Leeson SPEEDMASTER User manual

SPEEDMASTER
Variable Speed
D.C. Control
INSTRUCTIONMANUAL
TM
This Book Covers Speedmaster Control
Numbers 174902 & 174903
TM
LEESONELECTRICCORPORATION
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
fromdefectsinmaterialandworkmanshipforaperiodofone(1)yearfromdateofshipment
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
excludeallotherwarrantiesofMERCHANTABILITYoruse,expressorimplied.Wefurther
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
ofliability,whichmight,despiteparagraph'B',bedecidedagainstusbyanylawfulauthority,
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.
Ifforanyreasonanyoftheforegoingprovisionsshallbeineffective,theCompany'sliability
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
3
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.
COMMONLY ASKED QUESTIONS
• LEESON'S Speedmaster variable speed DC motor control is a versatile, general purpose
control rated to 2 HP.
• TheSpeedmastermodelhasadualvoltageinput(mayaccommodateeither120or240VAC).
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 adjust-
able 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.

CONTROL FEATURES
4
MIN. SPEED (minimum speed) - Allows adjustment of the motor speed when the speedpot
issetatminimum(CCW).Thispermitstheusertoeliminatethe“deadband”onthemainspeed
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”,
whichwillprovidefullspeedatmaximumrotation.Rotationofthe“MAX”trimpotintheclockwise
direction increases the maximum motor speed.
ACCEL (acceleration) - allows adjustment of the motor acceleration from a minimum of 0.5
secondstoapproximately0.8 seconds. The deceleration timedependsontheACCELsetting.
I. R. COMP (speed regulation) -adjusts the control output tocompensateforspeed 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.(currentlimit)-providesprotectionfromexcessivearmaturecurrentbylimitingthe
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).
TERMINALSTRIP-allowsforconnectionofAClines,motorleads,motorfield(ifneeded),and
speed potentiometer.
WARNING
AT NO TIME SHOULD CIRCUIT CONTINUITY
BE CHECKED BY SHORTING TERMINALS WITH
A SCREWDRIVER OR OTHER METAL DEVICE

DIMENSIONS
5
Allow 3.50" for height clearance, 7.40" for overall length.
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
mustnotbegrounded.Seriouscontroldamagemayresultfromagroundedinput.
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.
MOUNTING
CAUTION: DO NOT MOUNT CONTROL WHERE AMBIENT TEMPERATURE IS OUT
SIDE THE RANGE OF -10oC. (15oF.) TO 45oC. (115oF.)
5.500
7.000
.750
5.125
7/32 SLOTS (4)
TYP. .350 DEEP
5.530

MODEL SELECTION
6
The Speedmaster will operate a 90 VDC motor in the H.P. range of 1/8 through 1 H.P., and a
180 VDC motor in the range of 1/4 through 2 H.P., using different trimpot settings.
1. Size all wires which carry armature or line current to handle currents AS SPECIFIED BY
NATIONAL,STATE,AND/ORLOCALCODES.Allotherwiresmaybe#18AWGorsmaller
as permitted by local code.
2. Separate control wires from all the Armature and AC line wires when routed in conduits
or in wire trays. The Speedmaster has two threaded holes (1/2" NPT) in one endplate,
located near the terminal strip, for this purpose.
WIRING PROCEDURE
The Speedmaster is provided with a fuse in AC line 1 (P1-11). This fuse is sized to open in the
event of a shorted armature or if an armature line is shorted to earth ground. As long as 120
VAC input is connected properly, there is no additional fusing needed.
For240VACapplications, an externalfusemaybeusedin AC line 2(P1-10).Thisfuseshould
be a Bussman ABC10 or LittleFuse 314-010. This added fuse will provide protection on both
AC legs to the control. If you desire not to fuse both legs, the fuse in the control will open in the
event of excessive armature currents.
AC current is desired by motor characteristics. In a small number of applications it may be
necessary to increase fuse value.
CUSTOMER FUSING
Note: The minimum current rating for this Speedmaster control is 150mA.
H.P. Input Voltage Output Voltage Unidirectional Reversing
1/8
1/4
1/3
1/2
3/4
1.0
1.5*
2.0*
* Not available with 120 VAC input - Input voltage determines maximum allowable H.P.
120/240 VAC 0-90/0-180 VDC 174902 174903
240 VAC 0-180 VDC 174902 174903

