Page 1
Tension Brakes/Air Cooled
Mistral Brakes
Wichita Mistral pneumatic tension brake is
attuned to the needs of the corrugating market
for which it was originally de signed. It is also a
versatile product which is finding favor in ad di -
tion al tensioning ap pli ca tions. Wichita de sign ers
and en gi neers consulted
ex ten sive ly with mill roll
stand man u fac tur ers and
users to offer a tension
brake ideally suited to
the needs of this
particular market. The
result is a compact, high per for mance, ver sa tile
brake ca pa ble of han dling the tensioning needs
of the latest ma chine de signs, as well as
existing equip ment. The Mistral paves the way
for in creas ing line speeds by 5.4 ft./sec. from
810 ft./min. (or slower) to 1,140 ft./min.
Mounting Ease
Three bolts mount the brake to the arm of
the mill roll stand or machine frame and an
optional pilot location makes fitting to both
new and existing ma chines a simple
operation.
Wear Indicator
A brake wear
in di ca tor, which
is con ve nient ly
lo cat ed for easy
visual in spec tion, means
no down time to check
re main ing friction
material life.
Easy Connection
Air and electrical connections are easily
accessible for fast, simple installation and
main te nance.
Compact Design, Modern Styling
Mistral brakes are compact at only 11.6" or 16.1"
in diameter. Their size facilitates the pickup of
small, part reels used in short batch runs. For
automatic reel loading machines, Mistral offers
optional infrared and speed sensor installation
within the brake. And their modern, industrial
styling enhances the appearance of any ma chine
on which they are used.
guards. Op er a tor safety is further en hanced by
au to mat ic air and electric disconnects when
the front cover is removed.
102 Wichita Clutch 800-964-3262
Fine Tuning
Each brake may be specified with a varying
number of pneumatic actuators, allowing precise
selection of brake torque capacity for optimum
tension control.
Safety
Mistral’s integral guard ing
elim i nates the cost and
effort of installing external
P-1100-WC 1/12
Page 2
Tension Brakes/Air Cooled
Mistral Brakes
Front Cover Removal
By removing just three cap screws, the
Mistral’s front cover can be detached for
easy and fast access to internal parts. Cover
re mov al au to mat i cal ly dis con nects both air
and electricity.
Fan Data and Connection Data
Model Fan Voltages Fan Power Electric Pneum.
220 VAC or/order M16 1/8 BSP
200 110 VAC or/order 20W PG9 1/8 BSP
24 VDC 3/8 NPT 1/8 NPT
220 VAC or/order M16 1/8 BSP
280 110 VAC or/order 18W PG9 1/8 BSP
24 VDC 3/8 NPT 1/8 NPT
Integral Cooling
A rugged, high
per for mance,
low energy
us age fan is
housed within
the brake for
high heat
dissipation —
a must for
in creased
pro duc tiv i ty through con trolled tension
at many roll speeds.
Performance Curve
C
Dynamic Slipping Heat Transfer Maximum Inertia of Fan Power
Model Torque Capacity Capacity Speed Rotating Parts Weight Rating
Air Pressure Continuous :30 On/:30 Off
lb.in. (Nm) Operation Operation WR
Min.* Max. Min.* Max.
Mistral 3 PSI 80 PSI 0.2 BAR 5.5 BAR HP (kW) HP (kW) Rev./Min. lb.ft.2 (kgm2) lb. (kg.) lb. (kg.) W
200/2/LC 35 1,770 (4) (200) 3.2 (2.4) 3.5 (2.6) 2,860 0.40 (0.017) 77 (35) 9.92 (4.5) 20
200/2 45 2,655 (5) (300) 3.2 (2.4) 3.5 (2.6) 2,860 0.40 (0.017) 77 (35) 9.92 (4.5) 20
200/4/LC 35* 3,540 (4*) (400) 3.2 (2.4) 3.5 (2.6) 2,860 0.40 (0.017) 77 (35) 9.92 (4.5) 20
200/4 45* 5,310 (5*) (600) 3.2 (2.4) 3.5 (2.6) 2,860 0.40 (0.017) 77 (35) 9.92 (4.5) 20
200/6/LC 35* 5,310 (4*) (600) 3.2 (2.4) 3.5 (2.6) 2,860 0.40 (0.017) 77 (35) 9.92 (4.5) 20
200/6 45* 7,965 (5*) (900) 3.2 (2.4) 3.5 (2.6) 2,860 0.40 (0.017) 77 (35) 9.92 (4.5) 20
280/3/LC 45 3,540 (5) (400) 6.4 (4.8) 7 (5.2) 2,090 1.80 (0.076) 110 (50) 20.72 (9.4) 25
280/3 55 5,310 (6) (600) 6.4 (4.8) 7 (5.2) 2,090 1.80 (0.076) 110 (50) 20.72 (9.4) 25
280/6/LC 45* 7,080 (5*) (800) 6.4 (4.8) 7 (5.2) 2,090 1.80 (0.076) 110 (50) 20.72 (9.4) 25
280/6 55* 10,620 (6*) (1,200) 6.4 (4.8) 7 (5.2) 2,090 1.80 (0.076) 110 (50) 20.72 (9.4) 25
280/9/LC 45* 10,620 (5*) (1,200) 6.4 (4.8) 7 (5.2) 2,090 1.80 (0.076) 110 (50) 20.72 (9.4) 25
280/9 55* 15,930 (6*) (1,800) 6.4 (4.8) 7 (5.2) 2,090 1.80 (0.076) 110 (50) 20.72 (9.4) 25
* With only one set of actuators engaged
P-1100-WC 1/12
2
J=mr
2
Total Brake Rotating Parts
Wichita Clutch 800-964-3262 103
Page 3
Tension Brakes/Air Cooled
Mistral Brakes
Selecting a Mistral Brake for a
Corrugator Tension – unwind
application
To properly select a tension brake for an
unwind application the following in for ma tion is
needed.
