Minarik SL-15U User manual

User’s Manual
SL-15U
Adjustable Speed Control
for Bodine Shunt Wound
1/70 and 1/50 HP
115 VDC Motors

Copyright  2001 by
Minarik Corporation
All rights reserved. No part of this manual may be reproduced or transmitted in any form
without written permission from Minarik Corporation. The information and technical data
in this manual are subject to change without notice. Minarik Corporation and its
Divisions make no warranty of any kind with respect to this material, including, but not
limited to, the implied warranties of its merchantability and fitness for a given purpose.
Minarik Corporation and its Divisions assume no responsibility for any errors that may
appear in this manual and make no commitment to update or to keep current the
information in this manual.
Printed in the United States of America.

Safety Warnings
Note: This symbol  denotes an important safety message. Please read
these sections carefully before performing any instructions contained in this
manual.
• Have a qualified electrical maintenance technician install,
adjust and service this equipment. Follow the National
Electrical Code and all other applicable electrical and safety
codes, including the provisions of the Occupational Safety
and Health Act (OSHA), when installing equipment.
• Reduce the chance of an electrical fire, shock, or explosion
by proper grounding, over current protection, thermal
protection, and enclosure. Follow sound maintenance
procedures.
i

ii
Table of Contents
General Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1
Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2
Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3
Dimensional Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4
Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6
Alternative Wiring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8
Calibration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9
Maximum Speed and Regulation (IR COMP) Adjustment . . . . . . . . . . . . . . . . . . . . . . .9
Standard Calibration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11
Application Notes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .14
Speed Adjustment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .15
Adjustable / Maximum Speed . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .16
Multiple Fixed Speeds . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .17
Adjustable Speeds in Two or More Non-Overlapping Speed Ranges . . . . . . . . . . . . . .18
Multiple Full Range Adjustable Speeds . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .19
External Signal Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .19
High Speed Range . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .21
Run / Stop Circuits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .22
Run / Stop Using Normally Closed Contacts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .22
Run / Stop Using Normally Open Contacts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .23

iiiTable of Contents
Reversing Circuits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .24
Reversing with a Toggle Switch . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .25
Reversing with Relays . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .26
DC Shunt Wound Motor Dynamic Braking Theory . . . . . . . . . . . . . . . . . . . . . . . . . . . .27
Gearmotor Caution . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .29
Dynamic Braking Circuit Cautions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .29
Run/Stop with Dyanmic Braking using a Toggle Switch . . . . . . . . . . . . . . . . . . . . . . . .30
Run/Stop Dynamic Braking using a Relay . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .31
Reversing with Dynamic Braking Circuits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .33
Reversing with Dynamic Braking using a Rotary Switch . . . . . . . . . . . . . . . . . . . . . . .33
Reversing with Dynamic Braking using Relays . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .35
Limit Switch Circuits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .37
Toggle Switch Reversing with Limit Switches . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .38
Relay Reversing with Dynamic Braking and Limit Switches . . . . . . . . . . . . . . . . . . . . .40
Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .42
Parts List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .46
Unconditional Warranty . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .inside back cover

iv
Illustrations
Figure 1. Maximum Speed & Regulation Trimpot Locations . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4
Figure 2. SL15U Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5
Figure 3. Maximum Speed and Regulation Trimpot Locations . . . . . . . . . . . . . . . . . . . . . . . . . . .13
Figure 4. Adjustable / Fixed Speeds . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .16
Figure 5. Multiple Fixed Speeds . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .17
Figure 6. Two Non-Overlapping Speed Ranges . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .18
Figure 7. Two Full Range Adjustable Speeds . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .20
Figure 8. External Signal Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .20
Figure 9. Field Weakening Resistor for High Speed Range . . . . . . . . . . . . . . . . . . . . . . . . . . . . .21
Figure 10. Run / Stop Using Normally Closed Contacts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .22
Figure 11. Run / Stop Using Normally Open Contacts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .23
Figure 12. Reversing with Toggle Switch . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .25
Figure 13. Reversing with Relays . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .26
Figure 14. Run / Stop Dynamic Braking with Toggle Switch . . . . . . . . . . . . . . . . . . . . . . . . . . . .30
Figure 15. Run / Stop Dynamic Braking using a Relay . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .32
Figure 16. Rotary Switch Reversing with Dynamic Braking . . . . . . . . . . . . . . . . . . . . . . . . . . . . .34
Figure 17. Reversing with Dynamic Braking using Relays . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .36
Figure 18. Toggle Switch Reversing with Limit Switches . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .39
Figure 19. Relay Reversing / Braking with Limit Switches . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .41

