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.
}
}
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”.

10
TRIMPOT FUNCTION ADJUSTMENT
1. TURN DRIVE POWER OFF!!
2. Connect DC Voltmeter: + to +ARM, - to -ARM.
3. Set meter voltage range: (90VDC or 180VDC).
4. Turn power on. Set speedpot at 100%.
5. Adjust MAX trimpot to rated motor armature
voltage as shown on meter.
NOTE: A tachometer or strobe may be used in
lieu of a meter. Follow preceding steps, except
adjust MAX trimpot to rated motor base speed
indicated by tachometer or strobe.
1. Set speedpot to zero (fully CCW).
2. Rotate MIN trimpot CW until motor rotates.
3. SlowlyrotateMINtrimpotCCWuntilmotorstops.
NOTE:Ifmotorrotationatzeroisdesired,rotate
MINtrimpotCWuntildesiredminimumspeedis
reached.
1. Set speedpot at 50%.
2. Observe motor speed at no load condition.
3. Apply a full load to the motor.
4. AdjustIR COMP trimpot CWtoobtain the same
motor speed as with no load.
1. TURN DRIVE POWER OFF !!
2. Connect a DC ammeter between A1 on the
motorand+ARMonthecontrol.Thisisinseries
with the motor.
3. Turn power on.
4. Set speedpot at the 50% position.
5. Set CUR LIM trimpot fully CCW.
6. Apply friction braking to the motor shaft until
motor is stalled (zero RPM).
7. While motor is stalled, set current at 125% of
rated nameplate motor armature current by ad-
justing the CUR LIM trimpot.
1. CW rotation increases time of acceleration.
MAX
MIN
I.R.
COMP.
CUR.
LIM.
ACCEL
SETS MAXIMUM MOTOR
SPEED when speedpot is
setat maximum(100%rota-
tion CW). CW rotation of
MAX trimpot increases
maximum motor speed.
SETS MINIMUM MOTOR
SPEED when speedpot is
set at zero. CW rotation will
increase minimum motor
speed.
CALIBRATES SPEED REG-
ULATION - Provides a
means of improving motor
speed regulation in the ar-
mature feedback mode. If a
slowdown due to load
changes is of no concern,
rotate this trimpot fully
CCW.
LIMITS DC MOTOR ARMA-
TURECURRENT(Torque)to
prevent damage to the mo-
tor or control. The current
limit is set for the rated mo-
tor current. CW rotation of
this trimpot increases the
armature current (or torque
produced).
ALLOWSADJUSTMENTOF
ACCELERATION by user.
TRIMPOT ADJUSTMENT PROCEDURE

1/4
1/3
1/2
3/4
1.0
1/4
1/2
3/4
1.0
1.5
2.0
MIN MAX ACCEL I.R. C.L. H.P.
1/8
INPUT
VOLTAGE OUTPUT VOLTAGE
120VAC
120VAC
120VAC
120VAC
120VAC
240VAC
240VAC
240VAC
240VAC
240VAC
240VAC
120VAC
0-90VDC
0-90VDC
0-90VDC
0-90VDC
0-90VDC
0-180VDC
0-180VDC
0-180VDC
0-180VDC
0-180VDC
0-180VDC
0-90VDC
MIN MAX ACCEL I.R. C.L. H.P. INPUT
VOLTAGE OUTPUT VOLTAGE
* THESE SETTINGSAPPLY WHEN USING A 5000 OHM MASTER SPEEDPOT.
* THIS TRIMPOT CHART ISAPPROXIMATE. USE IT IN CONJUNCTION WITH
THE ADJUSTMENT PROCEDURES.
SPEEDMASTER TRIMPOT SETTING CHART
11

