Rockwell Automation Reliance Electric SR3000 Instruction Manual

$R3000 Snubber Resistor Braking Kits
for 230 V and 460 V GV3000/SE Drives
230 VAC Model Number 2SR20450
460 VAC Model Number 28R40700
Instruction Manual D2- 3401
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ATTENTION: Only qualified electrical personnel familiar with the construction and
operation of this equipment and the hazards involved should install, adjust, operate,
and/or service this equipment. Read and understand this manual and other .
applicable manuals in their entirety before proceeding. Failure to observe this
precaution could result in severe bodily injury or loss oflife.
The products described in this manual are manufactured ordistributed by Reliance Electric Industrial
Company.
Product Description
The SR3000 Snubber Resistor Braking Unit connects to 230 V GV3000/SE drives of 15 HP orlarger and
460 V GV3000/SE drives. It is used to dissipate the power regenerated by the motor during rapid
deceleration or during overhauling load conditions.
The regenerated energy is normally consumed, as shownin figure 1, by mechanical loss, by the motor,
and by the drive. The remaining energy is stored in the drive's DC bus capacitor. If the remaining energy
causes the capacitor voltage to rise above the normal operating range, the Braking Unit will discharge the
regenerated energy before the drive voltage becomes excessive. Two units can be connected (paralleled)
io provide increased wait dissipation.
Wo ee ee eee eee py Dischargeof
Energy \,| Regenerated
Regenerated Energy at
by the Motor ,' |SR3000 Series
roe 1 Braking Unit
wn "F; xT - v7 , x7 Vv
x " Sy s ° os A *s "
Consumption Consumption Consumption Storage in
by Mechanical in the Motor by the Drive Capacitor of
Loss liself (approx. itself the Drive
10 to 15% of
Output}
GV3000/SE and Reliance are trademarks of Rockwell Automation.
© 1997 Rockwell International Corporation.
Figure 1 - Dissipation of Energy Regenerated by the Motor
@&® Rockwell automation
Reliance Electric