a Fast SSVG Quote
Include the full part number (IC3600SSVG1C1B), the revision on the board, a photo of the label and component side, your turbine model and Speedtronic generation, the valve it drives if known, the quantity, and your urgency (planned spare or unit-down).
Request a Quote for the IC3600SSVG1C1B
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General Information about the Product |
Part Number |
IC3600SSVG1C1B Mark I-II IC3600 |
Description |
IC3600SSVG1C1B By GE Speedtronic IC3600SSVG Servo Valve Drive Card |
Condition |
used Clean and Tested With 1 Year Warranty. |