The Common of the SPDT switch is connected to
control pot HI and is switched between Speedpot
Hi and the Inhibit pin (P2). To inhibit (stop motor),
speedpot HI is closed to the Inhibit pin. To restart,
the switch is returned to Speedpot Hi. NOTE: The
control will stop fast and soft start through a fixed
acceleration range.
Two pot operation is done using two 10K
ohm speed potentiometers in parallel (both
HI's to P1-3, both LO's to P1-1). The
WIPER is switched using a SPDT switch.
TWO SPEED OPERATION A DPDT switch is used to inhibit the control and to connect the
DBR. Typical values for the DBR (dynamic brake resistor) are 5
ohms for 120V, 10 ohms for 240V (both 35W to 50W). Note that
motor horsepower, inertia, and cycle time effect sizing of the DBR.
NOTE: This modification cannot be used with the -17B option.
DYNAMIC BRAKING
The customer supplied SPST switch is connected
in series between the speedpot HI (P1-3) and the
Inhibit pin (P2). To inhibit, speedpot HI is closed to
the Inhibit pin. To restart, the switch is returned to
open. NOTE: The control will stop and start fast,
accel is bypassed.
INHIBIT (USED INDEPENDENTLY) INHIBIT (USED WITH SPEEDPOT)
-2
-1
-3
P1
SPST
SPEEDPOT
INHIBIT
(P2)
WIPER
LO
HI
-2
-1
-3
P1
SPDT
SPEEDPOT
WIPER
LO
HI
Improves speed regulation to ±1/2% of base speed. Contol
goes to full output when input goes to zero, above and
beyond MAX trimpot setting
TACHOMETER FEEDBACK Allows control output to follow tachometer voltage. TACHOMETER FOLLOWER
-2
-1
P1
W
LO
HI
MOTOR DYNAMIC
BRAKE
RESISTOR
-2
-1
-3
WHI
LO WHI LO
P1
HI
SPDT
TWO 10K SPEEDPOTS
TACHOMETER
P2 INHIBIT
P1-4 -ARM
+
-
6 VDC at BASE SPEED (3 VDC at
1000 RPM for 1800 RPM MOTOR) TACHOMETER
P1-2 POT WIPER
P1-1 POT LO
+
-
12 VDC at FULL SPEED
NOTE: NEED 1% OR LESS - TACH OUTPUT RIPPLE
NOTE: Permits starting and stopping of motor without breaking AC lines. In the event of SCR failure or false
triggering, the Inhibit circuit will not stop motor.
-4
DPDT
-3
P2
INHIBIT
INHIBIT
(P2)
-5
CONTROL MODIFICATIONS
12

13
SPEEDPOT
(5K 2W)
CUSTOMER'S
MOUNTING BRACKET
DIALPLATE
2.00" dia.
LOCK
WASHER O-RING
HEX NUT
SPEEDPOT
KNOB
.437
3/8
DIA.
5/32
DIA.
SPEEDPOT LOCATOR HOLE DIMENSIONS
.500 .370 .370
1.240
1.250
.250 Dia.
SPEEDPOT DIMENSION INFORMATION
Innormaloperationthiscontrolneedsnoroutinemaintenance.Thecovermaybecleanedwith
a mild detergent. Solvent type of cleaners should not be used.
MAINTENANCE PROCEDURE

14
Motor doesn't operate
Motor stalls, or runs
veryslowlywithspeed-
pot turned fully CW
Motor hunts
Repeated fuse blowing
Motor runs but will not
stop
- blown fuse
- incorrect or no power source
- speedpot set at zero
- worn motor brushes
- low voltage
- overload condition
- worn motor brushes
- max speed set incorrectly
- too much I.R. Comp.
- motor is in current limit
- motor not pulling enough
current
- max trimpot set too high
- motor speed is above rated
speed
- low voltage
- overload condition
- worn motor brushes
- defective motor bearings
- defective electrical component
- incorrect wiring
(enclosed version)
- defective wiring
- defective component
replace fuse
install proper service
adjust speedpot CW to start
replace motor brushes
check - should be above 108V
reduce load
replace motor brushes
see ADJUSTMENT PROCEDURE
see ADJUSTMENT PROCEDURE
see ADJUSTMENT PROCEDURE
current must be greater than 150 mA D.C.
see ADJUSTMENT PROCEDURE
reduce speed
check - should be above 108V
reduce load
replace
replace
call LEESON Distributor / Representative
check TERMINAL STRIP WIRING for
correctwiringinstructions(noteACline
connection in particular)
check wiring
call LEESON Distributor/Representative
If a newly installed control will not operate, it is possible that a terminal or connection is loose.
Check to make sure that all connections are secure and correct. If the control still doesn't
operate, refer to the following chart:
PROBLEM POSSIBLE CAUSE(S) CORRECTIVE ACTION(S)
If control still will not operate, consult your LEESON Distributor or Representative.
IN CASE OF DIFFICULTY