The Model SL15U Minarik adjustable speed control is a full wave,
solid state device that is designed to control and vary the speed of
Bodine 1/70th and 1/50th HP, 115 VDC shunt wound motors. The
control has choke/capacitor filtering to assure the controlled motor
will be extra quiet, smooth and cool running. In a typical application
2% base speed regulation is provided with the help of temperature,
line voltage, and IR compensation. The control features a speed
range of 25:1, adjustable IR compensation, and a maximum speed
adjustment to limit high speed operation. The Model SL15U Minarik
adjustable speed control is a U.L. (Underwriters Laboratories)
recognized component, File E35603.
1
General Information

2
Features
• Choke/Capacitor Filtering
• Temperature Compensation
• 2% Base Speed Regulation (Typical Application)
• Maximum Speed Adjustment
• Adjustable IR Compensation
• Line Starting and Stopping
• Line Voltage Compensation
• Full Wave Armature and Field Supply

3
Input Voltage 115 VAC, 50/60 Hz Single Phase
Maximum Input current 0.9 Ampheres
Output Armature Voltage 0 - 115 VDC
Output Armature Current 0.25 Amperes
Output Field Voltage 100 VDC
Output Field Current 0.2 Amperes
Weight 8.0 Ounces
Ambient Temperature Range 10° thru 40° Centigrade
Specifications

4
Dimensional Data
SO1
2.625
[67]
3.000
[76.2]
0.1875 [5]4.125 [105]
4.500 [114]
REG
P3
MAX SPD
P2
Figure 1. Maximum Speed & Regulation Trimpot Locations
ALL DIMENSIONS IN INCHES [MILLIMETERS]

5
P1
6K SPEED ADJUST
POTENTIOMETER
CW
GRAY
BROWN
VIOLET
SO1
PL1
ARMATUREFIELD
115 VAC
50/60 HZ
FUSE WITH
1.5 AMP QUICK
ACTING FUSE BLK/WHT
WHITE
(neutral)
(hot)
++--
BLUE
YELLOW
RED
1/50 HP OR LESS 115 VDC
SHUNT WOUND MOTOR
Figure 2. SL15U Connections

6
The SL15U is an uncased chassis model and is designed to be
installed in original equipment. The speed adjust pot (P1) and its
mounting hardware is supplied with the control. Mount the speed
adjust pot through a 3/8” hole with the insulator disc between the pot
and the inside of the panel. The lock washer is placed between the
outside of the panel and the lock nut. Mount the chassis to
appropriate subplates using the four threaded (6-32) mounting
stand-offs (refer to Figure 1 on page 4 for mounting dimensions).
The chassis has adequate heat sinking to properly dissipate the
load generated heat and can be either vertically or horizontally
mounted.
Installation

7Installation
Leave enough room around the outer dimensions of the chassis to
allow access to the chassis after installation for unmounting,
installing wiring, calibration and other related reasons. Connections
are to be made to the cable wiring shown in Figure 2 on page 5.
WARNING: The SL15U is not isolated from earth ground. Unless
an isolation transformer is used, circuit components are at a
potential of 115 volts above ground. Please refer to Safety
Precautions on page i before installing.
1. Connect the speed adjust pot to its appropriate wires. These 3
wires should NOT be bundled with the motor and power line
leads because induced voltages could cause erratic operation.
If the speed adjust pot requires wiring longer than 18”, a shielded
cable must be used and one end ONLY of the shielding must be
connected to earth ground.

