Warner Electric SFC-120, SFC-170, SFC-250, SFC-400 User Manual
SF-120, SF-170, SF-250, SF-400 Bearing Mounted,
Flange Mounted, SFC-120, SFC-170, SFC-250,
SFC-400 Bearing Mounted, Flange Mounted
P-200
819-0481
Installation Instructions
Contents
Mounting Examples and Options . . . . . . . . . . . . . . . . .3
Installation Instructions
SF-120, SF-170, SF-250, SF-400 . . . . . . . . . . . . .4
SFC-120, SFC-170, SFC-250, SFC-400 . . . . . . . .7
Electrical Coil Data . . . . . . . . . . . . . . . . . . . . . . . . . .11
Burnishing and Maintenance . . . . . . . . . . . . . . . . . . .12
Illustration Drawings
SF-120, SF-170 Flange Mounted . . . . . . . . .14-19
SF-120, SF-170 Bearing Mounted . . . . . . . . .18-21
SF-250, SF-400 Flange Mounted . . . . . . . . .22-25
SF-250, SF-400 Bearing Mounted . . . . . . . . .26-29
SFC-120, SFC-170 Flange Mounted . . . . . . .30-33
SFC-120, SFC-170 Bearing Mounted . . . . . .34-37
SFC-250, SFC-400 Flange Mounted . . . . . . .38-41
SFC-250, SFC-400 Bearing Mounted . . . . . .42-45
Warranty . . . . . . . . . . . . . . . . . . . . . . . . . . .Back Cover
Follow the installation instructions in this manual
carefully to ensure safe, reliable operation. All
stated or implied manufacturer warranties are
voided if this product is not installed in
accordance with these instructions.
Failure to follow these instructions
may result in product damage, equipment damage,
and serious or fatal injury to personnel.
SF-120
SF-250
Warner Electric • 800-825-9050 P-200 • 819-0481
2
SF-170
SF-400
Mounting Examples and Options
Warner Electric clutches are simple to
install. They consist of components
which must be assembled on the
shaft and properly attached to the
machine frame.
Various customer furnished drive
components must be assembled with
the clutch. Pulleys, sprockets and
bearings/pillow blocks for shafting
may be essential elements of a
complete drive system. Squareness
and concentricity tolerances are
specified where critical to proper
clutch/brake functioning.
The illustrations show SF, and SFC
Flange Mounted and Bearing
Mounted units mounted with
customer supplied bearing mounted
pulley. In each illustration the drive pin
for a normal duty clutch is shown. In
this manner the pulley will support
the armature.
SF Clutches and SFC Clutch Couplings
Flange Mounting
Concentricity tolerances, held by customer,
are critical. Pilot surface required on
machine member. Eliminates bearings.
Good design for high speed applications.
SF Clutch
Typical Installation
SFC Clutch Coupling
Typical Installation
Bearing Mounting
Bearing supports field and holds close tolerances
required between rotor and field. Easy to install
and priced about the same as the flange
mounted design.
SF Clutch
Typical Installation
SFC Clutch Coupling
Typical Installation
Warner Electric • 800-825-9050 P-200 • 819-0481
3
Clutch SF-120, SF-170, SF-250, SF-400
Field
Mounting
Surface
Pilot
Diameters
Installation Instructions
A. Installing the Conduit Box
To install the conduit box on the size 400 units, refer
to the instructions supplied with conduit box.
B. Mounting the Field-and-Rotor Assembly
Flange-Mounted Units
The fields and rotors are shipped separately for
flange-mounted units. On some applications it may
be necessary to mount the rotor first, and then bring
the field into position. In other instances the field
may be mounted first, and then the rotor (mounted
on a shaft) will be inserted into place.
Figure 2
7. Secure the assembly in this position by
alternately tightening the two setscrews.
1. Care must be taken in selecting the location for
mounting the field assembly. Pilot diameters are
machined on the field mounting flange to aid in
holding the field in the proper position.
