Baldor BSC 7107 DC User Manual

BSC 7107

DC Brushless Control

Installation and Operating Manual

9/97 MN1231

Table of Contents

Section 1

General Information 1-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Introduction 1-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Limited Warranty 1-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Safety Notice 1-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Precautions 1-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Section 2

Receiving & Installation 2-1. . . . . . . . . . . . . . . . . . . . . . . . . .

Receiving 2-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Physical Location 2-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Installation 2-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Control Installation 2-1. . . . . . . . . . . . . . . . . . . . . . . . . . . .

AC Power Connection 2-2. . . . . . . . . . . . . . . . . . . . . . . . .

Speed Potentiometer 2-2. . . . . . . . . . . . . . . . . . . . . . . . . .

Sensor and Motor Connections 2-4. . . . . . . . . . . . . . . . .

Reverse Operation 2-5. . . . . . . . . . . . . . . . . . . . . . . . . . . .

Power Up Procedure 2-5. . . . . . . . . . . . . . . . . . . . . . . . . .

Section 3

Adjustments 3-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Current Limit Adjustment 3-1. . . . . . . . . . . . . . . . . . . . . . . . .

Minimum Speed Adjustment 3-2. . . . . . . . . . . . . . . . . . . . . .

Adjusting Closed Loop Gain 3-2. . . . . . . . . . . . . . . . . . . . . .

Section 4

Specifications and Data 4-1. . . . . . . . . . . . . . . . . . . . . . . . . .

Specifications 4-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Dimensions 4-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Hall Signal Timing Diagram 4-2. . . . . . . . . . . . . . . . . . . . . . .

Table of Contents i

ii Table of Contents

Section 1
General Information

Introduction

Baldor Series BSC 7107 control is a general purpose brushless DC
motor control. This control commutates power into standard 3-phase
brushless (BLDC) motors.

The control input line voltage is 120 VAC ± 10%. This control provides
up to 7 amperes of continuous current to the motor. Motors with Hall
sensor spacings of 60 and 120 degrees can be used.

The control has two PC boards-an upper and a lower, connected by
ribbon cable. A 10-position terminal strip on the upper board connects
the control to the motor sensors, the speedpot, and the forward/reverse
control switch (optional). The control’s upper board also carries the
trimpots for minimum speed, maximum speed, and current limit, as well
as a means for selecting the sensor spacing.

STANDARD FEATURES

S Closed loop control
S Quiet 15KHz PWM switching frequency
S MOSFET power devices
S Forward/Reverse direction control
S 5KΩ speedpot with leads, knob and dial for remote mounting
S Internal +6.25 VDC for motor hall-effect sensors
S Anodized chassis mount heatsink

General Information 1-1

Limited Warranty

For a period of one (1) year from the date of original purchase,
BALDOR will repair or replace without charge controls and
accessories which our examination proves to be defective in
material or workmanship. This warranty is valid if the unit
has not been tampered with by unauthorized persons,
misused, abused, or improperly installed and has been used in
accordance with the instructions and/or ratings supplied.
This warranty is in lieu of any other warranty or guarantee
expressed or implied. BALDOR shall not be held responsible
for any expense (including installation and removal),
inconvenience, or consequential damage, including injury to
any person or property caused by items of our manufacture or
sale. (Some states do not allow exclusion or limitation of
incidental or consequential damages, so the above exclusion
may not apply.) In any event, BALDOR’s total liability,
under all circumstances, shall not exceed the full purchase
price of the control. Claims for purchase price refunds,
repairs, or replacements must be referred to BALDOR with
all pertinent data as to the defect, the date purchased, the task
performed by the control, and the problem encountered. No
liability is assumed for expendable items such as fuses.

Goods may be returned only with written notification
including a BALDOR Return Authorization Number and any
return shipments must be prepaid.

1-2 General Information

Safety Notice

This equipment contains voltages that may be as great as 1000 volts!
Electrical shock can cause serious or fatal injury. Only qualified
personnel should attempt the start-up procedure or troubleshoot this
equipment.

This equipment may be connected to other machines that have rotating
parts or parts that are driven by this equipment. Improper use can
cause serious or fatal injury. Only qualified personnel should attempt
the start-up procedure or troubleshoot this equipment.

PRECAUTIONS

WARNING: Do not touch any circuit board, power device or

electrical connection before you first ensure that power has
been disconnected and there is no high voltage present
from this equipment or other equipment to which it is
connected. Electrical shock can cause serious or fatal
injury. Only qualified personnel should attempt the start-up
procedure or troubleshoot this equipment.

WARNING: Be sure that you are completely familiar with the

safe operation of this equipment. This equipment may be
connected to other machines that have rotating parts or
parts that are controlled by this equipment. Improper use
can cause serious or fatal injury. Only qualified personnel
should attempt the start-up procedure or troubleshoot this
equipment.

General Information 1-3