Leeson SPEEDMASTER Instruction Manual

TM

SPEEDMASTER

Variable Speed

D.C. Control

INSTRUCTION MANUAL

This Book Covers Speedmaster Control

Numbers 174902 & 174903

TM

LEESON ELECTRIC CORPORATION

GRAFTON, WI 53024-0241 U.S.A. TELEPHONE [phone] FAX [phone]

TABLE OF CONTENTS

WARRANTY ........................................................................................................................... 2

INTRODUCTION..................................................................................................................... 3

COMMONLY ASKED QUESTIONS ....................................................................................... 3

CONTROL FEATURES .......................................................................................................... 4

DIMENSIONS & MOUNTING ................................................................................................. 5

MODEL SELECTION.............................................................................................................. 6

WIRING PROCEDURE ........................................................................................................... 6

CUSTOMER FUSING .............................................................................................................. 6

TERMINAL STRIP WIRING.................................................................................................... 7

HOOK-UP DIAGRAMS........................................................................................................... 8

START-UP & ADJUSTMENTS............................................................................................... 9

TRIMPOT ADJUSTMENT PROCEDURE............................................................................. 10

TRIMPOT SETTING CHART ................................................................................................ 11

TWO SPEED OPERATION .................................................................................................. 12

DYNAMIC BRAKING............................................................................................................ 12

TACHOMETER FEEDBACK ................................................................................................ 12

TACHOMETER FOLLOWER ............................................................................................... 12

INHIBIT INSTRUCTIONS ..................................................................................................... 12

SPEEDPOT DIMENSION INFORMATION ........................................................................... 13

MAINTENANCE PROCEDURE............................................................................................ 13

IN CASE OF DIFFICULTY.................................................................................................... 14

SPECIFICATIONS ................................................................................................................ 15

PARTS PLACEMENT & LIST .............................................................................................. 16

SCHEMATIC DIAGRAM....................................................................................................... 17

1

LIMITED WARRANTY

A. WARRANTY: LEESON Electric Corporation warrants that their products will be free

from defects in material and workmanship for a period of one (1) year from date of shipment
thereof. Within the warranty period LEESON Electric will repair or replace such products
which are returned to LEESON Electric or to the nearest Branch Office, with shipping
charges prepaid. At our option, all return shipments are F.O.B. LEESON Electric or its
Branch Office. This warranty will not apply to any product which has been subjected to
misuse, negligence; or misapplied; or repaired by unauthorized persons; or improperly
installed. LEESON is not responsible for removal, installation or any other incidental
expenses incurred in shipping the products to or from the repair point.

B. DISCLAIMER: The provisions of paragraph 'A' are LEESON'S sole obligation and
exclude all other warranties of MERCHANTABILITY or use, express or implied. We further
disclaim any responsibility whatsoever to the customer or to any other person for injury to
person, or damage to or loss of property of value, caused by any product which has been
subjected to misuse, negligence or accident; or misapplied; or modified or repaired by
unauthorized persons; or improperly installed.

C. LIMITATION of LIABILITY: In the event of any claim for breach of any of LEESON'S
obligations, whether express or implied, and particularly in the event of any claim of the
warranty contained in paragraph 'A', or any other warranties, express or implied, or claim
of liability, which might, despite paragraph 'B', be decided against us by any lawful authority,
LEESON Electric shall under no circumstances be liable for any consequential damages,
losses or expenses arising in connection with the use of, or inability to use, our product for
any purpose whatsoever. An adjustment made under the warranty does not void the
warranty, nor does it imply an extension of the original one (1) year warranty period.
Products serviced and/or parts replaced on a no charge basis during the warranty period
carry the unexpired portion of the original warranty only.

If for any reason any of the foregoing provisions shall be ineffective, the Company's liability
for damages arising out of its manufacture or sale of equipment, or use thereof, whether
such liability is based on warranty, contract, negligence, strict liability in tort or otherwise,
shall not in any event exceed the full purchase price of such equipment.

Any action against the Company based upon any liability or obligation arising hereunder
or under any law applicable to the sale of equipment or the use thereof, must be
commenced within one year after the cause of such action arises.

2

INTRODUCTION

• LEESON'S Speedmaster variable speed DC motor control is a versatile, general purpose
control rated to 2 HP.

• The Speedmaster model has a dual voltage input (may accommodate either 120 or 240 VAC).
It is available with an adjustable HP range of 1/8 thru 1 HP for 120 VAC, and 1/4 thru 2 HP
for 240 VAC input.

• The control is designed for DC Permanent Magnet motors.

