QNC(QNFX)-65 Star-short-circuiting Contactor

1. Application

The QNC(QNFX)-18A to 75A series star-short-circuiting contactors are suitable for use in circuits with an AC supply frequency of 50Hz (or 60Hz), a rated insulation voltage of 690V, a rated operational voltage up to 660V, and a rated operational current of 18A to 75A at 380V under AC-3 duty. This product is primarily used in the main circuit control system of elevators to control the starting and running of permanent magnet synchronous traction motors. It can short-circuit (star-short) the three-phase power supply of the motor when the circuit is de-energized, preventing the elevator car from drifting. The product also features an output star-short-circuiting detection signal, used to determine whether the contactor has achieved the star-short-circuiting function. The star-short-circuiting contactor features AC or DC control, low noise and low power consumption during operation, and outputs a detection signal during star-short-circuiting. It can be used in elevator control systems and various civil equipment, making it the preferred product in the elevator industry. The QNC(QNFX) series integrated star-short-circuiting contactor is suitable for use in the main circuit systems of elevators with speeds below or equal to 2.5m/s and traction motor power between 5.5~30KW. Product design complies with standards: IEC/EN 60947-4-1, GB/T 14048.1, GB/T 14048.4.

2.Coding

3.Key Points

■ Performance Features ▲ Control methods include: AC control and DC control; ▲ The product features anti-replacement function: By installing a pulse module, pulse signals are sent to the main control board to effectively identify whether the contactor is in the star-short-circuiting state. Sending pulse signals with different values can identify the current rating of the star-short-circuiting contactor, preventing it from being replaced with a contactor of a different rating.

■ Magnetic System Features ▲ This product's electromagnetic system features a magnetic latching design. The coil control is energy-saving type, controlled by a circuit board. The coil holding power consumption after the contactor pulls in is ≤3W. After the coil is de-energized, the coil power is cut off following a delay via electronic circuitry. This delay time can be set according to the actual needs of the elevator manufacturer. The setting of the NO/NC contact transfer time effectively ensures the characteristic that the NC contacts close for star-short-circuiting only after the NO contacts have opened.

■ Structural Features ▲ The operating mechanism is direct-acting; contacts are double-break. ▲ The product has a three-dimensional layout structure with combination functionality; auxiliary contact blocks and pneumatic timing heads can be added on top. ▲ Features foolproof installation positioning design to avoid the risk of reverse installation of the contactor. ▲ The end cover and housing can only be assembled in one direction, preventing reverse installation of the end cover. ▲ The upper housing and lower base can only be assembled in one direction, preventing reverse installation of the contact system. ▲ Foolproof base during screw installation: there are two mounting holes on the upper part of the base and one mounting hole on the lower part, preventing reverse installation of the entire unit.

4. Operating and Mounting Conditions

■ Normal Operating Conditions ▲ Ambient air temperature: -25°C to +60°C; ▲ Ambient humidity: Maximum relative humidity 85%; ▲ Altitude at installation site not exceeding 3000m; ▲ Pollution degree at the contactor installation site: Degree 3. ■ Mounting Conditions ▲ Contactor installation category: Category III; ▲ Inclination of the mounting surface relative to the vertical plane: Not more than ±5°; ▲ The contactor can be mounted on 35mm DIN rail or by screws. ■ Torque Applied to Terminal Screws

5. Contactor Product Specifications

■ This series is divided into two frame sizes based on current rating: QNC(QNFX)-18, 25, 32 belong to one frame size; QNC(QNFX)-40, 50, 65, 75 belong to another frame size. ■ Coil control voltage: AC/DC: 24V, 48V, 110V, 220V. ■ Contact configuration: Main contacts: 3 Normally Open (3P). Auxiliary contacts: 2NO+2NC (3P+2NO+2NC) or 3NO+1NC (3P+3NO+1NC).

6. Technical Parameters

7. Pulse Module Interface Description with Elevator Control System

■ Pulse Module Description The integrated star-short-circuiting contactor has a built-in pulse module. Different current ratings correspond to different pulse widths and periods to distinguish products of different ratings. The integrated star-short-circuiting contactor periodically outputs PWM pulse signals for the elevator control system to identify, determining the in-service status of the corresponding contactor. If the elevator control system does not detect the corresponding pulse signal after issuing a control output or repeatedly receives incorrect signals (signals with pulse width/period inconsistent with the product specification), the elevator control system will issue a command to stop the elevator and bring the car to a leveling position. The pulse module output is an active signal. Upon initial power-up, it immediately outputs a set of 20 cycle signals for the elevator control system to determine the in-service status of the corresponding contactor. Subsequently, every 1 hour, the pulse module outputs a set of 20 cycle signals. This pulse module must be connected to the DC24V+ power terminal by the elevator control system for reliable detection of the PWM pulse signal. ■ Pulse Module Port Wiring Identification

■ Star-short-circuiting Signal Interface Description with Elevator System The elevator control system reserves an input point to periodically (frequency determined by the system) receive the PWM pulse signals from the integrated star-short-circuiting contactor. The elevator control system checks the pulse signal once every 12 hours, with each detection lasting more than 1 hour. If the corresponding pulse signal is not detected cumulatively over 24 hours, or incorrect signals (signals inconsistent with the product specification) are received at least twice cumulatively, the elevator reports a fault, stops after the fault, and brings the car to a leveling position. The elevator control system must ensure this detection function remains enabled during normal elevator operation and is not manually disabled or canceled. The wiring diagram between the elevator control system and the pulse module is shown below:

8. Outline and Mounting Dimensions

QNC(QNFX)-65

9. Wiring Diagrams

    QNC(QNFX)-1822～7522（2NO+2NC）           QNC(QNFX)-1831～7531（3NO+1NC）

10. Ordering Information

■ Please specify the full name, model, control coil voltage and type (AC/DC), and order quantity of the contactor. Example: QNC(QNFX)-2522 AC220V 50Hz, 20 units; This indicates a star-short-circuiting contactor with a rated current of 25A, main contacts 3NO+3NC, auxiliary contacts 2NO+2NC, coil control voltage AC220V, 50Hz, order quantity 20 units. ■ Products with special control voltage specifications can be specially ordered upon user request.