TERMINAL STRIP WIRING
The Speedmaster has an 11 position block type terminal strip for ease of connection.
P1-1 (SPEEDPOTLO)Connectstolowside(orangewire)ofthe5Kspeedpot(normallythe
CCWend).ThisinputisraisedandloweredbytheMIN.trimpot.Electronicspeedinput
(voltagefollower)maybereferencedtospeedpotLOiftheMINtrimpotadjustmentsare
tobeactive.Otherwise, inputs may be referenced to -ARM, which willbypass theMIN
trimpot. NOTE: INPUT MUST NOT BE GROUNDED!!
P1-2 (SPEEDPOT WIPER) Connects to wiper (red wire) of the 5K speedpot (center lead).
For voltage follower applications, this INPUT MUST NOT BE GREATER THAN +12
VOLTS MAXIMUM AND MUST NOT BE GROUNDED!
P1-3 (SPEEDPOTHI)Connectstohighside(whitewire)ofthe5Kspeedpot(CWend).This
is internal +12 volts. For start-stop applications, the connection between this terminal
and speedpot HI can be opened and closed by a SPST switch. See question #3 in
“COMMONLY ASKED QUESTIONS”. NOTE: INPUT MUST NOT BE GROUNDED!!
P1-4 (-ARM)Connectstominus(-)Armaturewire(A2)onmotor.Forvoltagefollowerapplic-
ations where the MIN trimpot is bypassed, connect minus (-) of the follower to this
terminal.
P1-5 (+ARM)Connectstoplus(+)Armaturewire(A1)onmotor.0-90VDCfor120VACinput
OR 0-180 VDC for 240 VAC input. See “SPECIFICATIONS” for output rating.
P1-6 (+FIELD) DONOT USEforpermanent magnetmotor.Thissupplies+Fieldvoltagefor
aSHUNTWOUNDMOTOR.RefertoFieldVoltagetable.Formotorswithdualvoltage
field (i.e. 50/100V or 100/200V), make sure highest value is connected.
FIELD VOLTAGE TABLE
VAC INPUT 120 240
VDC FIELD 100 200
P1-7 (-FIELD) DO NOT USE for permanent magnet motor. Connect minus (-) Field wire of
SHUNT WOUND MOTOR.
P1-8 VERY IMPORTANT !!! Refer to “CUSTOMER FUSING” ON PAGE 6.
P1-9 ENCLOSED VERSION: (AC) 120VAC - Connect incoming hot AC (black wire) to
P1-9andNeutral(whitewire)toP1-8.Connectground
(greenwire) to Chassis Ground,asshown in diagram
- page 8.
240VAC - Connect both hot sides, one to P1-8 and
one to P1-9. Also connect ground wire to Chassis
Ground.
P1-10 VERY IMPORTANT !!! Refer to “CUSTOMER FUSING” ON PAGE 6.
P1-11 ENCLOSED VERSION: (SWITCHED AC)NoconnectionstoP1-10andP1-11.This
is for switched AC output. Note “FACTORY WIRING”
(page8).Pilotlightscanbeconnectedbetweenthese
terminals. The voltage present at these terminals is
AC input voltage.
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7

