The Schiebel ACTUSAFE CMFS(L) is a linear failsafe actuator designed to operate valves requiring linear movement, such as globe valves and gate valves. It integrates a motor, worm gear stage, planetary gear train, and ball screw to convert rotational motion into linear motion. A key feature is its built-in energy storage device (spring) that enables fail-safe functionality. In the event of a power failure or deliberate trigger, the actuator shifts the valve to a pre-defined fail-safe position using the stored energy. This design ensures that neither an initializing stroke nor resetting is required after a fail-safe stroke; the actuator is ready for operation as soon as power is restored.
Function Description
In normal operation, the actuator is driven by an electric motor (1) through a worm gear stage (2) and a planetary gear train (3). This drives the spindle nut of a ball screw (4), which converts the rotational movement into linear motion. This linear motion simultaneously tensions the spring (6), which acts as an energy storage device, and transmits motion to the valve stem (8) via a spring-loaded spindle pin (7). All gear unit components are permanently engaged, meaning there are no engaging or disengaging elements between the motor, energy storage device, and fitting shaft. When moving against the fail-safe direction, the electric motor must move both the valve and tension the spring. If the power supply to the operating current brake (5) is interrupted, the stored energy in the spring is converted into kinetic energy, forcing the actuator to move the valve to the fail-safe position. The spring-loaded spindle pin (7) dampens the stop to protect the valve seat.
The actuator's movement behavior differs between electrical and fail-safe modes. In electrical mode, when moving in the fail-safe direction, the actuator moves electrically until the adjusted electrical end position. If the end limit is travel-dependent, it stops at this point. If force-dependent, it moves electrically until the end position, then the electrical holding brake is released, and the force is built up by the tensioned spring. For force-dependent end limits, the end position should be set sufficiently before the mechanical end position to prevent valve damage. When moving counter to the fail-safe direction, the actuator moves electrically to the end position, and if force-dependent, the force is built up by the motor. In fail-safe mode, the actuator can only move in the fail-safe direction. When the electrical holding brake is released, the actuator moves against the end limit by the spring. The force in this end position is built up by the residual spring force. If a travel-dependent end limit is desired in fail-safe mode, the mechanical connection to the valve must be changed so the actuator reaches its internal end stop before the valve's end stop. The mechanical end stops are not designed for regular torque-dependent movement.
Important Technical Specifications
The ACTUSAFE CMFS(L) series offers various models with different torque and revolution capabilities:
- CM03FS(L)30_5: In fail-safe direction: 8 Nm, Counter fail-safe direction: 16 Nm. Nominal travel: 30 mm (6 revolutions), Maximal travel: 35 mm (7 revolutions).
- CM03FS(L)50_8: In fail-safe direction: 16 Nm, Counter fail-safe direction: 32 Nm. Nominal travel: 50 mm (10 revolutions), Maximal travel: 55 mm (11 revolutions).
- CM03FS(L)100_12: In fail-safe direction: 16 Nm, Counter fail-safe direction: 32 Nm. Nominal travel: 100 mm (20 revolutions), Maximal travel: 105 mm (21 revolutions).
- CM06FS(L)100_30: In fail-safe direction: 24 Nm, Counter fail-safe direction: 64 Nm. Nominal travel: 100 mm (25 revolutions), Maximal travel: 105 mm (26.25 revolutions).
- CM06FS(L)170_25: In fail-safe direction: 24 Nm, Counter fail-safe direction: 64 Nm. Nominal travel: 170 mm (42.5 revolutions), Maximal travel: 108 mm (45 revolutions).
Failsafe Brake Technical Data:
- CM03FS(L): Power: 16 W, Voltage: 24 V, Current: 0.67 A.
- CM06FS(L): Power: 21 W, Voltage: 24 V, Current: 0.875 A.
- CM12FS(L): Power: 28 W, Voltage: 24 V, Current: 1.17 A.
Operating Modes (CM03FS(L) examples):
- ON-OFF & INCHING operation (S2 - 15 minutes according to IEC 60034):
- Speed: 2.5 - 72 RPM.
- CM03FS(L)_30/5: Fmax = 8.2 kN, Favg = 5 kN.
- CM03FS(L)_50/8: Fmax = 19.4 kN, Favg = 8 kN.
- CM03FS(L)_100/12: Fmax = 16.4 kN, Favg = 12 kN.
- Life time: 10,000 cycles.
- MODULATING operation (S4 - 1,200 c/h - max. 50% DC according to IEC 60034):
- Speed: 2.5 - 36 RPM.
- CM03FS(L)_30/5: Fmax = 8.2 kN, Favg = 5 kN.
- CM03FS(L)_50/8: Fmax = 19.4 kN, Favg = 10 kN.
- CM03FS(L)_100/12: Fmax = 16.4 kN, Favg = 12 kN.