2. An appropriate pilot diameter must be provided
on the mounting surface as well. (Figure 1)
Figure 1
3. The field assembly is then fastened in place with
capscrews and lockwashers. (Figure 2)
4. After the unit is in place, the mounting face and
pilot must be square and concentric with the
shaft in accordance with the tolerances listed on
the drawings.
5. Insert a key into the shaft keyway.
6. Slide the rotor assembly onto the shaft over
the key.
8. Position the field and rotor in accordance with
the overall axial dimension shown on the
illustration drawings for correct size unit. Holding
this dimension will assure the proper clearance
between the field and rotor.
Bearing-Mounted Units
In bearing-mounted units, the field and rotor are
shipped as an assembly. Either this assembly or the
armature and hub assembly can be mounted on the
shaft first, depending on the characteristics on each
application.
1. Insert the key into the shaft keyway.
2. Slide the rotor assembly over the key and on to
the shaft.
3. Secure the field-and-rotor assembly in place by
alternately tightening the two set screws.
Note: The field-and-rotor assemblies for 120
units and 250 units, 1/2 inch bore,
are held in place by set screws
inserted into a set collar on the end of
the rotor hub extension. Secure these
assemblies in place by alternately
tightening the screws.
4. A tab or torque arm on the field is used to
prevent rotation of the field caused by normal
bearing drag. Insert either a pin in the U-slot or
a fork around the torque arm to prevent this
rotation. Under no circumstances, however,
should the field be so tightly restrained as to
preload the bearing.
Warner Electric • 800-825-9050 P-200 • 819-0481
4
C. Assembling the Armature and Hub
The clutch units contain an extended armature hub
mounted on sleeve bearings. These hubs may be
adapted to a customer-supplied sheave, sprocket,
or gear for transmitting power to a parallel shaft.
1. The antibacklash armatures are shipped
assembled and ready to be installed. See
Section D.
2. The standard armature and hub must be
assembled before it can be installed. Assemble
the armatures so that the shiny surfaces size
(120 and 170) or backing plate sides size (250
and 400) are against the hub retainer ring
(Figure 3).
Figure 4
Insert both release springs into the holes of the
backing plate. Bow the springs as necessary to
insert them into the armature. (See Figure 6)
Figure 3
3. An optional release spring may be used with the
standard armatures and hubs. The release
spring forces the armature back against the hub
retainer ring when the magnet coil is
de-energized.
Follow these instructions to assemble the
armature and hub when the optional release
springs are being used.
SF-170
Assemble the splined armature to the hub. The
shiny side of the armature should be against the
hub retainer ring.
Assemble the release spring into the groove in
the hub spline. The curved portion of the spring
should be against the armature (Figure 4).
SF-250
Insert the hub, with snap ring intact, into the
armature from the backing plate side. (See
Figure 5)
Figure 5
Figure 6
Warner Electric • 800-825-9050 P-200 • 819-0481
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SF-400
Insert the release springs into the backing plate
holes of the armature. Bow the springs as necessary to insert them into the armature. (See
Figure 7)
Assemble the snap ring into the groove in the
hub, clamping the release spring against the
end of the spline. (See Figure 9)
Figure 9
Figure 7
Remove the snap ring from the hub.
Insert the hub, with the setscrew end first, into
the armature from the segmented side. Slide
the hub into the armature until the release
springs engage the snap ring groove. (See
Figure 8)
Figure 8
D. Mounting the Armature Assembly
1. Slide the armature assembly onto the shaft.
Position the assembly in accordance with the
overall axial dimensions given on the illustration
drawings.
2. The armature-hub assembly can be held in this
position with retainer rings, a set collar, a
shoulder on the shaft, or any combination of
these. The hub may need to be repositioned as
wear occurs with time.
Warner Electric • 800-825-9050 P-200 • 819-0481
6
Clutch-Coupling SFC-120, SFC-170,
Field
Mounting
Surface
Pilot
Diameters
SFC-250, SFC-400
Installation Instructions
A. Aligning the Shafts
In order for the clutch-coupling unit to operate
properly, the mounting shafts of the motor and
reducer or other hardware must be aligned with
respect to each other before the unit is installed.
The two shafts should be concentric with each
other within .004 T.I.R., and angular alignment
should be within 1/2 degree.
