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MEX (55) 53 63 23 31
DIST. AUTORIZADO QRO (442) 1 95 72 60

MTY (81) 83 54 10 18
ventas@industrialmagza.com

Boston Gear®
RB Series
DC Motor Speed Control
Installation and Operation
Doc. No. 19025
RB1, B, S, R
RB2, B, S, R
RB3, B, R

www.bostongear.com

®

MEX (55) 53 63 23 31
DIST. AUTORIZADO QRO (442) 1 95 72 60

TABLE OF CONTENTS
GENERAL INFORMATIONDescription
Enclosure
Ratings
Operating Conditions
Performance Characteristics
Installation and Wiring
Startup and Operation
Maintenance

MTY (81) 83 54 10 18
ventas@industrialmagza.com

PAGE

4
4
4
5
5
8
13
14

MODIFICATIONS
Full Wave Field
Half Voltage Output
Increased Acceleration Time
Limit Switch Reversing
Torque Control
Tachometer Feedback
Line Starting
TROUBLESHOOTING14
15
15
16
18
20
21
24

PARTS LIST
TABLE
1
2
3
4
5
6
7
8
9
10

2

Ratiotrol Beta Model Matrix
Operator Controls
Ratings
Speed Regulation Characteristics
Dynamic Braking Characteristics
Calibration Wires
Full Wave Field
Capacitor Values/Acceleration
Contactor Selection
Troubleshooting

Doc. No. 19025 • Boston Gear® Ratiotrol® DC Motor Speed Control

4
5
56
7
9
14
15
23
24

®

MEX (55) 53 63 23 31
DIST. AUTORIZADO QRO (442) 1 95 72 60

TABLE OF CONTENTS

MTY (81) 83 54 10 18
ventas@industrialmagza.com

FIGURE
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19

Typical Beta Enclosed Controller
Series Beta Mounting Configurations
Main Board Connections
Internal View Beta Controller
AC Power and MotorConnections
Connections Models RB! and RB2
Connections Models RB3 and RB3B
Full Wave Field
Increased Acceleration Time
Limit Switch Reversing
Limit Switch Reversing Using RCS6 Remote Control Station
Torque Control with Torque Pot Only
Torque Control with Torque Pot and Run Speed Pot
Tachometer Feedback for 7 VDC/1000 RPM Generator
Tachometer Feedback for 35-50 VDC/1000 RPM Generator
MovingCapacitor C18 for Line Start Operation
Recommended Customer Connection Diagram for Line Start Operation
RB1, RB2, RB3 Mounting Dimensions
RB1, RB2, RB3 (Types B, S, R) Mounting Dimensions

7
8
9
10
11
12
12
14
16
17
17
19
19
20
20
21
23
23
23

Run-Stop
Switch Reverse
Magnetic Reverse

26
27
28

SCHEMATICS

Doc. No. 19025 • Boston Gear® Ratiotrol® DC Motor SpeedControl

3

®

MEX (55) 53 63 23 31
DIST. AUTORIZADO QRO (442) 1 95 72 60

GENERAL INFORMATION

MTY (81) 83 54 10 18
ventas@industrialmagza.com

Description
Ratiotrol Beta controllers statically convert single-phase AC line power to regulated DC for
adjustable-speed armature control of shunt-wound and permanent-magnet motors. The controllers are Underwriters Laboratories Listed. (FileNo. 71E60208)
Enclosure
Totally enclosed, non-ventilated, constructed of rugged die-cast aluminum alloy. Gasketed,
screw fixed cover excludes contaminants. Provision for conduit entry is included top and bottom by two (2) 3/4-14 NPT tapped holes. Standard unit is easily and inexpensively convertible
to NEMA Type 3, 4 or 12.
Model Types
Table 1. Ratiotrol Beta Model Matrix

RB1

X

RB1BX

X

RB1S

X

X

X

X

115VAC
50/60 Hz

230VAC
50/60 Hz

X
X

RB1R

X

X
X

RB2

X

RB2B

X

X

RB2S

X

X

X

X

X

X

X

1/12 - 1HP

N/A

Reconnectable
Units

X

RB2R
RB3

X

RB3B

X
X

X

X

X

RB3R
* Operator controls provided by user

4

Power Source
And
Horsepower
Range

Remote (*)

Local(Integral)

Operator
Controls

Enclosed

Open Chassis

Configuration
Armature Contactor
Reversing and D.B.

Armature Switch
Reversing

Model

Unidirectional
Run-Stop

Function

Doc. No. 19025 • Boston Gear® Ratiotrol® DC Motor Speed Control

X

115VAC
50/60 Hz

X
X
X

1/12 - 1HP

230VAC
50/60 Hz

1/2 - 2HP

®

MEX (55) 53 63 23 31
DIST. AUTORIZADO QRO (442)...
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