ROTORK IQ/IQT Series PC Board Modules

Technical Dossier

Product Details And Specifications

ROTORK IQ/IQT Series: Comprehensive Module Range and Technical Overview

The ROTORK IQ and IQT series of electric valve actuators and their associated PC board control modules represent one of the most widely deployed actuator control platforms in global heavy industry. Installed across petrochemical refineries, nuclear power stations, LNG terminals, offshore platforms, and chemical processing plants, the IQ/IQT series has established a dominant position in safety-critical valve automation applications. The modular PCB architecture of this series allows field-replaceable control, power, and communication boards, making long-term maintenance feasible even decades after initial commissioning. DriveKNMS maintains an active inventory of both current-production and obsolete IQ/IQT series PC boards to support facilities operating legacy infrastructure.

The Evolution of ROTORK IQ/IQT Series Architecture

The ROTORK IQ series was introduced in the early 1990s as a successor to the A-Range and GP-Range actuator families, incorporating digital control logic and non-intrusive setting capability via infrared interface. The original IQ Mark 1 platform used discrete logic PCBs with limited diagnostic capability. The IQ Mark 2 revision (mid-1990s) introduced enhanced torque logging and expanded the fieldbus option set. The IQ Mark 3 generation (2000s) brought a fully integrated microprocessor-based control board, expanded data logging to 1,200 event records, and introduced native HART, Profibus-DP, and Foundation Fieldbus communication daughter boards.

The IQT (quarter-turn) variant shares the same control board architecture as the IQ linear series but is optimized for rotary valve applications including butterfly and ball valves. Both series use a common backplane connector standard, meaning many control and power PCBs are interchangeable across IQ and IQT frames of the same generation. The IQ3 (Mark 3) platform, introduced circa 2005–2008, is the current production standard and remains backward-compatible with Mark 2 wiring harnesses in most configurations. Facilities operating Mark 1 hardware face the greatest obsolescence risk, as original PCBs for that generation are no longer manufactured and must be sourced from specialist distributors.

Key compatibility considerations: Mark 1 and Mark 2 control boards are not directly interchangeable due to firmware and connector differences. Mark 3 boards require the IQ3 software suite for configuration. Communication modules (Profibus, DeviceNet, Modbus) are generation-specific and must match the host control board revision.

ROTORK IQ/IQT Full Catalog & Functionalities (SKU List)

Control & Main Processor Boards

• 43409-03: IQ series main control PC board; primary logic and torque control processor for IQ Mark 2/3 actuators.
• 43409-01: IQ series control board, earlier revision; compatible with IQ Mark 1 and early Mark 2 frames.
• 43409-05: IQ3 series upgraded main control board with extended diagnostic memory and enhanced fieldbus handshake.
• 30-135-0001: IQT series main control PCB; quarter-turn variant processor board with torque profiling firmware.
• 30-135-0003: IQT3 control board, current-generation; supports IQ Insight configuration software.

Power Supply Boards

• 43406-01: IQ series power supply PCB; converts mains input (110–240 VAC) to regulated DC logic supply rails.
• 43406-03: IQ series power board, revised thermal management; replaces 43406-01 in high-ambient installations.
• 30-136-0001: IQT series power supply board; dual-rail output for control logic and motor drive circuits.
• 43407-02: IQ series auxiliary power board; provides isolated 24 VDC output for external instrumentation loops.

Display & Interface Boards

• 43410-01: IQ series LCD display and keypad interface PCB; local HMI board for status indication and parameter entry.
• 43410-03: IQ3 series display board with backlit LCD; supports non-intrusive infrared setting interface.
• 30-137-0001: IQT series display PCB; compatible with IQT Mark 2 and Mark 3 enclosures.

Communication & Fieldbus Adapter Boards

• 43412-01: IQ series Profibus-DP communication daughter board; supports DP-V0 and DP-V1 profiles.
• 43412-03: IQ series Foundation Fieldbus (FF-H1) communication module; intrinsically safe variant available.
• 43412-05: IQ series Modbus RTU/TCP communication board; supports RS-485 and Ethernet physical layers.
• 43412-07: IQ series DeviceNet adapter PCB; compatible with Allen-Bradley ControlLogix and CompactLogix DCS environments.
• 30-138-0001: IQT series HART communication board; 4–20 mA loop with superimposed HART protocol for position feedback.

I/O & Signal Conditioning Boards

• 43415-01: IQ series analog I/O board; provides 4–20 mA position transmitter output and remote setpoint input.
• 43415-03: IQ series digital I/O expansion board; adds 8 additional discrete input/output channels for interlock wiring.

Sourcing Hard-to-Find & Obsolete ROTORK IQ/IQT Parts

DriveKNMS specializes in the procurement and supply of discontinued and long-lead ROTORK IQ/IQT series PC boards. The IQ Mark 1 control board (43409-01) and its associated power supply (43406-01) have been out of standard production for over 15 years. Facilities that have not migrated to IQ3 hardware continue to require these boards for corrective maintenance, and OEM channels no longer provide reliable supply.

DriveKNMS sources IQ/IQT series boards through a combination of manufacturer-authorized surplus channels, decommissioned plant buybacks, and verified third-party refurbishment programs. All boards are catalogued by part number, revision level, and firmware version where applicable. For facilities requiring multi-year maintenance agreements or blanket purchase orders covering IQ/IQT spare parts, DriveKNMS offers consignment stocking arrangements to eliminate emergency procurement lead times.

Customers operating ROTORK IQ actuators in SIL-rated (Safety Integrity Level) applications should note that replacement PCBs must be validated against the original SIL certification documentation. DriveKNMS can provide traceability records and test certificates to support SIL compliance audits upon request.

Quality Control for the ROTORK IQ/IQT Range

ROTORK IQ/IQT series PC boards present specific test challenges due to their integrated backplane bus architecture and firmware-dependent self-diagnostic routines. DriveKNMS applies the following test protocol to all IQ/IQT boards prior to dispatch:

• Visual and physical inspection: Component-level examination for capacitor ESR degradation, relay contact wear, and PCB trace corrosion — common failure modes in high-humidity or H₂S-rich plant environments.
• Powered functional test: Each control board is energized on a dedicated IQ/IQT test rig replicating the actuator backplane. Processor boot sequence, EEPROM integrity, and watchdog timer function are verified.
• Torque and position signal simulation: Analog I/O boards are tested against calibrated signal sources to verify 4–20 mA linearity and zero/span accuracy within ±0.1% of full scale.
• Fieldbus communication validation: Communication daughter boards (Profibus, Modbus, FF) are tested using protocol analyzers to confirm correct node addressing, data frame integrity, and error-recovery behavior.
• Thermal cycling: Boards destined for high-temperature or outdoor installations undergo a 24-hour thermal cycle between −20°C and +70°C to screen for latent solder joint failures.
• Firmware version verification: Control boards are confirmed to carry the correct firmware revision for the customer's actuator generation before shipment.