- Life time: 1,800,000 starts.
- CONTINUOUS MODULATING operation (S9 - 1,800 c/h according to IEC 60034):
- Speed: 2.5 - 20 RPM.
- CM03FS(L)_30/5: Fmax = 8.2 kN, Favg = 3 kN.
- CM03FS(L)_50/8: Fmax = 19.4 kN, Favg = 7 kN.
- CM03FS(L)_100/12: Fmax = 16.4 kN, Favg = 8 kN.
- Life time: 1,800,000 starts.
General Technical Data (ACTUSMART CM series):
- Output torque: Max. 32 Nm (CM03), Max. 64 Nm (CM06), Max. 125 Nm (CM12).
- Setting range of tripping torque: 8...32 Nm (CM03), 16...64 Nm (CM06), 32...125 Nm (CM12).
- Setting range of output speed: 2.5...72.2 min⁻¹ (CM03), 2.5...64 min⁻¹ (CM06), 2.5...70 min⁻¹ (CM12).
- Travel range: Max. 100 revs (CM03), Max. 100/300 revs (CM06/CM12).
- Reduction ratio handwheel: 2.5.
- Output resolution: About 0.25° (CM03), 0.25°/0.75° (CM06/CM12).
- Supply voltage range AC: 100...240 Vrms +/-10%, 50/60 Hz (standard versions).
- Protection class: IP67 (EN 50629).
- Ambient temperature: -25...+60°C (non-explosion-proof), -20...+40°C (explosion-proof), -40...+60°C (ex version with extended temperature range).
Usage Features
The ACTUSAFE CMFS(L) actuators are designed for ease of operation and configuration.
- Control Unit: The integrated control unit (ACTUSMART CM.V1.2) provides an interface for monitoring, control, and settings. It features a graphic display and 4 integrated LED indicator lights for status visualization. The mounting position of the control unit can be rotated in 90° steps.
- Manual Operation: If equipped with an optional handwheel, manual operation is possible. To activate, the padlock must be removed, and the coupling rod pushed into the actuator. This electrically disables the actuator, and the display shows "manual operation." The handwheel allows valve adjustment in a de-energized state. Activating manual drive disables the fail-safe function. To deactivate, the actuator must be driven to the fail-safe position by handwheel, the coupling rod pulled up, and secured with the padlock.
- End Position Setting: Electrical end positions must be reset after commissioning or dismounting the actuator. The control unit allows setting end limits (OPEN/CLOSE) and intermediate positions.
- Failsafe Speed Adjustment: The actuator is equipped with an adjustable passive eddy current brake to change the fail-safe speed. The failsafe speed is set to minimum on delivery and can be increased after mounting and testing. Adjustments require removing the cover and turning a flange with an allen key.
- Parameter Menu: A comprehensive parameter menu allows configuration of end limits, torque, speed, ramp, control, user levels, position, binary inputs/outputs, position output, step mode, positioner, PID controller, bus systems, and characteristic curves.
- User Levels: Access restrictions to parameters can be set via user levels, ensuring only authorized personnel can view or edit specific settings.
- Characteristic Curves: Optional travel-dependent torque, speed, and valve characteristic curves can be enabled and configured via SMARTTOOL software.
- Connectivity: An infrared port and Bluetooth interface are available for communication with a PC or Android device, facilitating configuration and parameter transfer.
Maintenance Features
Regular maintenance is crucial for the longevity and safe operation of the ACTUSAFE CMFS(L) actuators.
- Safety First: All maintenance work must be performed with the actuator disconnected from the power supply and in the fail-safe position. Re-connection during maintenance is strictly prohibited. For explosion-proof actuators, a specified waiting time after power-off is required before opening the cover.
- Routine Checks:
- Monitor for increased running noises.
- Operate the actuator at least every three months during long downtime periods.
- Check the fail-safe function for operating time and smoothness.
- Lubrication:
- Actuators are delivered filled with oil.
- For output types A, B, and C (DIN 3210-A, B1, B2, DIN ISO 5210), re-lubricate grease fittings every 6 months.
- The main body does not have a filling level indicator or drain plug; lubricant replacement is done via the handwheel.
- Lubricant service intervals are typically every 10,000 to 20,000 hours (approx. 5 years), depending on workload. This includes oil change, seal replacement, and checking/replacing roller bearings and worm gear assembly.
- Mixing different lubricant types is not permitted.
- Sealing Elements: Check cable glands annually for tightness. If visual inspection indicates damage or aging of sealing elements, they must be replaced with original spare parts or comparable quality.
- Silica Gel: Remove silica gel from the alarm cover during commissioning.
- Troubleshooting: The actuator stores up to 500 history entries, which can be viewed with SmartTool2 for error analysis.
- Training: Schiebel recommends engaging only qualified personnel for installation and adjustments. Training can be provided at the factory upon special request.
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