Kobelt 5020-M Series, Owner'S Operation, Installation & Maintenance Manual

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5020-M Owner's Manual Kobelt Manufacturing Co. Ltd.
rev B mnl5020-M.docx 15 of 27
5 O
PERATION
5.1 S
ERVICE
L
IMITS
5.1.1 Disc Temperature
The Kobelt brake lining achieves maximum friction at 300°F. Over 300°F the brake begins to
fade or experience diminishing friction. The maximum operating temperature of the brake
linings is 700°F [371°C]. Temperatures in excess of this limit will permanently damage the
linings and require replacement.
5.1.2 Ambient Temperature
In sub-zero temperatures ventilated discs must be warmed up gently to avoid causing
excessive thermal stresses in the disc. Failure to do so could cause the disc to crack. Once the
temperature of the disc is out of freezing condition it can be used as normally intended.
Operating temperature of standard brake actuators is -40°C [-40°F] to 120°C [248°F]
5.1.3 Disc speed
The potential imbalance in the ventilated disc could be detrimental to rotating equipment at
high speeds. For running speeds greater than the values listed in the table below the discs
must be balanced. Under no circumstances must the running speed exceed the value given in
the right-hand column.
Table 3: Maximum Disc Speeds
Part Number Nominal OD
inch mm
Max. Speed
rpm
1.25” x 2.5” Series Standard Balanced
1.25-2.5-12 12 307 2140 4600
1.25-2.5-15 15 385 1610 3650
1.25-2.5-18 18 457 1290 3000
1.25-2.5-21 21 536 1090 2550
1.25-2.5-24 24 612 940 2250
1.25-2.5-27 27 688 820 1980
1.25-2.5-30 30 762 730 1780