IS200SSVPH1A - Servo I/O Terminal Board

IS200SSVPH1A - Servo I/O Terminal Board IS200SSVPH1A - Servo I/O Terminal Board

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Part Number: IS200SSVPH1A
Manufacturer: General Electric
Series: Mark VIe
Product Type: Servo I/O Terminal Board
Number of inputs: 6
Number of outputs: 2
Power supply voltage: 28 V dc
Voltage Range: 14 to 32 V dc
LVDT excitation output: 3.2 ±0.2 kHz
Outputs: 24 V dc
Mounting: DIN-rail mounting
Technology: Surface mount
Operating temperature: -30 to 65°C
Size: 33.02 cm high x 17.8 cm
Repair: 3-7 Day
Availability: In Stock
Weight: 2 lbs
Country of Origin: United States
Manual: GEH-6721L


IS200SSVPH1A is a Servo I/O Terminal Board manufactured and designed by General Electric as part of the Mark VIe Series used in GE Distributed Control Systems. Two electro-hydraulic servo valves are connected to the Servo I/O (SSVP) terminal board, which operates the steam valves. Linear variable differential transformers (LVDT) or linear variable differential reluctance transformers are used to measure valve position (LVDR). The PSVP I/O pack and the WSVO servo driver are the only devices for which SSVP is intended. Both the VSVO board and the PSVO pack are incompatible with it. A simplex terminal board is the SSVP. Using two SSVPs and externally fanning the inputs supports dual redundancy. Use three SSVPs and externally fan the LVDT inputs by using jumpers to transmit the signal from one SSVP to the next for TMR redundancy. Plug P28IN allows a single 28 V dc supply to be connected.


  • The TB1 I/O terminal block is where sensors and servo valves are directly linked. Two screws hold the block in place, and its 24 terminals may accommodate cabling as thick as #12 AWG. The terminal block is direct to the left of a shield terminal strip that is connected to the chassis ground. Either JD1 or JD2 is connected with external trip wiring.
  • Each SSVP servo output can accommodate either paralleled coils from a two-coil servo or a single coil from an electro-hydraulic servo actuator with three coils. In order to reduce thermal stress on the current driver in the event of a short output, the user chooses the current limiting resistor value based on the rated coil current. For Servo 1 and Servo 2, respectively, Jumper JP1 and JP2 determine the resistance value.
  • The SSVP connector with the designated P28IN accepts the P28 power input for the PSVP and WSVO. The P28 bus, which supplies power to the WSVO servo driver module and the PSVP pack, is turned on using switch SW1. If 28 V dc is delivered to the SSVP, a P28IN-labeled LED illuminates.
  • Prior to the user turning SW1 to the P28ON position, the P28ON LED will be OFF. In the event that the PSVO pack is unintentionally connected to the JA1 connector, a third LED, PSVP ONLY, will illuminate.


The SSVP servo terminal board offers one pulse rate input, six channels of LVDT/R position feedback, two channels of LVDT/R excitation, and two channels of bi-directional servo current outputs. It accepts input from up to six LVDT valve position inputs and offers four excitation outputs. For each servo control loop, there is a choice of one, two, or three LVDT/Rs. The steam turbine's primary speed is controlled by the single pulse rate input.

Each servo output has its own suicide relay, which is managed by firmware, and which, when de-energized, shorts the WSVO output signal-to-signal common before returning to normal limits in response to a manual reset instruction. In order to prevent a short from spreading to additional servos connected in parallel to the suicided servo, each servo output also has an isolation relay. Each servo's output condition, including its voltage, current, and suicide relay, is monitored via diagnostics. 


In a simplex system, servo 1 is configured for the correct coil current with jumper JP1. Servo 2 is configured with jumper JP2. In a TMR system, one servo from three different SSVPs provides the drivers needed for three coils. In this case, the LVDT inputs are fanned externally to all three SSVPs. All other servo board configuration is done from the ToolboxST application.

WOC has the largest stock of GE Distributed Control System Replacement Parts. We can also repair your faulty boards. WORLD OF CONTROLS can also supply unused and rebuilt backed-up with a warranty. Our team of experts is available round the clock to support your OEM needs. Our team of experts at WOC is happy to assist you with any of your automation requirements. For pricing and availability on any parts and repairs, kindly get in touch with our team by phone or email.


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How are boards packaged for shipment from WOC?

Parts are placed in antistatic packets and securely packed in ESD boxes cushioned with ESD Foam designed to safeguard electrical components.