15
SPECIFICATIONS
AC input voltage...................................................................... ±10% of rated line voltage
Acceleration.......................................................................................... 0.5 to 8.0 seconds
Amps - DC output.................................................................... 150 mA to 10.8 Amps D.C.
Controller overload capacity........................................................... 150% for one minute
Current limit trimpot range............................................................. 1.0 to 15.0 Amps D.C.
Deceleration (dependent on acceleration time setting)........... .06 to .80 second range
Dimensions and weight:
3.50
2.70
1.80
1.40
1/4
Horsepower Rating
Typical AC Amps (120VAC)
Typical Arm Amps (120VAC)
Typical AC Amps (240VAC)
Typical Arm Amps (240VAC)
4.40
3.40
2.20
1.70
1/3 6.50
5.00
3.30
2.50
1/2 9.30
7.20
4.80
3.70
3/4 13.20
10.20
6.50
5.00
1.0 -----
-----
9.70
7.50
1.5 -----
-----
12.90
9.90
2.0
ENGLISH
METRIC
5.530"
5.530"
140mm
140mm
7.250"
7.250"
184mm
184mm
3.500"
3.500"
89mm
89mm
26.80 oz.
30.80 oz.
681 gms.
782 gms.
WIDTH LENGTH HEIGHT WEIGHT 174902
174903
174902
174903
MODEL #
Drive service factor........................................................................................................ 1.0
Efficiency .......................................................................................................... 85% typical
Input frequency ............................................................................................ 50 or 60 Hertz
Max. trimpot speed range..................................................... 66% to 110% of base speed
Min. trimpot speed range................................................. 0% to 30% of maximum speed
Minimum external impedance (pot hi to pot low) .............................................. 5K ohms
Power devices ......................................................................... packaged full wave bridge
Speed control .......... via 5Kohms 2W linear potentiometer or 0-10VDC isolated signal
Speed range .................................................................................................................. 50:1
Speed regulation ................................................................................. ±1% of base speed
Temperature range.................................................. -10oto 45oC. ambient (15oto 115oF.)
Transient protection................................................................................................. G-Mov
Type ramp of accel/decel ........................................................................................... linear
TYPICAL MOTOR CURRENTS