SPEEDMASTER MODEL 174902 HOOK-UP DIAGRAM
8
SPEEDMASTER MODEL 174903 HOOK-UP DIAGRAM
BEFORE SCREWING DOWN COVER ASSEMBLY, ROUTE WIRING
THROUGH CONDUIT HOLES IN ENDPLATE BY TERMINAL STRIP.
CONNECT THE MOTOR LEADS TO P1-4 (-ARM) AND P1-5 (+ARM) AND
AC INPUT (OF PROPER VOLTAGE) TO P1-8 (AC) AND P1-9 (AC).
INSIDE OF COVER
SPEEDPOT
DPST SWITCH
(black)
ENDPLATE WITH HOLES FOR CONDUIT
(white)
(white)
-11-9-8 -10-4 -5 -6 -7-1 -2 -3
P2
Inhibit
Pin
P1
Pot Lo
Wiper
Pot Hi
-Arm
+Arm
+Field
-Field
AC AC
motor
armature ac input
field*
chassis
ground
Switched AC Switched AC
Min Max Accel I.R. Comp Cur. Lim. LO (orange)
HI (white)
WIPER (red)
(black)
P3-1 P3-2 P1-8 P1-9
P1-4 P1-5 P1-10 P1-11
AC INPUTARM INPUT
-7
-6
-3
-2
-1
P1
4PDT SWITCH
P3
-4
-11
-10
-5
-2
-1
-9
-8
ARM 1
ARM 2
AC
AC
black
white
brown
yellow
red
blue
purple
or brown
gray or
yellow
brown
yellow
purple
or brown
gray or
yellow
PERMITS REVERSING OF THE MOTOR. THIS IS ACCOMPLISHED USING A 4PDT BLOCKED CENTER SWITCH. WHEN SWITCHED
BETWEEN THE FORWARD/REVERSE POSITIONS, A DELAY IS ENCOUNTERED DUE TO THE BLOCKED CENTER POSITION,
WHICH PROTECTS THE CONTROL FROM ANY VOLTAGE THAT MAY BE AT THE TERMINAL. THE 4PDT SWITCH IS FACTORY
INSTALLED INTO THE COVER. THE TWO POSITION TERMINAL STRIP (P3) IS FACTORY INSTALLED ON THE MAIN BOARD
(ABOVE). THE OUTPUT ON P3 IS THE SWITCHED (FWD/REV) OUTPUT AND THE OUTPUT OF TERMINALS P1-4 AND P1-5 IS NOT
SWITCHED.
THE MOTOR MUST COME TO A COMPLETE STOP BEFORE CHANGING DIRECTIONS. IF THE MOTOR DOES NOT COME TO A
COMPLETE STOP, SERIOUS DAMAGE TO THE CONTROL MAY RESULT. BYPASS OF THE CENTER BLOCK OF THE SWITCH MAY
RESULT IN DAMAGE TO THE CONTROL.

START-UP PROCEDURE
9
Thetrimpotadjustments,MIN,MAX,I.R.COMP,andCURLIMarecheckedatthefactoryusing
atypicalmotorat 240 VACinput.UsetheTRIMPOT CHART on page11topresetthe trimpots
for the proper setting for your application. The remaining trimpot - ACCEL, is a variable
acceleration and should be set for your particular application.
Thetrimpotchartisapproximate.Thechartisvalidwhenusingthespeedpotora0-10/12VDC
input signal to set speed.
These adjustments are permanent; periodic readjustment is normally not needed. Operation
of the control beyond ±10% of normal line voltage could result in readjustments.
ADJUSTMENTS
WARNING:
ALL POWER MUST BE TURNED OFF BEFORE PROCEEDING !!!
1. Recheck all wiring. Accidental grounds, loose or pinched wires on armature or speedpot
wires may damage the control when power is applied.
2. Check to see that incoming service is of correct voltage.
3. Turn speedpot to zero (fully CCW).
4. Turn power on and advance speedpot while observing motor.
WARNING: POWER MUST BE OFF BEFORE STEP 5 CAN BE ACCOMPLISHED!
5. If motor rotation is incorrect, turn power off at external disconnect and reverse +ARM and
-ARM connections.
6. Check for satisfactory operation throughout the speed range.
7. If operation is satisfactory, no readjustments are needed.
8. If instability or surging is observed, or if maximum speed is higher than desired, proceed to
“TRIMPOT ADJUSTMENT”on pages 10 and 11.
9. For other problems, consult page 14, “IN CASE OF DIFFICULTY”.