Combined Clutch Brakes
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TH E M A G NE T I C I M PA C T O F S G TRANSMISSION SG TRANSMISSION MODULE 54 COMBINED CLUTCH BRAKE PACKAGES SG Transmission 54 Modules combined clutch and brake packages are normally used in belt or chain driven applications where the rotary motion is derived from a remote location or from a co-axially coupled motor. They are used whenever the prime mover is required to run continuously and the unit which it is driving is to have a controlled “stop - start’ action. Allowing an electric motor to run and controlling its output with a combined clutch brake unit reduces the power consumption of the system considerably. Because these units are precisely manufactured with a positive “stop - start” action they can be controlled with relatively simple solid state electronics to give accurate repeatable positioning. WEAR ADJUSTMENT Independent armature plates are used, therefore any wear caused during the switching from clutch to brake can be independently corrected. Adjustment is achieved by the rotation of a locknut against the action of internally mounted disc springs which maintain the correct air-gap between each armature plate and the clutch or brake. SAFETY Clutch and brake linings are hard wearing and do not contain asbestos. MAINTENANCE SG Transmission clutch brake units are virtually maintenance free. However they are sometimes used to control large inertia loads with relatively high switching frequencies and in these cases the air-gaps between the clutch/brake face and armature plate should be periodically checked and adjusted as necessary. Issue 2 - May 2008 ADJUSTMENTS 1. With clutch coil de-energised measure the air-gap, in three places, between the clutch face and armature plate using a feeler gauge. 2. If the air-gap exceeds the nominal dimension (‘g’ on the Type 54 data sheet) by more than 0.20mm an adjustment maybe necessary. 3. Adjustment is relatively simple, secure the shaft to prevent rotation during the adjustment, unlock the clutch locknut and rotate to move the armature and hub assembly along the shaft thereby adjusting the air-gap of the clutch. The locknut is used in conjunction with a lockwasher. The lockwasher has a tab which must be released before adjustment is attempted. ADVANTAGES EASY INSTALLATION The unit comes ready assembled in a neat package which can be foot mounted or designed to incorporate a mounting flange to accommodate specified requirements. TOUGH CONSTRUCTION Type 54 units are robustly designed and use deep groove ball bearings on the input and output sides of the unit. They can be mounted in any angular plane. 4. After resetting the air-gap, secure the locknut and energise / de-energise the clutch coil several times to ensure correct operation. 5. Re-check the air-gap (as in 1.) and repeat the procedure for the brake (using the nominal dimension ‘g’ from the Type 54 data sheet).

THE MAGNETIC IMPACT OF SG TRANSMISSION MODULE TYPE 54 DOUBLE CLUTCH (HEXAGONAL HOUSING) Keyways to B.S. 4235 • Shaft centre-holes to DIN 332 • Insulation Class B

THE MAGNETIC IMPACT OF SG TRANSMISSION MODULE TYPE 54 CLUTCH BRAKE Keyways to B.S. 4235 • Shaft centre-holes to DIN 332 • Insulation Class B MODULE TYPE

THE MAGNETIC IMPACT OF SG TRANSMISSION Optional B.S. Keyseat, Flat or Circlip + Key, on request Keyways to B.S. 4235 • Shaft centre-holes to DIN 332 • Insulation Class B