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Model M3575T Standard Duty Braking Transistor Customer Reference Manual ● ● Web: www.bonitron.com Tel: 615-244-2825 Email: info@bonitron.com...
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Bonitron has seen thousands of products engineered since 1962 and welcomes custom applications. With engineering, production, and testing all in the same facility, Bonitron is able to ensure its products are of the utmost quality and ready to be applied to your application.
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RIVE PTIONS In 1975, Bonitron began working with AC inverter drive specialists at synthetic fiber plants to develop speed control systems that could be interfaced with their plant process computers. Ever since, Bonitron has developed AC drive options that solve application issues associated with modern AC variable frequency drives and aid in reducing drive faults.
ESCRIPTION 2.1. Related Products ......................9 2.2. Part Number Breakdown ....................9 Figure 2-1: Example of M3575T Part Number Breakdown ............9 Table 2-1: AC Voltage Rating Codes ..................9 Table 2-2: Chassis Determination ................... 10 Table 2-3: Special Options ...................... 11 2.3.
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Table of Contents 5.3.10. Attached Drive Will Not Precharge ................24 5.4. Technical Help – Before you call ................24 6. E ....................25 NGINEERING 6.1. Ratings Charts ......................25 Table 6-1: Module Ratings ...................... 25 6.2. Watt Loss ........................26 Table 6-2: Watt Loss .......................
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1.2. URPOSE AND COPE This manual is a user’s guide for the M3575T standard duty braking transistor. It will provide the user with the necessary information to successfully install, integrate, and use the M3575T. In the event of any conflict between this document and any publication and/or documentation related to the AC drive system, the latter shall have precedence.
M3575T 1.4. YMBOL ONVENTIONS SED IN THIS ANUAL AND ON QUIPMENT Earth Ground or Protective Earth AC Voltage DC Voltage Electrical Hazard - Identifies a statement that indicates a shock or electrocution hazard that must be avoided. DANGER! DANGER: Identifies information about practices or circumstances that can lead to personal injury or death, property damage, or economic loss.
ELATED RODUCTS The model M3575T series of braking products is designed to provide resistive braking control for applications utilizing a standard AC drive with a fixed DC bus. These modules have been designed for use with remotely mounted resistive loads such as the model M3575R or M3775RK resistive load modules.
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M3575T DC C URRENT ATING The DC current rating indicates the maximum DC current level safely handled by the braking unit. This rating is represented numerically such that a value of “15” would indicate that the braking unit has a peak current rating of 15 amps DC. The RMS current rating of the unit depends on the application of the braking module.
NSTALLATION FOR HASSIS The conduit cover is an optional cover for the M3575T with current ratings 15, 30, 60, and 75A. The conduit cover option is designated by C in the part number. See Section 6.4 for conduit cover dimensions.
IRING This section provides information pertaining to the field connection of the DC bus inputs to the M3575T and M3575R resistive braking modules. Actual connection points and terminal numbers for the AC drive module will be found in the documentation provided with the drive. Be sure to review all pertinent drive and system documentation as well as the power connection notes listed below before proceeding.
The terminals marked X and Y are intended for connection of a DC link choke. If the Bonitron braking transistor is connected to the terminals marked X and Y in Figure 3-2, switching resonances caused by the DC link choke will destroy the braking transistor. If the Bonitron braking transistor is connected between X and Y, the drive will not operate.
4.1. UNCTIONAL ESCRIPTION The M3575T module controls the bus voltage of a variable frequency drive by transferring energy to a resistor. When the drive’s DC bus voltage exceeds a fixed setpoint, the dynamic braking transistor module’s control electronics turns on an IGBT transistor connecting a resistive load across the DC bus.
No adjustments are necessary for this module. All regulation points are factory adjusted, and should not be changed in the field. If your module is not functioning properly, refer to troubleshooting in Section 5 of this manual or contact Bonitron for assistance.
ATTENTION! damage! Feel free to call Bonitron any time the equipment appears to be having problems. 5.3.1. BUS LIGHT NOT ILLUMINATED This can be a normal condition in systems where DC bus power and logic control power is applied.
This usually indicates serious problems exist and reenergizing the system can cause significant or catastrophic failure! In most cases, the module will need to be returned for repair. Contact Bonitron before changing the fuse. Possible causes for a blown fuse are: ...
User’s Manual ’ 5.3.5. ONTROL EADY CONTACTS WON T CLOSE If the Status Contacts listed in Section 4.2.2.1 above will not close, this indicates one of the following conditions: Open Load – There is no load connected to the unit, or it is connected improperly.
M3575T 5.3.9. CTIVE BRAKING LIGHT STAYS ON ALL THE TIME System voltage is too high or high harmonic content is present. Check main system rectifier input AC voltage. Refer to the DC bus trigger level found in Table 2-1. The undistorted main system rectifier AC input voltage should always be less than DC bus trigger level / 1.414.
M3575T 6.2. Ratings assume losses during highest braking currents. Total heat produced will depend on the duty cycle of the braking function. Table 6-2: Watt Loss 230VAC ODEL ONTROL OWER EATSINK UMBER M3575T-L15 25 W 20 W M3575T-L30 25 W...
In these cases, the following fuses are recommended. Breakers are not recommended for overcurrent protection. Table 6-3: Recommended Fuses 230VAC 400VAC 460VAC ODEL ODEL ODEL UMBER UMBER UMBER M3575T-L15 FWP-15 M3575T-E15 FWP-15 M3575T-H15 FWP-15 M3575T-L30 FWP-30 M3575T-E30 FWP-30 M3575T-H30 FWP-30 M3575T-L60...
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M3575T Table 6-4: Maximum Inductance for DC Link Cable AXIMUM ODEL MPERAGE NDUCTANCE 3575T-x15 15 A 1000uH 3575T-x30 30 A 650uH 3575T-x60 60 A 350uH 3575T-x75 75 A 350uH 3575T-x125 125 A 750uH 3575T-x150 150 A 750uH 3575T-x200 200 A...
DC bus current. The braking current in the DC bus will be higher than the AC current absorbed from the load. Because Bonitron braking transistor modules are rated for peak current, determine the peak braking power required. 7.1.1.1. ORSEPOWER TO...
OTES The model M3575R series of resistive load modules are available in a variety of load sizes and configurations for use with the M3575T braking transistor modules or with the drive’s integral braking control module. Contact your drive distributor for more information.
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The actual load module used may vary. Refer to the drive system documentation for details on the actual load module used. Please note that the status contact within the M3575T remains CLOSED until a fault condition occurs. Fault conditions include Open Load, Over Temperature, and Transistor Failure.
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M3575T Figure 7-1: Typical Status Contact Wiring with Input Contactor...
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User’s Manual Figure 7-2: Typical Status Contact Wiring with Drive Interlock Control...
Some high power systems also include redundant or back up sections as well. Once power is applied, all Bonitron modules are designed to be connected to DC buses that have all the bus capacitors present.
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