IS220PSVOH1A, REV G - Servo Control I/O Module

SPECIFICATIONS:

Part Number: IS220PSVOH1A, REV G
Manufacturer: General Electric
Product Type: Servo Control I/O Module
Function: I/O Module
Series: Mark VIe
Number of outputs: 2
Power supply voltage Nominal: 28 V DC
Pulse rate accuracy: 0.05%
Magnetic PR pickup signal generates: 150 V
Operating temperature: -30 to +65°C
Size: 8.26 cm high x 4.19 cm
Input Filter: Hardware Filter, 4 ms
Technology: Surface-mount
Availability: In Stock
Weight: 0.8kg
Repair: 3-7 days
Country of Origin: USA
Manual: GEH-6721D

FUNCTIONAL DESCRIPTION:

IS220PSVOH1A, REV G is a Servo Control I/O Module manufactured and designed by General Electric as part of the Mark VIe Series used in GE Distributed Turbine Control Systems. The PSVO I/O pack serves as the electrical interface between one or two I/O Ethernet networks and a TSVO servo terminal board. It includes a processor board used across all Mark VIe distributed I/O packs, along with a specialized I/O board designed specifically for servo functions. This pack works in conjunction with the adjacent WSVO servo driver module to manage two servo valve position loops, offering a choice of five output current levels ranging from 10 to 120 mA DC. It provides LVDT excitation, supports up to eight LVDT feedback inputs, and accepts two pulse rate inputs from fuel flow meters. Inputs are received via dual RJ45 Ethernet ports, while 28 V DC power is supplied from the terminal board. Outputs are delivered through a DC-62 pin connector, which links directly to the terminal board. For diagnostics, the pack features LED indicators for visual status and includes an infrared port for local diagnostic serial communication.

POWER MANAGEMENT:

The PSVO includes power management in the 28 V input circuit. The management function provides a soft start to control current inrush during power application. After applying power, the circuit provides a fast current limit function to prevent a pack or terminal board failure from propagating back onto the 28 V power system. When power is present and working properly, the green PWR indicator will light. If the current limit function operates, the indicator will be out until the problem is cleared.

INSTALLATION:

• Securely install the appropriate terminal board in its designated location.

• Insert one I/O pack for simplex configurations or three packs for TMR (Triple Modular Redundant) systems directly into the terminal board connectors.

• Fasten the packs using the threaded inserts located next to the Ethernet ports. These inserts attach to a mounting bracket designed for the specific terminal board type. Adjust the bracket position to ensure there is no lateral or right-angle stress on the DC-62 pin connector between the pack and the terminal board. This adjustment is typically a one-time requirement over the product’s lifespan.

• Connect the WSVO servo driver modules into the J2 48-pin connectors and secure them with the four designated screws.

• Connect one or two Ethernet cables, depending on your system setup. The pack supports operation through either port. For dual Ethernet connections, the standard approach is to connect ENET1 to the network associated with the R controller. However, the PSVO automatically manages network traffic regardless of which port is used.

• Power on the packs and WSVO driver modules using the power switches on the TSVO terminal board. Use switch SW3 for R, SW2 for S, and SW1 for T. Confirm proper operation by checking the indicator LEDs.

• Complete the setup by configuring the I/O pack as required.

OPERATIONS:

The processor board interfaces with an acquisition board that is specifically designed for the I/O pack's function. When power is applied, a soft-start circuit gradually increases voltage to the processor board. This triggers the activation of local power supplies and releases the processor from reset. The processor then performs self-diagnostic tests and loads the appropriate application code from its onboard flash memory, which is specific to the I/O pack type. It checks the board ID to confirm compatibility between the application code, acquisition board, and terminal board. Once a correct match is verified, the processor uses the terminal board’s unique identification to request a network address via DHCP. After successfully initializing the Ethernet connection, it programs the onboard logic, begins executing the application, and enables the acquisition board to start operation.

• High-speed processor with RAM and flash memory
• Two fully independent 10/100 Ethernet ports with connectors
• Hardware watchdog timer and reset circuit
• Local ambient temperature sensor
• Infrared serial communications port
• Status-indication LEDs
• Electronic ID and the ability to read IDs on other boards
• Substantial programmable logic supporting the acquisition board
• Input power connector with soft start/current limiter
• Local power supplies, including sequencing and monitoring

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FREQUENTLY ASKED QUESTIONS:

What is the primary function of the Servo Control I/O Module (PSVO)?

The PSVO module serves as the interface between Ethernet-based I/O networks and the TSVO servo terminal board. It controls servo valve positioning, provides LVDT excitation, receives LVDT feedback, and interfaces with fuel flow meters.

What types of servo valve output currents are supported?

The module supports five selectable DC output current ranges for servo valve control, ranging from 10 mA to 120 mA.

How are the modules mounted and secured?

PSVO packs are directly plugged into the terminal board and mechanically secured using threaded inserts and a mounting bracket. The bracket must be adjusted to avoid lateral force on the DC-62 connector.