IS220PSVPH1B - Servo Control I/O Module

SPECIFICATIONS:

Part Number: IS220PSVPH1B
Manufacturer: General Electric
Series: Mark VIe
Product Type: Servo Control I/O Module
Position Sensor Inputs: Six (6) Channels (LVDT/RVDT)
Servo Outputs: Two (2) Channels (Parallel redundancy supported)
Excitation Outputs: Two (2) Redundant Channels (Hot-backup)
Pulse Rate Input: One (1) Optimized Speed Feedback Input
Power Requirement: 28 V dc (supplied via terminal board)
Connectivity: Dual RJ-45 Ethernet (IONet)
Control Signal Input: 4–20 mA, ±10 VDC
Feedback Signal: LVDT
Technology: Surface Mount
SIL Compliance: SIL 2/SIL 3
Common Mode Voltage Range: ±5 V
Dimensions: 11.00 x 9.00 x 3.00
Operating temperature: 0 to 60 °C
No.of Analog Voltage Inputs: 6
Repair: 3-7 days
Availability: In Stock
Country of Origin: United States

FUNCTIONAL DESCRIPTION:

IS220PSVPH1B is a Servo Control I/O Module manufactured and designed by General Electric as part of the VIe Series used in GE Distributed Control Systems. The PSVP servo I/O pack, WSVO servo driver, and the SSVP terminal board provide an electro-hydraulic control for both new and retrofit steam turbine applications. The following are salient features of this product:

• Six position sensor input channels
• Two servo outputs with a parallel feature, allowing isolation of a failure in electronics
• Two excitation outputs with a hot-backup redundancy feature for a single position sensor valve
• A pulse rate input optimized for turbine speed feedback, similar to the PTUR and PPRO pulse rate inputs

The product firmware supports single, minimum-select, or maximum-select dual and mid-select triple position sensor input position regulators. The single and maximum-select dual pilot cylinder position regulators are available. The product does not support the flow rate regulators for liquid-fuel control or any of the position regulators supporting the land and marine (LM) gas turbines.

Input to the PSVP is through dual RJ-45 Ethernet connectors, and 28 V dc power is supplied from the terminal board. The output is through a 62-pin connector that connects directly with the associated terminal board connector. Visual diagnostics are provided through indicator light-emitting diodes (LEDs).

INSTALLATION:

• Directly plug one PSVP I/O pack into the terminal board connector.
• Mechanically secure the I/O pack using the threaded inserts adjacent to the Ethernet ports. The inserts connect with a mounting bracket specific to the terminal board type.
• The bracket location should be adjusted such that there is no right-angle force applied to the 62-pin connector between the I/O pack and the terminal board. The adjustment should only be required once in the service life of the product.
• Plug the WSVO servo driver assembly into the J2 48-pin connector and secure it with the four screws.
• Plug in one or two Ethernet cables, depending on the system configuration. The pack operates over either port. If dual connections are used, standard practice is to hook ENET1 to the network associated with the R controller; however, the PSVP is not sensitive to Ethernet connections and negotiates proper operation over either port.
• Plug the 28 V power into the SSVP P28IN 2-pin connector. Be sure the high is connected to pin 1, and the low is connected to pin 2.
• If PSVP redundancy is simplex, insert the plug for suicide protection from the protection module.
• If PSVP redundancy is dual, plug the RJ-45 connector from SSVP_R JLA to SSVP_S JUA, and from SSVP_R JLB to SSVP_S JUB.
• Apply power to the PSVP subassembly using the SW1 power switch on the SSVP. Check the indicator lights on the PSVP.
• Use the ToolboxST application to configure the I/O pack as necessary. Refer to GEH-6700 for more information.

PSVP CIRCUITRY:

The PSVP has a BSVP application board that provides six rms to V dc converters for position feedback. The rms to V dc converters accept a maximum of 7.07 V rms sine wave input. They change the AC input signal into a 10V DC input, read by the 16-bit analog-to-digital converter. The digitized position information is used in the valve position control loop in the PSVP firmware. The output of the position regulator is written to an analog-to-digital converter located on the BSVP. This analog output feeds the WSVO current regulator.

The PSVP also controls the servo suicide relay on the WSVO and the isolation relay on the SSVP. It inputs the servo driver output voltage and the servo current. Coil ohms are calculated in firmware by using the servo current feedback and the voltage monitored at the SSVP servo terminal points. The excitation source for the LVDT/R position sensor is generated using the processor board’s field programmable gate array (FPGA) to control a digital-to-analog converter. The converter’s 3.2 kHz sine wave is output to the SSVP terminal board, where the excitation driver is located. The excitation redundancy control is performed by a microcontroller located on the BSVP.

SPEED FEEDBACK & SIGNAL PROCESSING:

In addition to position control, the IS220PSVPH1B includes a high-performance pulse rate input. This input is technically aligned with the PTUR and PPRO pulse rate architectures, optimized for high-fidelity turbine speed feedback. This allows the PSVP to integrate speed data directly into its local control loops, facilitating faster protective responses and enhancing the overall stability of the steam valve regulation.

WOC has the largest stock of OEM Replacement Parts for GE Distributed Control Systems. We can also repair your faulty boards and supply unused and rebuilt boards backed up with a warranty. Our team of experts is available around 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 parts and repairs, kindly contact our team by phone or email.

FREQUENTLY ASKED QUESTIONS:

What is the IS220PSVPH1B?

It is a Servo Control I/O pack for the GE Mark VIe system, primarily used in steam turbine applications. It manages electro-hydraulic control by driving servo valves and monitoring position feedback from LVDTs or RVDTs.

What is the primary application for the IS220PSVPH1B?

The PSVPH1B is specifically designed for electro-hydraulic control in steam turbine applications. It is used to drive servo valves and monitor position feedback from LVDTs or RVDTs, ensuring precise control of steam flow.

Does the PSVP support liquid-fuel control for LM gas turbines?

No. According to the functional specifications, the PSVP does not support flow rate regulators for liquid-fuel control or any position regulators specifically designed for Land and Marine (LM) gas turbines. It is primarily a steam turbine control module.

How does the hot-backup excitation feature work?

For valves that rely on a single position sensor, the PSVP provides two excitation outputs. If the primary excitation source fails, the module automatically switches to the backup output without interrupting the position feedback signal, preventing a turbine trip.

What is the significance of the 62-pin connector?

The 62-pin connector provides a direct, high-density mechanical and electrical interface with the SSVP terminal board. This design eliminates the need for internal ribbon cables, reducing signal noise and simplifying the installation of the I/O pack onto the terminal board.