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Rotork IQ Series Electric Actuator: Terminal Wiring, Infrared Setter Commissioning & Troubleshooting

source： date：2026-09-29

The Rotork IQ series is a widely used non-intrusive smart electric actuator with IP68 protection. Commissioning is done via an infrared setter — no need to open the electrical compartment. Based on the IQ actuator manual (Publication E120C), this article covers terminal wiring for the on-off and modulating versions, travel/torque limit setting, and common fault remedies.

On-Off Type Terminal Wiring

Terminal	Function	Description
1、2、3	Three-phase supply L1、L2、L3	380VAC, phase order irrelevant
E	Earth terminal	Protective earth, must be reliably connected
4(-)、5(+)	24V DC control power	Internal regulated output for external control circuits
5、33	Close command input (CLOSE)	Remote close signal, to DCS/PLC DO card
5、34	Remote stop/hold	Remote stop signal
5、35	Open command input (OPEN)	Remote open signal, to DCS/PLC DO card
6、7	Valve fully-closed feedback	Passive closed-limit contact, to DCS/PLC DI card
8、9	Valve fully-open feedback	Passive open-limit contact, to DCS/PLC DI card
42、43	Fault feedback	Fault signal
10、11	Remote-control signal	Remote signal

Wiring notes: for on-off valves, jumper internal supply 4 to 36; jumper 5 to 34 for pulse signals, no jumper for maintained signals.

Modulating Type Terminal Wiring

Terminal	Function	Description
1、2、3	Three-phase supply L1、L2、L3	380VAC, automatic phase recognition
E	Earth terminal	Protective earth, must be reliably connected
26	Analog command input +	Remote control signal, to DCS/PLC AO card
27	Analog command input -	Remote control signal, to DCS/PLC AO card
22	Analog position feedback +	Analog position feedback, to DCS/PLC AI card
23	Analog position feedback -	Analog position feedback, to DCS/PLC AI card

Wiring notes: for modulating valves, jumper 4 to 41 and 5 to 39.

Commissioning Procedure

Step 1: Pre-commissioning checks

Verify nameplate data: voltage (380V three-phase), protection rating (IP68), output torque
Check wiring: phase sequence, control signals, feedback signals, earth
Operate the handwheel to mid-position (about 50% opening)

Step 2: Travel limit setting with the infrared setter

Aim the infrared setter at the display window and press ↓ to enter the setting menu
Navigate to "LC" (close limit) and press ENTER to save the close limit
Drive the valve fully open (manually or electrically), find "LO" (open limit) and press ENTER to save
The actuator records the total turns and shows a confirmation on the display

Step 3: Torque limit setting

Select "TORQUE" in the setting menu
Set open and close torque values (as a percentage of rated torque)
Close direction is normally torque seated, ensuring tight closure
Open direction is normally travel seated, preventing overshoot

Step 4: Functional verification

Stroke the actuator fully twice locally; confirm open/close limit action
Switch to remote and verify control commands from the DCS
Check that full open/close positions match the actual valve positions; 4–20 mA position feedback reads 4 mA fully closed and 20 mA fully open

Common Faults and Remedies

Fault	Possible cause	Remedy
Actuator does not move	Phase loss; ESD not reset; interlock not satisfied	Check three-phase supply; reset ESD; check interlock circuit
Will not close / not tight	Close torque set too low; valve sticking	Increase torque appropriately; check valve mechanically
Thermal trip	Motor overload; high ambient temperature	Check torque setting; improve ventilation
Feedback deviation	Potentiometer or encoder position shifted	Re-set travel limits and recalibrate 4–20 mA output

Related reading: Universal Electric Actuator Wiring & Commissioning Guide; see also the Rotork brand column.