16
C7
SPEEDMASTER PARTS PLACEMENT & LIST
RESISTORS
CAPACITORS
MISCELLANEOUS
DIODES
R1
R2
R3
R4
R5
R6
R7
R8
R9
R10
R11
R12
R13
R14
R15
R16
R17
R18
R19
R20
R21
R22
R23
R24
R25
R26
R27
R28
R29
R30
R31
R32
R33
R34
R35
R36
R37
15K 8W
2.7K
2.7K
1.2M
180K
82K
470K
15K
250K TRIMPOT (ACCEL)
5K SPEEDPOT *
10K
5K TRIMPOT (MIN)
470K
300K
5K TRIMPOT (C.L.)
4.7K
390K
4.7K
150K
1K
1K
50K TRIMPOT (MAX)
100 OHM TRIMPOT (I.R.)
.01 OHM 5W
390 OHM
390 OHM
1K
20K 1% 1/4W
10K
180K
390K
47K
470K
100K
470 OHM
91K
1 OHM
C1
C2
C3
C4
C5
C6
C7
C8
C9
C10
C11
C12
10uf 35V
.01uf 100V
.001uf 1KV
.033uf 400V
.1uf 50V
22uf 16V
.1uf 50V
.0047uf 1KV
.22uf 250V
.01uf 100V
.01uf 100V
.068uf 250V (across-the-line)
D1
D2
D3
D4
D5
D6
D7
D8
D9
D10
1N4005
1N4005
1N914B
1N5242B
L512FY131
L512FY131
L512FY131
1N914B
1N4005
1N5233B
F1
H1
JU1
JU2
P1 (-1 THRU -11)
P2
PCB
10 AMP FUSE (BUSSMAN ABC or LITTLEFUSE
314 SERIES CERAMIC FUSES)
BUSSMAN S-8201-1X FUSE HOLDER
1.75" - 16GA. SOLID INSULATED WIRE
2.50" - 16GA. SOLID INSULATED WIRE
11 POS. TERMINAL STRIP
1/4" SPADE PIN TERMINAL
A-4-1918D PRINTED CIRCUIT BOARD
Q1
P1-1
Q5
D1
D8
C6
C1
NOTES:
ALL RESISTORS 1/2W UNLESS SPECIFIED.
* CUSTOMER WIRED SPEEDPOT
R28
C5
C2
Q2
R37
Q6
R12
P1-2 P1-3 P1-4 P1-5 P1-6 P1-7 P1-8 P1-9 P1-10
R22 R9 R23 R15
D2
D9
D4
D10
R1
R29
R30
R31
R21
C10
R32
R8
R4
R17
R20
C3
R19 R27
R36
C8
R35
R2
R5
R6
R7
C9
R34
C11 R33 R18
R14
R13
D3
R11
R16
R3
R25
R26
P1-11
F1
JU2
H1
R24
JU1
(dot on side towards fuse)
GENTRON PKG.
D5, D6, D7, Q3, Q4
P2
C4
ACTIVE DEVICES
Q1
Q2
Q3
Q4
Q5
Q6
2N6027
3052 MOC
L512FY131
L512FY131
LM324N IC
275V G-MOV
C12

SPEEDMASTER SCHEMATIC
ALL RESISTORS 1/2W UNLESS NOTED OTHERWISE
Q2 .................................. 3052 MOC
Q3, Q4, D5, D6, D7 ....... L512FY131 GENTRON
Q5 .................................. LM324N IC
F1 * ................................ BUSS ABC-10 or LITTLEFUSE 314010
NOTES:
WIPER
P1-2
+12V
9
10
8
+
-
5
6
7
+
-
R30
180K
ACCEL
R9
250K
R29
10K
C10
.01uf
100V
R33
470K
R34
100K
C9
.22uf
250V
Q5-2
Q5-3
R31
390K
LO
P1-1
HI
P1-3
R35
470
OHM
MIN
R12
5K
R32
47K
REMOTE
SPEEDPOT
R10
5K
+12V
13
12
14
+
-
Q5-4
4
11
3
2
1
+
-
Q5-1
+12V
A
AC2P1-11
B
Q4
L512F
Q3
L512F R25
390 OHM
F1 *
R27
1K
R26
390 OHM
+ARM
P1-5
-ARM
P1-4
MOTOR
R19
150K
R20
1K
R21
1K
MAX
R22
50K
R17
390K
+TACH
D7
L512F
R24
.01 OHM
5W
R8
15K
-FIELD
R7
470K
R11
10K
D3
1N914B
C7
.1uf
50V
R4
1.2M
C5
.1uf
50V
R6
82K
R5
180K
C4
.033uf
400V
C2
.01uf
100V
C6
22uf
16V
R18
4.7K
R16
4.7K
R13
470K
IR COMP.
R23
100 OHM
CUR. LIM.
R15
5K
R14
300K
D5
L512F D6
L512F
B
A
Q1
2N6027
C1
10uf
35V
D4
1N5242B
D8
1N914B
R1
15K
8W
R2
2.7K
P1-6
D2
1N4005
B
D1
1N4005
A
+FIELD
P1-7
SENSE RES.
P2
AC1
P1-10
Q6
275V
G-MOV
JU1
C3
.001uf
1KV
R3
2.7K
1
2
Q2-1
3052 MOC
4
6
R36
91K
C8
.0047uf
1KV
Q2-2
3052 MOC
D10
1N5233B
D9
1N4005
C11
.01uf
100V
R28
20K 1%
1/4W
+12V
+12V
SPARE
P1-9
SPARE
P1-8
R37
1 OHM
JU2
+12V
C12
.068uf
250V
%
%
17

18
Bulletin #301 12/00