Siemens ACVATIX SQS65 Actuator

Siemens ACVATIX SQS65 Electromotoric Actuator

The Siemens ACVATIX SQS65 actuator is a very precise electro-motoric actuator for the actuation of tiny valves and Combi-valves in demanding heating, ventilation, air conditioning (HVAC) and light industrial applications. The SQS65 series is designed for outstanding dependability and stability and has a high-performance synchronous motor and sophisticated electronic control system. This allows precise positioning for the modulation of control loops to provide stability in fluid temperature, pressure and flow rate (Mamur et al., 2017).

The actuator is housed in a rugged, flame-retardant plastic housing and a die-cast aluminium base, capable of withstanding the continuous temperature cycling and vibrations found in mechanical rooms and industrial platforms. This allows for automated stem position tracking with low operating backlash, making it an important component for energy-efficient fluid management.

Key Features

1. Advanced Modulating Control – Receives standard continuous DC 0…10 V or DC 2…10 V position signals and provides high-resolution fluid control (Mamur et al., 2017).
2. Robust Mechanical Design: Built with a robust die-cast aluminium base, and a flame retardant glass fibre reinforced plastic casing.
3. Intelligent Stroke Calibration Automatic calibration function for dynamic detection of the valve stroke ends, protection of the internal drive train and valve seat against mechanical overload.
4. Integrated Emergency Safety Some variants have a spring return safety that drives the valve to its safe default position in the event of a power failure.
5. Manual Override & Visual Indicator: Has a manual adjustment knob with a clear position window for simple local maintenance, commissioning and manual troubleshooting.

Technical Specifications

Manufacturer Part Numbers (MPN) & Cross-References:

• Siemens SQS65.00: Base model, modulating DC 0…10 V control, without safety spring-return.
• Siemens SQS65.05: Premium variant, modulating DC 0…10 V control, featuring an integrated mechanical safety spring-return mechanism.
• Siemens SQS65.25: Fast-running modulating variant with safety functionality.
• Cross-Reference Numbers: SQS65-00, SQS65-05, SQS65, BPZ:SQS65.00, BPZ:SQS65.05.

Compatibility

The SQS65 actuator is directly compatible with the following Siemens ACVATIX valve lines:

• Small Valves: VVP45…, VXP45…, VMP45… (DN15 to DN25 sizes)
• Combi-Valves (PICV): VPP46…, VPI46…
• Valves with 5.5 mm Stroke: VVG44…, VXG44…

Installation Guide:

When retrofitting an SQS65 in marine auxiliary spaces or crowded plant rooms, always pay close attention to its installation orientation. While it is rated IP54, mounting the actuator completely upside down is an open invitation for gravity-fed pipe condensation to run straight down the valve stem and collect inside the actuator gear casing. Always mount it horizontally or vertically upright.

Furthermore, when wiring the AC 24 V power supply on long cable runs from a centralized PLC panel, calculate your voltage drop carefully. A drop below 19.2 V AC causes erratic calibration behaviors and positioning hunting, which wears out the internal synchronous motor prematurely