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GE 6KBU300 Braking Unit NOTE:The use of the normalized resistors reported at chapter 6 it is strongly reccomended

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6KBU300

—————— DIMENSIONING... AND CORRESPONDING... —————— 4

To calculate the value of the costant power (or rated) of the braking resistor using this graphic, it will be possible

to apply the following formula:

continuative power R =

regenerated power

overload factor

f013

Considering having to brake a 30KW motor with overload of 150%, the regenerated power will be at maximum

45KW.

Supposing a braking time of 5 seconds (overload time for the resistor) and 1 break minute, the graphic provides an

overload factor of 3,9, so the rated power of the resistor will be:

= 11.5 kW

45000

3.9

f014

NOTE:The use of the normalized resistors reported at chapter 6 it is strongly reccomended

Contents

Main Page Page Page CONTENTS Page 1. GENERAL Page 2. MAINS CHARACTERISTICS Page 1 3. TECHNICAL DATA c a1a1 a W ARNING ! BU-300 Front view CAUTION 3.2. HARDWARE SPECIFICATIONS 3.2.1. Power required 3.2.2. Internal fuses 3.2.3. Signalling LEDs 3.2.4. Terminal strip GEI-100350A Regulation board terminal strips: Maximum cable sizes for power terminals C,D,CR,BR Maximum cable sizes of the regulation section terminals 3.2.5. Dip Switches description 3.3. SELECTION OF THE INTERVENTION THRESHOLD NOTE:It is possible to select only one braking threshold at a time. 3.4. PARALLEL CONNECTION OF THE UNIT NOTE:When a very close mounting of several braking units is needed, it is necessary to keep among NOTE: 3.5. OVERTEMPERATURE ALARM. 3.6. USE OF DC LINK DISCHARGE FUNCTION 4. DIMENSIONING OF THE BRAKING UNIT AND CORRESPONDINGRESISTOR Page Page 4.1. SIMPLIFIED DIMENSIONING OF THE RESISTOR 1000 10 1 0,1 13456789 RESISTANCE POWER 2 OVERLOADFACTOR Pause time NOTE:The use of the normalized resistors reported at chapter 6 it is strongly reccomended Page 5. MINIMUM VALUE OF THE RESISTORS THAT CANBEUSED ATTENTION!! Units are not protected against direct short-circuit between terminals CR, BR. This Page 6. STANDARD BRAKING RESISTORS NOTE:the power ratings indicated with (*) have a value lightly below to the one calculated for POVL 7. EXTERNAL PANEL MOUNTED DC FUSE Page 6KBU300 BLOCKS DIAGRAM 8 8. BLOCKS DIAGRAM S1 75 BU-C 76