Baldor -W, Installation & Operating Manual

Page: 120 / 131

Section 1
General Information
Appendix A-5 MN715
RBA Assemblies
An RBA Assembly includes a dynamic brake transistor and resistors completely
assembled and mounted in a NEMA 1 enclosure. They are designed for EO and MO
controls. Select the RBA based on the voltage rating of the control and the dynamic
brake watt capacity required. Use Table A-3 to select the RBA assembly. If more than
4,000 watts of brake capacity is required, use a combination of RTA (DB transistor) and
RGA (DB resistor) assemblies. Refer to Section 3 “Optional Dynamic Brake Hardware”
for wiring diagram.
Table A-3 Dynamic Braking Assemblies (RBA)
MAXIMUM BRAKING TORQUE IN % OF MOTOR RATING
Cont. Catalog
HP 20 25 30 40 50 60 75 100 150V 150 200 250
Watts No.
200 90% 75% 60% 45% 36% 600 RBA2-610
GE
to
150% 125% 100% 75% 62% 1800 RBA2-1806
LTA
G
240
150% 150% 150% 115% 92% 4000 RBA2-4004
VOL
380 150% 150% 120% 90% 72% 60% 48% 36% 28% 600 RBA4-620
PUT
to
150% 150% 120% 90% 72% 60% 48% 36% 28% 1800 RBA4-1820
INP
480
150% 150% 150% 150% 150% 120% 96% 72% 56% 48% 36% 29% 4000 RBA4-4010
550 150% 150% 120% 90% 72% 60% 48% 36% 28% 600 RBA5-624
to
150% 150% 120% 90% 72% 60% 48% 36% 28% 1800 RBA5-1824
600
150% 150% 150% 150% 150% 120% 96% 72% 56% 4000 RBA5-4014