NEx-K

Housing

• Housing and hood made of corrosion-resistant gravity die-cast aluminium
• Coated with silicon-free paint
• Colour: RAL 7032 Pebble Grey
• The motor compartment is designed as a type “d” flameproof enclosure to DIN EN 60079-1.
• Protection class 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 constant positioning times irrespective of the load
• Options:
  – Custom voltages
  – Custom frequencies

BLDC motor

• Brushless DC motor
• Constant positioning time thanks to electronic speed controller
• Wide-range input 90 V AC … 264 V AC, 120 V DC … 370 V DC
• High holding torque when operating voltage applied
• Manufacturer configured start-up and brake ramp
• ON time 100% duty cycle
• Insulation class E to VDE 0530

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, maintenance-free
• Permanently lubricated gears
• Self-lubricating sintered bronze bearing
• Encapsulated version, operates in any position

Stroke unit

• Fixing bracket made of aluminium
• Spindle and connecting rod made of stainless steel
• Spindle self-locking
• Needle bearings to absorb axial forces
• Steel and bronze materials provide 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 tension clamp terminals of the cable entry port
• Customer-side wiring outside of the flameproof housing
• Electric anti-condensate heater
• Manual reset temperature switch 80 °C

Controls

• Open/closed signal
• Options:
  – Additional potential-free contacts
  – Electronic position controller ESR-N with Profibus and USB interfaces for synchronous motors
  – Potentiometer 200 Ω … 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

• CO switches with silver-plated contacts
• Switch connections routed to terminals
• Max. switching capacity: 6 A, 250 V AC
• Options:
  – Switches with gold-plated contacts
  – Switches with positive-break contacts

Angle of rotation limited by snap-action position off switch

• With potentiometer
  – Conductive plastic potentiometer (standard) or wire-wound potentiometer (including TUV approval)
  – Multiturn potentiometer up to 10 turns
  – Gearing facilitates adapting the electrical angle of rotation of the potentiometer to the desired linear regulating distance of the actuator.
• With 4 … 20 mA transmitter
  – Gearing facilitates adapting the electrical angle of rotation of the transmitter to the desired linear regulating distance 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)

• Using a handwheel it is possible to manually adjust the position of the output shaft and valves.
• Position switch-off settings are retained during manual operation.
• 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 to switch several actuators in parallel
• Potentiometer
• Components to UL standard
• Spindle protected by bellows
• Set collars serve as external travel stops

Installation

• 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

Sichereheitsvorschriften

Ensure the device is isolated from the power supply before the hood of the flameproof encapsulated housing is opened by a skilled tradesperson in a hazardous area. It is imperative to observe the wait time stated on the rating plate!