NEx-K Linear actuator
The NEx-K linear actuator for Ex zone applications is a further development of the flameproof housing of the NEx rotary and part-turn actuator with Ex Zone 1 marking CE2004 EX II 2G Ex d IIC T6 Gb, based on IECEx certification IECEx EPS 15.0061X and ATEX certification EPS 15 ATEX 1 044 X.
NEx series linear actuators are used to precisely adjust dampers in all air-conditioning, ventilation and heating systems as well as in furnace installations, process plant engineering and other fields of industry. They are available with actuating forces of 400 N - 5000 N.
The stroke units are designed for stroke lengths of 150 - 750 mm. The technical construction mirrors that of series NEx actuators.
Datasheet
Datenblatt_NEx_K.pdf
Datenblatt_NEx_K_DC.pdf
Housing
- Housing and hood are made of corrosion-resistant gravity die-cast aluminium
- Coating with silicone-free paint
- Colour RAL 7032 Pebble Grey
- The motor compartment is designed as a type “d” flameproof enclosure to DIN EN 60079-1
- Degree of protection IP66/67
- Options:
- Custom colours
Synchronous motor
- Single-phase AC synchronous motor with permanent magnets, reversible
- 230 V ± 10%, 50/60 Hz ± 5 %
- ON time 100% duty cycle on request
- Short start/stop times
- Insulation class B to VDE 0530
- Synchronous motors maintain speed and positioning time irrespective of the load
- Options:
- Custom voltages
- Custom frequencies
BLDC motor
- Brushless DC motor
- Constant positioning time thanks to electronic speed controller
- Wide-range voltage input 90 V AC … 264 V AC, 120 V DC … 370 V DC
- High holding torque when the operating voltage is applied
- Manufacturer configured start-up and brake ramp
- ON time 100% duty cycle
- Insulation class B to VDE 0530 DC motor
DC motor
- DC commutator motor
- Voltage 12 V DC or 24 V DC
- Insulation class E to VDE 0530
Gearbox
- Spur gearing with straight-toothed steel gears
- robust, wartungsfrei
- Rugged, maintenance-free
- Permanently lubricated gears
- Self-lubricating sintered bronze bearings
Stroke unit
- Fixing bracket made of die-cast aluminium
- Spindle made of stainless steel
- Spindle self-locking
- NNeedle bearings to absorb axial forces
- Steel and bronze materials for good anti-seizure properties
Spindle
- Self-locking
- “Open/closed” markings indicate position
- Made of stainless steel
Electrical connection
- Connection by means of 1 m cable end or Ex “e” rated terminal box with spring-loaded terminals
- Customer-side wiring outside of the flameproof housing
- Electric anti-condensate heater
- Manual reset temperature switch 80 °C
Controller
- Open/close signal
- Options:
- Additional potential-free contacts
- Electronic position controller ESR-N with Profibus and USB interface for synchronous motors
- Potentiometer 200Ω … 10 kΩ
- Blocking protection by monitoring changes to the actual value of the potentiometer (only in conjunction with position controller ESR-N)
Ambient temperature
- -20 °C to +60 °C
Angle of rotation limited by snap-action position off switch
- Changeover switches with silver-plated contacts
- Switch connections routed to terminals
- Switching capacity: max. 6 A, 250 V AC
- Options:
- Switches with gold-plated contacts
- Switches with positive-break contacts
Position sensor for external position indication (optional)
- With potentiometer
- Conductive plastic potentiometer (standard) or wire-wound potentiometer (including TÜV approval)
- Multiturn potentiometer up to 10 turns
- Gearing makes it easier to adapt the electrical angle of rotation of the potentiometer to the desired angle of rotation of the actuator
- Special potentiometers with TÜV-approved form-fit attachment solution are available for electronic fuel/air ratio control
- With 4 ... 20mA transmitter
- Gearing makes it easier to adapt the electrical angle of rotation of the transmitter to the desired angle of rotation of the actuator
- With Hall sensor
- The wear-free absolute encoder that makes use of the Hall effect is particularly suitable for continuous operation in potentially explosive atmospheres
Manual operation (optional)
- The position of the input shaft and valves can be moved manually using a handwheel
- Disengaging the gear train and motor reduces the amount of force required
- Position switch-off settings are retained during manual operation
- The handwheel remains motionless during electrically powered operation
Options
- Other voltage/frequency
- Handwheel
- Additional auxiliary position switches
- Custom control cams
- Electronic position controller ESR-N (in conjunction with synchronous motor)
- Position sensor
- Relay for switching several actuators in parallel
- Potentiometer
- Components to UL standard
- Spindle protected by bellows
- Set collars serve as external travel stops
Assembly
- Easily mounted thanks to stable cast angle bracket and steel angle section attached to housing
- Connecting pin supplied to connect spindle with valve
- No-fuss coupling to valve stem by means of:
- Lever arm, clamping lever, ball-and-socket joint, connecting rods, sprung connecting rods
Safety instructions
- In a potentially explosive area, ensure the device is isolated from the power supply before the hood of the flameproof encapsulated housing is opened by a specialist. The waiting time specified on the rating plate must always be observed!