Foot Mount WEG BRAKE MOTORS Three-Phase Motors 01518EP3EBM254T 254T 11 KW

How does a brake work? In order to ensure fast and accurate stops, the system of the W22 brake motor works as follows: when the motor is disconnected from the line, the current of the brake coil is also interrupted, which makes the coil stop actuating. Then, the springs push the armature towards the motor, compressing the brake disc between the armature and the ND-endshield, thus braking the motor. Figure 1 - Scheme of the brake components. When Power is applied, the system simultaneously starts the motor and powers up the brake coil. The armature is attracted against the frame of the brake coil, overcoming the pressure of the springs and releasing the brake disc, which moves in the axial direction away from the friction surface. Thus, the braking action ceases and the motor is free to start. Electromagnet coil power supply The electromagnet coil is powered by direct current (DC) which can be supplied by a DC voltage source or bridge rectifier which converts AC to DC current. The bridge rectifier consists of diodes and varistors that filter undesirable voltage spikes and enable fast current shutdown. The direct cur- rent power supply provides higher speed and reliable brake operation. Ideal for applications that require immediate, accurate and safe stops, position control and energy saving. The W22 brake motor is suitable for many different applications, such as load elevators, hoists, shears, machining equipment, looms, packaging machines, conveyors, washing and bottling machines, bending machines, among others. Compression Spring Air gap (S L ) Armature plate ND-Endshield Brake disc Brake coil Figure 2 - Detail of the bridge rectifier inside the terminal box. If the brake coil is supplied by direct current, it must be directly connected to the brake terminals. The alternating current (AC) power supply for the bridge rectifier can be obtained from an independent source, or from the motor terminals, provided the motor is not supplied by frequency inverter. This power supply can be 220/230/240 V, 380/400/415 V, or 440/460/480 V, according to the features of the bridge rectifier/brake coil assembly. The electromagnetic coil can be operated continuously within ± 10% of its rated voltage. Three-Phase General Purpose Motors BRAKE MOTORS – Three-Phase TEFC - WEG brake motors consist of an induction motor coupled to a disc brake. Brake is of sturdy construction with few moving parts which guarantees long durability and minimum maintenance. Inverter Rated: 1000:1 for variable torque 12:1 for constant torque TEFC - High Efficiency BRAKE MOTORS – Three-Phase Three-Phase General Purpose Motors Frame structure that reduces air dispersion and improves the cooling Terminal box with greater internal space and easy handling Solid feet that simplify the motor alignment and installation Frame providing high mechanical strength and low vibration levels Optimizations of the braking system New brake The friction element of the new brake provides less wear and more safety “Interchangeable with other global brands” Guarantee of fast and accurate stops System with fewer moving parts reduces downtime for maintenance Manual release lever Motor shaft may remain free in emergency situations or when necessary Standard torques The torques are established by frame so as to provide shorter braking times Available braking torques (Mk). The braking torque must be equal to or greater than the motor rated torque. Table 5 contains the main characteristics of the brakes, using the speed of 100 rpm as reference. Features that make a difference: • 1.25 service factor • NPT Threaded terminal box • Armature type brake • Manual Release • Class F insulation (Impregnation Resin and Magnet Wire are class H) • F1 Mounted • Stainless Steel Nameplate - Laser etched with high contrast background • Regreasable ball bearings (Frames 254T and up) Standard Feature In order to obtain productivity and high performance, a company must count on reliable equipment, operating in accordance with its purpose. That is the essence of the W22 brake motor: provide the production process with synergy and agility. W22 Brake Motor: new platform, new brake, excellent performance! Featuring a new braking system, high torque and durability, the W22 brake motor is ideal for equipment that requires fast stops for safety, accurate positioning and time saving. The new brake motor introduces new characteristics in the braking system and platform, which now counts on the same innovative features that make the W22 line a great success: If separate power supply to the Brake is required, (Such as on Motors operating from Variable frequency Controller); 230V to the Brake module is mandatory, unless motor model contains “Q” (ex. 00118EP3EBMQ143T). For “Q” models, the input voltage to the Brake module is 460V AC. Brake Torques Frame N.m lb.ft 143/5T 16 12 182/4T 60 44 213/5T 125 92 254/6T 235 173 284/6T 400 295 Brake power supply. When the brake coil is powered by a bridge rectifier, the rectifier input terminals must be supplied with AC voltage. The relations between the motor voltage, the type of bridge rectifier and the brake coil power supply must be in accordance with table 8. Mounting: F2, F3 flanges, footless, vertical Degree of Protection: IP56, IP65, IP66 Frequency: 50Hz Voltage: 575 V and others DE bearing seal: W3 Seal, taconite seal, INPRO/SEAL ® Vibration level: Degree B (according to NEMA MG-1) Winding thermal protection: thermostat or thermistor Space heater Cable gland Drip cover Tropicalized internal painting Encoder Stainless steel screws Cooling method: TEBC – Totally enclosed blower cooled (IC 416) Insulation class: “H” Able to operate with variable frequency Inverter* Microswitch to monitor the air gap or brake opening (from frame 182T up) Brake power supply: 380-415 V 440-480 V 525-575 V Additional terminal box for frames 254T to 364/5T How to choose a W22 brake motor For other configurations, contact WEG. Define the braking torque. The W22 brake motor line offers up to two torques per frame: Rated torque: standard torque supplied; Determine the motor and the brake: the first step is to define the environment in which the equipment will be used so as to select the motor with the best electromechanical characteristics for the application. The type of brake must also be checked, informing the power supply and the required braking torque. Define the ambient temperature: taking into account the ambient temperature at which the motor will operate, we can determine the minimum ideal cooling system for the brake operation, according to table 3. Table 3 - Definition of the cooling system according to the motor ambient temperature. * For this condition, please contact WEG. For other cooling system configurations, contact WEG. Specify the degree of protection: the enclosures of electrical equipment, according to the characteristics and access conditions of the installation environment, must offer a certain degree of protection. Thus, equipment to be installed in a place subject to water jets, for example, must have an enclosure capable of withstanding such jets under certain pressures and angles of incidence without water ingress. Table 4 indicates the minimum cooling system necessary to ensure the degree of protection. Degree of protection Minimum cooling system of the motor IP55 No ventilation / Air Over (with fan cover) Self-ventilated With or without release lever IP56/IP65/IP66 Self-ventilated with brake protection cover Without release lever W-Easy Maintenance With or without release lever Table 4 - Degrees of protection and minimum cooling systems of the motor. Ambient temperature Minimum cooling system of the motor Up to 40°C No ventilation / W-Easy Maintenance Up to 50°C Self-Ventilated / Air Over Up to 60°C Blower cooled Up to 70°C Blower cooled* The W22 brake motor is a motor for quite specific applications that demand high safety and accuracy. Therefore, it is extremely important to take into account some criteria when choosing such equipment. For motors from the 315S / M housing, use with frequency inverter requires that measures be taken to prevent current flow through the bearings. Therefore, the starting method of the motors must always be informed in the purchase order. For the use of stock motors with frequency inverters, please consult WEG.