8Installation
2. Connect the motor to its appropriate wires. If the motor rotates
in the wrong direction, reverse the motor armature leads. Do
NOT plug reverse the motor.
3. Connect the power line to the appropriate wires. The hot leg of
the power line should be fused with a fast blow 1.5 amp fuse to
protect the control. The motor may be started and stopped with
the power line at any speed setting on the speed adjust pot. The
motor coasts to a stop when the power line is disconnected. If
dynamic braking is desired see Application Notes section.
Alternative Wiring
By utilizing additional components the SL15U may be operated by
external signal control, have multiple preset speeds, dynamic
braking, limit switch operation, etc. Please refer to Application
Notes section for these and other modes of operation.

9
Maximum Speed and Regulation (IR COMP) Adjustment
IMPORTANT: A non-metallic screwdriver should be used when
adjusting the trim pots to avoid any possibility of the screwdriver’s
blad contacting live circuitry and shorting the circuitry or allowing
contact with any dangerous or fatal voltages.
Dangerous voltages exist on the printed circuit board. Contact with
components and/or printed circuitry could cause serious injury or
fatality. Please refer to the Safety Warnings on page i.

Warning
Two potentiometers, located on the control PC board, are provided
for adjustment of the maximum motor speed and regulation of the
motor’s speed.
Calibration

10 Calibration
MAXIMUM SPEED ADJUSTMENT
This feature is provided to allow the motor speed to be adjusted
between 75 to 120% of motor name plate rated speed when the
speed adjust knob is set at maximum.
REGULATION (IR COMPENSATION)
Regulation is obtained by circuitry which raises the armature
voltage to maintain speed when increased loading tends to slow the
motor down.

11
The control has been factory calibrated and no further adjustments
should be necessary. However, since the control was calibrated
using a speed adjust pot (P1) of 6K ohms and the pot shipped with
the control has a tolerance of ±5%, the maximum speed could be
higher or lower than 2500 RPM. If maximum speed is not
satisfactory, if control has been repaired, or if the user wants to
make any changes, follow the procedure listed below:
1. Disconnect the power line.
2. Set the speed adjust knob to “0” (full CCW).
3. Set the MAXIMUM SPEED trim pot to full CCW (refer to Figure
3 on page 13).
4. Set the REGULATION trim pot to full CCW (refer to Figure 3 on
page 13).
5. Heed and follow the SAFETY WARNING at the beginning of this
section.
Standard Calibration
Calibration

12 Calibration
6. With no load on the motor, apply 115 VAC to the control and
advance the speed adjust knob to “100” (full CW).
7. Adjust the MAXIMUM SPEED trim pot for approximately 2500
RPM motor speed at no load.
8. Set the speed adjust knob for approximately 700 RPM at no
load. Adjust the REGULATION trim pot to obtain 700 RPM at full
load.
9. Set the speed adjust knob to “100” (full CW) and re-adjust the
MAXIMUM SPEED trim pot to approximately 2500 RPM no
load.

13
Figure 3. Maximum Speed and Regulation Trimpot Locations
MAXIMUM SPEED
REGULATION (IR COMP)
Calibration

14
DISCLAIMER - The following circuitry does not purport to cover all
possible details or variations, nor to provide for every possible
contingency to be met with connection, installation, operation, or
maintenance - and no warranty of fitness for purpose is expressed
or implied. And further, Minarik Corporation assumes no
responsibility for the use of any circuitry described and makes no
representation that they are free from patent infringement.
Application Notes
The components shown in the following circuitry should only be
connected by qualified electrical personnel familiar with the
construction, operation, and hazards of all the components used.
Personal injury and/or equipment damage may occur if components
are improperly connected, installed, adjusted, or serviced. Also refer
to the Safety Warnings on page i.
Warning
