SFP-250 and SFP-400
P-231
819-0382
Installation Instructions
Contents
Introduction
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . 4
Specifications . . . . . . . . . . . . . . . . . . . . . . . . . 4
Coil Ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Warranty . . . . . . . . . . . . . . . . . . . . . . Back Page
The Warner Electric SFP-250 and SFP-400 are
shaft mounted stationary field electromagnetic
clutches. Designed for simplicity, the units are
preburnished at the factory and are ready to
install onto the shaft. Once installed, there is no
need to make any adjustments for wear, and
there are no parts that should need replacing
over the natural life of the clutch. With the
proper alignment already set by the factory and
with no brushes to wear out, the SFP-250 and
SFP-400 are assured for dependable, trouble
free life.
Follow the instructions in this
manual carefully to assure proper installation
and operation. Failure to do so may result in
damage to property and/or injury or even
death to personnel.
Warner Electric • 800-825-9050 P-231 • 819-0382
2
Installation
Maintenance
1. Check that the unit has arrived in good
condition. Each clutch comes with a terminal
accessory kit, part number 5103-101-002,
containing two screws, two terminal rings,
and two rubber terminal caps.
2. Fasten the user supplied pulley or sheave to
the clutch armature using the three threaded
mounting holes provided. Make sure that the
fasteners are short enough so they do not
bottom out on the armature. Refer to the
Dimensions section for bolt circle and thread
®
information. Use Loctite
242 or equivalent to
help assure thread retention.
3. For the SFP-400 only: To install the optional
conduit box, Warner Electric part number
5200-101-010, follow the separate installation
instructions provided with the conduit box to
assemble it to the clutch.
4. Slide the clutch onto the shaft.
Be sure the keyway is
positioned over the user supplied shaft key.
Alternately tighten the two setscrews to
secure the clutch to the shaft. (Depending on
the width of the pulley, it may have been
necessary to tighten the setscrews before
fastening the pulley.)
SFP-250 and SFP-400 are dry
friction devices. DO NOT apply oil or
lubrication.
If correctly sized and installed, the SFP-250 or
SFP-400 should run virtually maintenance free.
As with all shaft mounted clutches, the ability to
dissipate heat will improve life. Care should be
taken to ensure adequate ventilation. For
demanding applications where the clutch is
being cycled on and off rapidly, high
temperatures can lead to accelerated wear.
After the friction surfaces undergo a significant
amount of wear, the armature may not pull in or
the unit will show a reduction in torque carrying
capability. Then the clutch will need to be
replaced.
The clutch’s operating environment can also
affect its life. If units are used on machinery
where fine, abrasive dust, chips, or grit are
dispelled into the atmosphere, shielding the
clutch may be necessary for maximum life.
Where the clutch is used near gear boxes or
transmissions requiring frequent lubrication,
means should be provided to protect the friction
surfaces from oil and grease to prevent torque
loss.
5. Attach a user supplied flexible strap or band
to the tab on the back of the field to secure it
to a stationary surface to prevent field
rotation.
The anti-rotation tab on the field
should not be rigidly fixed as this could
preload the bearing and reduce its life.
6. Make electrical connections from the DC
power source to the clutch. Either wire can
be attached to the + or - terminal. If a Warner
Electric control is used as the power source,
follow the connection diagram supplied with
the control.
Warner Electric • 800-825-9050 P-231 • 819-0382
3
Troubleshooting
Specifications
If the clutch does not engage, slips, or loses
torque, the most likely cause is worn out friction
surfaces and the clutch should be replaced. If
excessive wear is not the cause, first check the
input voltage to the coil. Use a DC voltmeter to
check the voltage across the terminals with the
power on and the control turned all the way up.
For 90 volt units, the reading should fall within
the 85-95 volt range. For 24 volt units, 22-26
volts is normal.
Current and resistance checks can be made if
necessary. Connect a low range ammeter in
series with one coil lead. With maximum power
supplied, the current reading should
approximate the data in the coil ratings table. To
check the resistance, use an ohmmeter with the
power off and the circuit open. If a very high or
infinite resistance is indicated, the coil is open
and the clutch should be replaced.
Model Static Torque Max. RPM
SFP-250 70 lb.in. 7500
SFP-400 270 lb.in. 5000
If the above checks indicate that the proper
voltage and current are being supplied to the
magnet, mechanical parts should be checked to
assure that they are in good operating
condition, free of contamination and properly
installed.
Coil Ratings
SFP-250 SFP-400
Voltage–DC 6 24 90 6 12 24 90
Resistance 20˚ C–OHMS 5.0 6.4 1079 2.08 8.41 33.73 474.2
Current–Amperes 1.2 0.314 0.08 2.888 1.426 0.711 0.190
Watts 7.2 7.5 7.51 17.3 17.1 17.0 17.1
Warner Electric • 800-825-9050 P-231 • 819-0382
4
Dimensions
2.79
(70.81)
OPTIONAL CONDUIT BOX
5200-101-010
3.75 (95.25) NOM
ø.192
(4.88)
MIN.
4.69
(119.13)
MAX.
R2.312
(58.72)
NOM.
45°
ø.4.290 (108.97) MAX.
