IS230SSVPH1A - Servo Input/Output Terminal Board

SPECIFICATIONS:

Part Number: IS230SSVPH1A
Manufacturer: General Electric
Series: Mark VIe
Product Type: Servo Input/Output 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-6721_Vol_II

FUNCTIONAL DESCRIPTION:

IS230SSVPH1A is a Servo Input/Output Terminal Board manufactured and designed by General Electric as part of the Mark VIe Series used in GE Distributed Control Systems. The Servo I/O (SSVP) terminal board connects to two electro-hydraulic servo valves that actuate the steam valves. Valve position is measured with linear variable differential transformers (LVDT) or linear variable differential reluctance transformers (LVDR). SSVP is designed specifically for the PSVP I/O pack and the WSVO servo driver. It does not work with the VSVO board or the PSVO pack. The SSVP is a simplex terminal board. Dual redundancy is supported by using two SSVPs and fanning the inputs externally. Likewise, for TMR redundancy, use three SSVPs and fan the LVDT inputs externally by using jumpers to send the signal from one SSVP to another SSVP. A single 28 V dc supply comes in through plug P28IN. Plugs JD1 or JD2 are for an external trip from the protection module.

INSTALLATION:

Sensors and servo valves are wired directly to the TB1 I/O terminal block. The block is held down with two screws and has 24 terminals accepting up to #12 AWG wiring. A shield terminal strip attached to the chassis ground is located immediately to the left of the terminal block. External trip wiring is plugged into either JD1 or JD2.

Each SSVP servo output can support one coil of a three-coil electro-hydraulic servo-actuator or paralleled coils from a two-coil servo. Based on the rated coil current, the user selects the current limiting resistor value to limit thermal stress on the current driver in case of a short output. Jumper, JP1 selects the resistor value for Servo 1 and JP2 is for Servo 2.

The P28 power input for the PSVP and WSVO comes into the servo through the SSVP connector labeled P28IN. Switch, SW1 is used to enable the P28 bus that feeds the PSVP pack and the WSVO servo driver module. The LED labeled P28IN lights if 28 V dc has been applied to the SSVP.

The P28ON LED will remain OFF until the user turns SW1 to the P28ON position. The RED LED on SSVP labeled PSVP_ONLY will light if a PSVO instead of a PSVP I/O pack is accidentally plugged into the JA1 connector.

OPERATION:

Each of the servo output channels is designed to drive a single coil or parallel coils. The servo outputs are also designed to be paralleled as shown in the PSVP configuration section. Servo cable lengths up to 300 m (984 ft) are supported with a maximum two-way cable resistance of 15 Ω. Since there are many types of servo coils, a variety of bi-directional current sources are jumper-selectable.

A trip override relay K1 is provided on the terminal board, which is driven from the PPRO protection I/O pack. If an emergency overspeed condition is detected in the protection module, the K1 relay energizes, disconnects the servo output, and applies a bias to drive the control valve closed. This is only used on simplex applications to protect against the servo amplifier failing high, and is functional only concerning the servo coils driven from .

CONFIGURATION:

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 non-pilot/cylinder 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.

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FREQUENTLY ASKED QUESTIONS:

How are Servo I/O Terminal Boards integrated into turbine control setups?

These boards are typically connected to the control system's output channels, receiving control signals (such as PWM) that dictate the position or speed of servo motors responsible for turbine adjustments (e.g., blade pitch control).

What types of servo motors are commonly used with Servo I/O Terminal Boards in turbine applications?

In turbine control systems, high-torque servo motors capable of precise positioning are often used. These motors must be compatible with the voltage and current specifications supported by the Servo I/O Terminal Board.

How scalable are Servo I/O Terminal Boards for turbine control systems?

These boards can typically be scaled to accommodate different numbers of servo motors based on the specific needs of the turbine setup. Multiple boards can be used in parallel if more servo channels are required.