NDB-1系列过载保护器

NDB-1系列过载保护器 NDB-1 series overload manual I. Product Overview NDB-1 series motor protectors for AC 45 ~ 60Hz, voltage of 24V to 380V power supply circuit consisting of a motor control circuit and AC contactor and other switching equipment. When the main circuit of the motor appears non-work state phase failure, overload, phase imbalance, the protector timely breaking electrical contact switch, disconnect the motor three-phase power supply, quickly and reliably protect the motor. Protection using straight-through sampling detection technology, SCR output, simple structure, easy to use, reliable, and has no power consumption, long life, no arcing during operation, etc., is ideal for motor protection electrical products. Protection in line with EN60947-1, EN60947-5, EN60204-1 standard GB14048.4 standards. Second, the main technical parameters (I), the protection function: phase protection, phase unbalance protection, stall and overload current protection. 1, phase protection: When the motor three-phase power in any one phase-phase or phase inside the motor off, the protection action lag time ?1S. 2, phase unbalance protection: When the motor's three-phase power in any two-phase operating current difference of more than (50 ? 10)%, the protection action lag time ?1S. 3, overload current protection: When the motor current reaches 1.2 times the rated to 6 times, the protector of the action lag time for 80S ~ 10S (inverse time characteristics). (Ii), the output interface Reset: Reset power control loop; reset time: (60 ? 10) S. (Iii) Working mode: continuous work style. (Iv) for the voltage range: AC24V ~ 380V / 45 ~ 60Hz. Three, NDB-1 protection selection of specifications Table I: Specifications current regulation Applicable motor range Power wire aperture control current output interface startup delay Time Remarks 5A 2.5 ~ 5A 1.5 ~ 2.5KW Φ11.5 mm 1A / 380V (AC) 5S 10S 20S (Third gear) Start delay time: Refers to the current flowing through the main circuit motor protection from zero suddenly added five times the current value is set to the time required for protection tripping. 10A 4 ~ 10A 2 ~ 5KW 20A 8 ~ 20A 4 ~ 10KW 40A 16 ~ 40A 8 ~ 20KW 80A 32 ~ 80A 16 ~ 40KW 160A 63 ~ 160A 32 ~ 80KW Φ29.6mm 320A 128 ~ 320A 64 ~ 160KW Table II: protection specifications and turns with a perforation Motor size once the perforation turns Remarks 0.5 ~ 1A (250 ~ 400W) 6 turns the user should select the appropriate motor protection according to the rated operational current of the motor needs to be protected. In exceptional circumstances, large-sized power line protection is available to increase the number of turns of the wire through the hole in the protection method is applied to protect the small power motors, the small size of the protection can be installed in the method by the current transformer secondary side, applied to protect the power of the motor. 1 ~ 1.5A (500 ~ 750W) 3 turns 1.5 ~ 2A (750 ~ 1000W) 2 turns 2A (1KW) Or more of a turn Normal operating conditions and installation conditions 1, ambient temperature: -25 ? ~ + 65 ?. 2, the operating frequency: 45 ~ 60Hz. 3, the working voltage: 24V ~ 380V. 4, the output interface load capacity: AC380V 1A, COSΦ = 0.3 ~ 0.4. 5, installation dimensions: meet JR16 thermal relay standards. 6, the installation location: installed at any angle and degree of protection IP40. Four, NDB-1 Dimensions and application circuit examples Fifth, use the instructions and safety precautions 1, as shown in the graphic operation, AC contactor to the motor through the three-phase power lines are the three wearing protective line hole, any phase sequence and protector connected in series into the AC contactor end of the secondary circuit. 2, due to the protection of the output interface is a non-contact AC solid state electronic switch, it can not use a multimeter to measure the resistance profile when tested on-off characteristics of the switch. 3. If the protection circuit for automatic control, protection action after going to restart the control loop must cut the protector of the output interface power reset, otherwise it will refuse to start. 4, when the protector duplication of work, the time interval should be greater than twice the reset time, it may cause the protection does not work properly. 5. The interface used for protection or breaking load, its capacity can not be greater than 4.4 times the provisions of this may damage protection, and cause dangerous accidents. Protection can not be used to control the DC contactors. 6, the protector of the environment should be kept clean, dry, protection may not be used in potentially explosive media, corrosive metal or destroy insulation gas, steam, electric dust and mold presence of severe environments. 7. AC contactor coil voltage is greater than the user's current 380V or greater than 2A, to be used as an intermediate relay interfaces. 8, the current protection on the tuning scale for reference only, when you use basis having to adjust the situation further.