+.010
-.000
C
+.002
-.000
A
+.002
-.000
B
3X 1/4-20 UNC-2B
.270 (6.86) MAX FULL THD
EQUALLY SPACED
ON ø3.500(88.9)
.25
(6.35)
R1.563
(39.67)
.50
(12.69)
33°
ø.200 MAX. (5.08)
24°
ø.635 (16.12)
ø2.645 MAX.
(67.
13)
1.75
(44.42)
1.64
(41.62)
.17
(4.31)
ø1.498 ± .001
(38.02 ± .025)
.80
(20.30)
COLLAR REQUIRED
ON .500 AND .625
BORES ONL
Y
.47
(11.93)
.06
(1.52)
+.010
-.000
C
+.002
-.000
A
+.002
-.000
B
2x #10-32UNF-2B
SET SCREWS
3x #10-32UNF-2B
ø
ø2.000
(50.76)
ø1.20
(30.48)
MIN.
.955
(25.26)
NOM.
.060
(1.52)
NOM.
.014
(.35)
MIN.
1.55
(39.37)
NOM.
1.00
(25.4)
NOM.
.525
(13.3)
MAX.
2X. 1/4-20
SET SCREW
2.998 ± .001
(76.15 ± .025)
.180
(45.72)
NOM.
3.070 (77.98) MAX.
SFP-250
SFP-400
Dimensions
Model A Keyway Part Number
No. Bore BC 6V 24V 90V
.375" .094 .421 5103-271-002 5103-271-006 5103-271-010
SFP-250 .438" .126 .479 5103-271-003 5103-271-007 5103-271-011
.500" .126 .560 5103-271-004 5103-271-008 5103-271-012
.6255" .1885 .678 5103-271-005 5103-271-009 5103-271-013
.5005" .125 .560 5104-271-006 5104-271 -016 5104-271-021
.6255" .187 .709 5104-271-007 5104-271 -017 5104-271-022
SFP-400 .7505" .187 .837 5104-271-008 5104-271-018 5104-271-023
.8755" .187 .964 5104-271-009 5104-271-019 5104-271-024
1.0005" .187 1.090 5104-271-010 5104-271-020 5104-271-025
Warner Electric • 800-825-9050 P-231 • 819-0382
5
Warranty
Warner Electric LLC warrants that it will repair or replace (whichever it deems advisable) any
product manufactured and sold by it which proves to be defective in material or workmanship
within a period of one (1) year from the date of original purchase for consumer, commercial or
industrial use.
This warranty extends only to the original purchaser and is not transferable or assignable without
Warner Electric LLC’s prior consent.
Warranty service can be obtained in the U.S.A. by returning any defective product, transportation
charges prepaid, to the appropriate Warner Electric LLC factory. Additional warranty information
may be obtained by writing the Customer Satisfaction Department, Warner Electric LLC, 449
Gardner Street, South Beloit, Illinois 61080, or by calling 815-389-3771.
A purchase receipt or other proof of original purchase will be required before warranty service is
rendered. If found defective under the terms of this warranty, repair or replacement will be made,
without charge, together with a refund for transportation costs. If found not to be defective, you
will be notified and, with your consent, the item will be repaired or replaced and returned to you
at your expense.
This warranty covers normal use and does not cover damage or defect which results from
alteration, accident, neglect, or improper installation, operation, or maintenance.
Some states do not allow limitation on how long an implied warranty lasts, so the above limitation
may not apply to you.
Warner Electric LLC’s obligation under this warranty is limited to the repair or replacement of the
defective product and in no event shall Warner Electric LLC be liable for consequential, indirect, or
incidental damages of any kind incurred by reason of the manufacture, sale or use of any
defective product. Warner Electric LLC neither assumes nor authorizes any other person to give
any other warranty or to assume any other obligation or liability on its behalf.
WITH RESPECT TO CONSUMER USE OF THE PRODUCT, ANY IMPLIED WARRANTIES WHICH
THE CONSUMER MAY HAVE ARE LIMITED IN DURATION TO ONE YEAR FROM THE DATE OF
ORIGINAL CONSUMER PURCHASE. WITH RESPECT TO COMMERCIAL AND INDUSTRIAL USES
OF THE PRODUCT, THE FOREGOING WARRANTY IS IN LIEU OF AND EXCLUDES ALL OTHER
WARRANTIES, WHETHER EXPRESSED OR IMPLIED BY OPERATION OF LAW OR OTHERWISE,
INCLUDING, BUT NOT LIMITED TO, ANY IMPLIED WARRANTIES OF MERCHANTABILITY OR
FITNESS.
Some states do not allow the exclusion or limitation of incidental or consequential damages, so
the above limitation or exclusion may not apply to you. This warranty gives you specific legal
rights and you may also have other rights which vary from state to state.
Changes in Dimensions and Specifications
All dimensions and specifications shown in Warner Electric catalogs are subject to change without
notice. Weights do not include weight of boxing for shipment. Certified prints will be furnished
without charge on request to Warner Electric.
Warner Electric
31 Industrial Park Road
815-389-3771
www.warnerelectric.com
P-231 819-0382 10/11 Printed in USA
• Fax: 815-389-2582
• New Hartford, CT 06057
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