B. Installing the Conduit Box
To install the conduit box on the size 400 units, refer
to the instructions supplied with conduit box.
C. Mounting the Field-and-Rotor Assembly
Flange-Mounted Units
The fields and rotors are shipped separately for
flange-mounted units. On some applications it will
be necessary to mount the rotor first, and then
bring the field into position. In other instances the
field will be mounted first, and then the rotor
(mounted on a shaft) will be inserted into place.
1. Care must be taken in selecting the location for
mounting the field assembly. Pilot diameters are
machined on the field mounting flange to aid in
holding the field in the proper position. (Figure
1)
1. Use a straight-edge to check if the shafts are
aligned with each other. For a more precise
indication of alignment, use a dial indicator.
(Figure 10)
2. Adjust the position of the motor, reducer, or
other hardware as required to achieve the
2. An appropriate pilot diameter must be provided
on the mounting surface as well.
3. The field assembly is then fastened in place
with capscrews and lockwashers. (Figure 2)
Figure 1
correct alignment.
3. To be sure the shafts stay in alignment, drill
holes for tapered dowel pins through the
mounting bases of the motor, reducer, or other
hardware and into the mounting surfaces. This
procedure will ensure that, after the clutchcoupling has been installed, the shafts can
easily be placed in proper alignment again by
lining up the holes and secured by inserting the
dowel pins.
Warner Electric • 800-825-9050 P-200 • 819-0481
Figure 2
7
4. After the unit is in place, the mounting face and
pilot diameter must be square and concentric
with the shaft in accordance with the tolerances
listed on the drawings.
5. Insert a key into the shaft keyway.
6. Slide the rotor assembly onto the shaft over the
key.
7. Secure the assembly in this position by
alternately tightening the two setscrews.
8. Position the field and rotor in accordance with
the overall axial dimension shown on the
illustration drawings. Holding this dimension will
assure the proper clearance between the field
and rotor.
Bearing-Mounted Units
In bearing-mounted units, the field and rotor are
shipped as an assembly. Either this assembly or the
armature and hub assembly can be mounted on the
shaft first, depending on the characteristics of each
application.
1. Insert the key into the shaft keyway.
2. Slide the rotor assembly over the key and on to
the shaft.
C. Assembling the Armature and Hub
1. The antibacklash armatures are shipped
assembled and ready to be installed. See
Section D.
2. The standard armature and hub must be
assembled before it can be installed. Assemble
the armatures so that the shiny surfaces size
(120 and 170) or backing plate sides size (250
and 400) are against the hub retainer ring
(Figure 3).
Figure 3
3. An optional release spring may be used with the
standard armatures and hubs. The release
spring forces the armature back against the hub
retainer ring when the magnet coil is
de-energized.
3. Secure the field-and-rotor assembly in place by
alternately tightening the two set screws.
Note: The field-and-rotor assemblies for 120
units and 250 units, 1/2 inch bore,
are held in place by set screws
inserted into a set collar on the end of
the rotor hub extension. Secure the
assembly in place by alternately
tightening the screws.
4. A tab or torque arm on the field is used to
prevent rotation of the field caused by normal
bearing drag. Insert either a pin in the U-slot or
a fork around the torque arm to prevent this
rotation. Under no circumstances, however,
should the field be so tightly restrained as to
preload the bearing.
Follow these instructions to assemble the
armature and hub when the optional release
springs are being used.
Warner Electric • 800-825-9050 P-200 • 819-0481
8
SFC-170
Assemble the splined armature to the hub. The
shiny side of the armature should be against the
hub retainer ring.
SFC-400
Insert the release springs into the backing plate
holes of the armature. Bow the springs as
necessary to insert them into the armature. (See
Figure 7)
Assemble the release spring into the groove in the
hub spline. The curved portion of the spring should
be against the armature (Figure 4).
Figure 4
SFC-250
Insert the hub, with snap ring intact, into the
armature from the backing plate side. (See Figure 5)
Remove the snap ring from the hub.
