Cleanroom Equipment Spare Parts

FFU Speed Controller

A compact panel-mounted controller that gives operators direct, stepless airflow adjustment for compatible EC-motor fan filter units.

Stepless Manual Adjustment
EC Fan Signal Control
Compact Panel Mounting
Serviceable Screw Terminals

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Product Introduction

The FFU speed controller provides a local setpoint for a compatible electronically commutated fan motor. Turning the front potentiometer varies the low-voltage command used by the motor electronics, allowing commissioning or maintenance personnel to trim airflow without replacing the FFU drive. The molded enclosure protects the control components, while mounting ears and a removable screw terminal block simplify installation near the fan housing or inside a control compartment. Signal range, terminal assignment and minimum-speed behavior must be matched to the existing motor or FFU control card.

Key Features

Rotary potentiometer gives smooth local adjustment across the usable FFU airflow range.

Low-voltage signal architecture is suited to EC fans that accept an analog speed command.

Front status indication provides a quick visual check that the control circuit is energized.

Screw terminals and external mounting tabs support straightforward replacement and servicing.

Customer Product Concerns

A replacement speed controller must produce the signal expected by the installed motor and fit the existing wiring and mounting arrangement.

The new controller uses a signal range that the existing EC motor cannot interpret correctly.The controller is selected to match the motor's specified analog command range and reference supply.

Airflow falls below the stable operating point at the lowest dial position.Minimum-speed behavior can be matched or preset to preserve the required lower airflow limit.

Different terminal assignments create wiring errors during field replacement.Terminal count, signal common, reference voltage and command output are verified against the original connection diagram.

The control cannot be secured near the FFU without modifying the housing.Mounting-tab geometry and enclosure orientation can be configured for the available service space.

Typical Applications

Single FFU airflow commissioningCleanroom ceiling fan filter unitsLaminar-flow workstation fansLocal EC fan maintenance control

Technical Parameters

Typical construction ranges for compact manual FFU speed controllers are shown below.

Core Material	Flame-retardant PC/ABS enclosure with FR-4 control board and copper-alloy terminals
Panel Thickness	35-70 mm nominal enclosure depth
Effective Width	70-135 mm nominal mounting width
Maximum Length	Up to 160 mm overall length including mounting tabs
Steel Facing Thickness	0.8-1.5 mm equivalent terminal-clamp and internal bracket thickness
Core Density	1050-1250 kg/m³ for molded PC/ABS enclosure material
Thermal Conductivity	0.18-0.25 W/(m·K) for molded enclosure material
Surface Finish	Fine-textured matte-black housing with white dial marks, green indicator and green terminal block
Joint Type	Six-position screw terminal connection with bolted external mounting tabs
Customization	Available based on the intended application and operating environment.

Available Options

0-10 V or matched potentiometer interfaceMinimum-speed presetAlternative terminal assignmentCustom mounting-tab geometry

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