Rta Assemblies - Baldor 23H Series Installation & Operating Manual

Section 1
General Information
Dynamic Braking (DB) Hardware Continued

RTA Assemblies

HP
20 150%
25 125%
30 100%
40 75%
50 62%
60
75
100
150V
150
200
250
300
350
400
450
CAT. NO. RTA2-6
Minimum 6
Ohms
A-6 Appendix
RTA assemblies include a dynamic brake transistor and gate driver circuit board
completely assembled and mounted in a NEMA 1 enclosure. Brake resistors are not
included in the RTA assembly. Each RTA assembly is designed to be used with an RGA
dynamic brake resistor assembly. The minimum resistance of the RGA assembly must
be equal to or greater than the minimum resistance specified for the RTA assembly.
Select the RTA based on the voltage rating of the control and HP which provides the
dynamic brake watt capacity required. Use Table A-4 to select the RTA assembly.
Refer to Section 3 "Optional Dynamic Brake Hardware" for wiring diagram.
Table A-4 Dynamic Braking Transistor Assemblies (RTA)
MAXIMUM BRAKING TORQUE IN % OF MOTOR RATING
208 - 230 VAC
150% 150%
150% 150%
150% 150%
115% 150%
92% 150%
RTA2-4 RTA2-2
4
150%
150%
120%
90%
72%
60%
48%
36%
28%
RTA4-20
2 20
380 - 480 VAC
150% 150%
150% 150%
150% 150%
150% 150%
150% 150%
150% 150%
96% 150%
72% 150%
56% 150%
48% 126%
36% 95%
29% 76%
62%
54%
47%
41%
RTA4-10 RTA4-4
10 4
150%
150%
150%
150%
150%
150%
150%
150%
150%
150%
150%
150%
125%
108%
94%
84%
RTA4-2
2
MN723