Figure 7
Insert the hub, with the setscrew end first, into the
armature from the segmented side. Slide the hub
into the armature until the release springs engage
the snap ring groove. (See Figure 8.)
Figure 5
Insert both release springs into the holes of the
backing plate. Bow the springs as necessary to
insert them into the armature. (See Figure 6)
Figure 6
Warner Electric • 800-825-9050 P-200 • 819-0481
Assemble the snap ring into the groove in the hub,
clamping the release spring against the end of the
spline. (See Figure 9.)
Figure 8
Figure 9
9
D. Mounting the Armature Assembly
1. SFC 250 and 400 size units.
Insert a key in the keyslot of the shaft and slide the
armature assembly onto the shaft.
2. (SFC120 do not use keyway)
Position the assembly to allow a gap of about 1/64
inch between the faces of the armature and magnet.
The overall axial dimension should be in accordance
with the dimensions specified on the illustration
drawings.
3. Secure the assembly in this position by alternately
tightening the two setscrews in the hub.
4. The hub may need to be repositioned as wear
occurs with time.
Electrical Coil Data
Unit Size SF/SFC 120 SF/SFC 170
Voltage – DC 6 24 90 6 24 90
Resistance @ 20°C — Ohms 6.32 104 1386 6.96 111.2 1506
Current — Amperes .949 .230 .065 .861 .215 .060
Watts 5.69 5.52 5.85 5.85 5.16 5.37
Coil Build-up — Milliseconds 12 12 11 17 17 16
Coil Decay — Milliseconds 8 878 76
Unit Size SF/SFC 250 SF/SFC 400
Voltage – DC 6 24 90 6 24 90
Resistance @ 20°C — Ohms 5 76.4 1079 4.88 73 1087
Current — Amperes 1.2 .314 .084 1.23 .322 .083
Watts 7.2 7.5 7.51 7.39 7.96 7.45
Coil Build-up — Milliseconds 48 48 44 154 154 154
Coil Decay — Milliseconds 15 15 13 62 60 55
Notes: Build-up time equals current to approximately 90% of steady state value and flux to 90%.
Decay time equals current to approximately 10% of steady state value and flux to 10%.
Approximately because current leads or lags flux by a small amount.
Warner Electric • 800-825-9050 P-200 • 819-0481
10
Burnishing and Maintenance
Burnishing
Intimate metal to metal contact is essential between the
armature and the metal rings (poles) of the magnet or
rotor. Warner Electric clutches and brakes leave the
factory with the friction material slightly undercut to assure
good initial contact.
Normally, the desired wearing-in process occurs naturally
as the surfaces slip upon engagement. The time for
wear-in, which is necessary to obtain the ultimate torque
of the unit, will vary depending on speed, load, or cycle
duty.
If maximum torque is required immediately after
installation, the unit should be burnished by slipping the
friction surfaces together at reduced voltage. It is
recommended that the burnishings be done right on the
application, if at all possible.
Burnishing at high speed will result in a smoother wear-in
pattern and reduce the time for burnishing. The voltage
should be set at approximately 30% or 40% of the rated
value.
The unit should be cycled on and off to allow sufficient
time between slip cycles to prevent overheating.
When a Warner Electric brake or clutch is properly
assembled and installed, no further servicing, lubrication,
or maintenance should be required throughout the life of
the unit.
Maintenance
Wear Pattern: Wear grooves appear on the armature and
magnet surfaces. This is a normal wear condition, and
does not impair functioning of the unit. Normally, the
magnet and armature, as a mating pair, will wear at the
same rate. It is the usual recommendation that both components be replaced at the same time.
Heat: Excessive heat and high operating temperatures
are causes of rapid wear. Units, therefore, should be
ventilated as efficiently as possible, especially if the
application requires fast, repetitive cycle operation.
Foreign Materials: If units are used on machinery
where fine, abrasive dust, chips or grit are dispelled into
the atmosphere, shielding of the brake may be
necessary if maximum life is to be obtained.
Where units are used near gear boxes or transmissions
requiring frequent lubrication, means should be provided
to protect the friction surfaces from oil and grease to
prevent serious loss of torque.