• Incoming AC voltage is also converted to adjustable full wave rectified DC voltage (via a
packaged bridge) to operate the DC motor.

• The control incorporates transient voltage protection with adjustable current limit and an AC
fuse for protection. It features adjustable minimum and maximum speeds along with adjust­able acceleration and IR Compensation. Tach feedback is accomplished thru a connection
to a pin (P2) on the printed circuit board.

• The Speedmaster Series has a linear acceleration/deceleration ramp.

• The control also has a barrier type terminal strip for all power and control wiring.

• The enclosed model uses a gasketed cover assembly that is rated NEMA 4/12.

COMMONLY ASKED QUESTIONS

Q. CAN I RUN TWO OR MORE MOTORS FROM THE SAME DRIVE?

A. Not recommended. The IR Comp (regulation) and Current Limit would have problems

sensing the different load on each motor.

Q. CAN I CHANGE THE HORSEPOWER OF MY MOTOR AND STILL USE THE SAME

CONTROL?

A. Yes, provided you do not deviate outside the horsepower range for the input voltage you

are using. The trimpots would need to be readjusted; see TRIMPOT CHART on page 11
for approximate settings.

Q. CAN I START AND STOP THE SPEEDMASTER WITHOUT BREAKING AC LINES?

A. Yes. Use the inhibit wiring instructions on page 12.

Q. CAN I USE THE SPEEDMASTER TO FOLLOW A VOLTAGE OR AS A TACH

FOLLOWER?

A. Yes, the signal must be ungrounded. See TERMINAL STRIP on page 7.

Q. CAN I USE A MOTOR WITH A 90 VOLT ARMATURE WITH 240 VAC INPUT?

A. Not recommended. Motor or control damage could result from peak voltages.

3

CONTROL FEATURES

MIN. SPEED (minimum speed) - Allows adjustment of the motor speed when the speedpot

is set at minimum (CCW). This permits the user to eliminate the “deadband” on the main speed
control permitting zero calibration. Clockwise rotation of “MIN” trimpot increases minimum
motor speed.

MAX. SPEED (maximum speed) - provides for adjustment of the motor speed when the
speedpot is set at maximum (CW). This permits the user to eliminate the top end “deadband”,
which will provide full speed at maximum rotation. Rotation of the “MAX” trimpot in the clockwise
direction increases the maximum motor speed.

ACCEL (acceleration) - allows adjustment of the motor acceleration from a minimum of 0.5
seconds to approximately 0.8 seconds. The deceleration time depends on the ACCEL setting.

I. R. COMP (speed regulation) - adjusts the control output to compensate for speed changes
caused by varying motor loads. As the motor load is increased, I.R. COMP increases the
voltage output of the control. Clockwise rotation of the “I.R. COMP” trimpot will increase
compensation.

CUR. LIM. (current limit) - provides protection from excessive armature current by limiting the
maximum armature current the control can provide. This enables adjustment of the maximum
torque the motor can deliver. Current limit adjustment (CUR LIM) is set at 125% of the rated
motor current (torque) based on horsepower. Clockwise rotation of the “CUR LIM” trimpot
increases the current (torque) the control will provide.

INHIBIT TERMINAL PIN (P2) - allows the user a choice of stopping and starting hard (fast) or
stopping hard with a soft start through an adjustable acceleration ramp, without breaking the
AC lines (see page 12).

TERMINAL STRIP - allows for connection of AC lines, motor leads, motor field (if needed), and
speed potentiometer.

WARNING

AT NO TIME SHOULD CIRCUIT CONTINUITY

BE CHECKED BY SHORTING TERMINALS WITH

A SCREWDRIVER OR OTHER METAL DEVICE

4

DIMENSIONS

Allow 3.50" for height clearance, 7.40" for overall length.

7.000

5.500

7/32 SLOTS (4)

TYP. .350 DEEP

.750

5.530

CAUTION: DO NOT MOUNT CONTROL WHERE AMBIENT TEMPERATURE IS OUT
SIDE THE RANGE OF -10o C. (15o F.) TO 45o C. (115o F.)

5.125

MOUNTING

1. Four 7/32" diameter slots are provided for control mounting.

2. The chassis of the control can be used as a template.

3. Use standard hardware to mount.

4. Two threaded holes (1/2" NPT) are provided on the bottom side endplate near the
terminal strip to facilitate wiring.

WARNING

1. Be sure the control housing is properly grounded.

2. Arm connections must not be switched or broken while the control is on. Serious
damage may result.

3. For non-speedpot applications, the input connections to the Lo-Wiper-Hi leads
must not be grounded. Serious control damage may result from a grounded input.

5