Application Data
Max. Roll Dia. . . . . . . . . . . . . . . . . . . . . . . 48 in.
Max. Web Width. . . . . . . . . . . . . . . . . . . . 36 in.
Max. Web Speed . . . . . . . . . . . . . . . 1200 FPM
Max. Tension . . . . . . . . . . . . . . . . . . . . . . . 2 PLI
Shaft Size . . . . . . . . . . . . . . . . . . . . . . . . . . 2 in.
Min. Roll Dia. . . . . . . . . . . . . . . . . . . . . . . . 6 in.
Min. Web Width . . . . . . . . . . . . . . . . . . . . 36 in.
Min. Web Speed . . . . . . . . . . . . . . . . 1000 FPM
Min. Tension . . . . . . . . . . . . . . . . . . . . . . . 1 PLI
Air Pressure Available. . . . . . . . . . . . . . . 80 PSI
Calculations
Using the calculations below, consult
Specifications Chart, page 103.
The brake selected for this application is a
Mistral 200/2 with 2-1/4 inch bore.
How to Select
1. Check the required torque versus the
available actuators’ torque capacities. The
Mistral 200/2/LC has a torque capacity of
1,180 lb.in. at 80 PSI. The torque
requirement is 1,728 lb.in. and therefore the
Mistral 200/2/LC has insufficient torque
capacity. However, the 200/2 has sufficient
torque capacity.
2. Check thermal requirement. The
re quire ment is 2.6 heat HP. All the Mistral
200’s are capable of 3.2 heat HP.
3. Check Maximum Bore. The re quire ment is
2.00 inches. The Mistral 200’s maximum
bore is 2.25 inches.
4. Check Maximum RPM. The re quire ment is
764 RPM. The maximum RPM for the Mistral
200’s is 2,860 RPM.
Max. Air Pressure
Required =
Catalog Torque Rating
= 1,728 x 80/1,770 = 78 PSI
Max. Torque x 80 PSI
Max. Tension = Max. PLI x Max. Web Width
= 2 x 36 = 72 lbs.
Max. Tension x Max. Roll Dia.
Max. Torque =
= 72 x 48/2 = 1,728 lb.in.
Max. RPM =
= 1,200 x 3.82/6 = 764 RPM
Heat HP =
Speed/33,000
=
33,000
Min. Tension = Min. PLI x Min. Web Width
= 1 x 36 = 36 lbs.
Min. Torque =
= 36 x 6/2 = 108 lb.in.
Min. RPM =
= 1,000 x 3.82/48 - 80 RPM
2
Max. Web Speed x 3.82
Min. Roll Dia.
Max. Tension x Max. Web
72 x 1,200
Min. Tension x Min. Roll Dia.
Min. Web Speed x 3.82
= 2.6 Heat HP
2
Max. Roll Dia.
Min. Air Pressure
Required
Catalog Torque Rating
=
1770
= 5 PSI
Min. Torque x 80 PSI
=
108 x 80
104 Wichita Clutch 800-964-3262
P-1100-WC 1/12
Page 4
Optional
Set Screw
Tension Brakes/Air Cooled
Mistral Brakes
C
Dimensions: inches (mm)
B K
Model A H.C. F G H J DEG L M N P
11.61 10.236 .24 1/2 .98 1.97 40° 7.01 N/A 2.76 7.19
200
(295) (260) (6) (M12) (25) (50) (40°) (178) (N/A) (70) (182.5)
16.14 13.976 0 5/8 1.18 2.36 20° 7.56 0.37 3.15 9.47
280
(410) (355) 0 (M16) (30) (60) (20°) (192) (9.5) (80) (240.5)
Pilot Mounting Dimensions “C” and
“D” (mm)
Mounting Bolts
Model Mounting Pilot Qty. and Size
Dim. “C”
200 8.661 +.003/-.000 3 @ 1/2 - 13 UNC
(220 +.08/-.00) (3 @ M12 x 1-3/4)
Dim. “D”
280 6.890 +.003/-.000 3 @ 5/8 - 11 UNC
(175 +.08/-.00) (3 @ M16 x 2)
Actuator/Inlet
No. of
Actuators
No. of No. of Per Air Inlets
Model Actuators Air Inlets AA BB
200/2 2 2 2 0
200/4 4 2 2 2
200/6 6 2 2 4
280/3 3 2 3 0
280/6 6 2 3 3
280/9 9 2 3 6
Bore and Keyway Dimension “E” (mm)
Minimum Bore Maximum Bore
Model (No Keyway) with Keyway
1.00 2-3/8 5/8 x 7/32
200
(25) (60) (18 x 4.4)
1.00 2-5/8 3/4 x 1/4
280
(25) (65) (18 x 4.4)
Note: For mounting, use socket head capscrews conforming to the ASTM-574-97a or ASTM-574M-97a (Metric Version).
P-1100-WC 1/12
Wichita Clutch 800-964-3262 105
Loading...