Oil and grease accidentally reaching the friction surfaces
may be removed by wiping with a rag dampened with a
suitable cleaner, which leaves no residue. In performing
this operation, do not drench the friction material.
If the friction materials have been saturated with oil or
grease, no amount of cleaning will be completely
effective. Once such a unit has been placed back in
service, heat will cause the oil to boil to the surface,
resulting in further torque loss.
Torque Loss: If a brake or clutch slips or loses torque
completely, the initial check should be the input voltage
to the magnet as follows:
90-Volt Series: Connect a DC voltmeter with a range of
0-100 or more directly across the magnet terminals.
With the power on and the potentiometer turned up, a
normal reading is 90 volts, although 85 to 95 is
satisfactory. The reading should drop as the
potentiometer control is adjusted counterclockwise.
24-Volt Series: Use a DC voltmeter with a range of 030 volts or more. A normal reading is approximately 2226 volts.
Remachining the face of a worn armature is not
recommended. If a replacement armature is to be used
with a used magnet, it is necessary to remachine the worn
magnet face. In refacing a magnet: (1) machine only
enough material to clean up the complete face of the
magnet; (2) hold the face within .005" of parallel with the
mounting plate; and (3) undercut the molded facing
material .001" - .003" below the metal poles.
Warner Electric • 800-825-9050 P-200 • 819-0481
6-Volt Series: Use a DC voltmeter of approximately 015 volt range. A normal reading is from 5.5 to 6.5 volts.
The above checks normally are sufficient. Further
checks may be made as follows: a low range ammeter,
when connected in series with one magnet lead, will
normally indicate approximately .40 amperes for the 90
volt units, 1.0 ampere for the 24 volt, and 3.5 amperes
for the 6 volt series. These readings are with the power
on and the potentiometer control in the maximum
position.
11
Ohmmeter checks should be made with the power off
and the circuit open (to be certain, disconnect one lead
to the magnet). Average resistance for the 90 volt series
is 220 ohms; for the 24 volt, 20 ohms; and for the 6 volt
series, 1.5 ohms. A very high or infinite resistance
reading would indicate an open coil.
If the above checks indicate that the proper voltage and
current is being supplied to the magnet, mechanical
parts should be checked to assure that they are in good
operating condition and properly installed.
Warner Electric • 800-825-9050 P-200 • 819-0481
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Warner Electric • 800-825-9050 P-200 • 819-0481
13
SF-120 Clutch Flange Mounted
For Bore sizes see
chart below.
Std. Arm.
Antibacklash Arm.
Armature View
For Bore sizes see
chart below.
1.499/1.497
Pilot Dia.
45°
.130/.123 dia.
4 holes equally
spaced on 1.312
dia. B.C.*
1.234
Max. Dia.
.035/.004 (Std.)
.020/.008 (Anti.)
When New
.072 (Std.)
.072 (Anti.)
.020
.000
.375
(Std.)
.502
.031
.500
.515
.511
* Mounting holes are within .006 of true position relative to pilot diameter.
.375
(Anti.)
Std. Arm
Antibacklash Arm
.375
(Std.)
.375
(Anti.)
.528
1.171 Max.
12
*
.072 (Std.)
.072 (Anti.)
.625
.062
.065/.062 dia.
2 holes equally
spaced
.546
Bore Dimensions
.156
.109
.019
.000
#4-40
UNC-3A
.187
Max.
Rotor Armature
Field View
Bore Dia. Bore Dia.
.188/.187 .195/.190
.251/.250 .257/.252
.313/.312 —
Customer Shall Maintain:
1. Squareness of field mounting face with shaft with
.003 T.I.R. measured at pilot diameter.
2. Concentricity of field mounting pilot diameter with
rotor mounting shaft within .003 T.I.R.
Armature Shaft .187 – .250
Rotor Shaft .187 – .312
Static Torque 5 lb. in.
Maximum Speed 3,600 rpm
Standard Voltage D.C. 6, 24, 90
All dimensions are nominal unless otherwise noted.
Warner Electric • 800-825-9050 P-200 • 819-0481
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