Brake
Contents
1. 400V o _ auxiliary contactor 230 V 400 V 2 e g at motor contactor AC single phase connection voltage AC single phase connection voltage see name plate of brake see name plate of brake Motor must be connected at the same time Motor must be connected at the same time No brake release allowed at pole changing or No brake release allowed at pole changing or star delta switching star delta switching Operating Instructions 5 BOCKWOLDT Betriebsanleitung BOCKWOLDT Operating Instructions GETRIEBEMOTORENWERK BFK458 Spring loaded brakes with electromagnetic release 7 Spare Parts List 3 Rotor 4 Hub 5 Magnetic Coil complete 8 Hand Release complete 9a Flange Ob Friction Sheet 10 Cover Ring 11 Set of Screws When ordering magnetic coils please indicate the voltage When ordering hubs please indicate in addition the bore hole diameter Spare Parts Order Example e g BFK 458 06 Pos 3 Type Size technical changes reserved Version 04 2000 Operating Instructions 6 BOCKWOLDT2. BFK458 Spring loaded brakes with electromagnetic release 5 Maintenance Inspection Intervals Fortsetzung The air gap sLU between the armature plate and the magnetic coil must be at zero value when the brake is released Make sure that the rotor can glide on the hub toothing For adjustment of the air gap S U please see above SLU Nominal SLU max SLU max max adjustment Overlap of Tightening torque 0 1 mm Service Holding admissible abrasion adjustment ring 0 05 mm brake distance Mimas Screws Complete lever 1 The friction surface is made for at least 5 adjustments of the e Table 3 5 Attention please The brake must be in tensionless 6 Electric Connection state during connection to mains supply 6 1 With Bridge Rectifier 6 1 1 For single speed AC threephase motors without starting stage Direct connection at motor terminal board Normal brake engagement Fast brake engagement AC single phase switching DC switching ROI brake coil brake coil ee Li L3 L1 L3 L1 L3 L1 L3 L2 L2 L2 i L2 auxiliary contactor Y connection A connection Y connection e g at motor contactor A connection 6 1 2 For single speed AC threephase motors w ith starting stage pole changing motors Additional AC voltage connection required or for single phase motors with starting capacitor operating capacitor and starting relay Normal brake engagement Fast brake engageme
3. BOCK WOLDT GETRIEBEMOTORENWERK English GB Operating Instructions Q Spring loaded brakes with electromagnetic release Edition 04 2000 Betriebsanleitung BOCKWOLDT Operating Instructions GETRIEBEMOTORENWERK BFK458 Spring loaded brakes with electromagnetic release 1 Product Information and Principle of Operation BFK 458 spring applied brakes are single disk brakes with two friction surfaces The armature plate 1 is always one of the friction faces Several friction locking compression springs 2 generate the brake torque The brake is released electromagnetically The spring applied brake BFK 458 is made for conversion of mechanical work and kinetic energy into thermal energy The static brake torque allows to hold loads without rotational speed difference During the braking procedure the rotor 3 which can be shifted axially on the hub 4 is oressed against the friction face via the armature plate 1 by means of the inner and outer compression springs 2 The non asbestos friction surfaces provide high brake torques at low abrasion The brake torque transmission between hub 4 and rotor 3 is effected by the use of a gear tooth system When the brake is applied the air gap Sty appears between magnetic coil 5 and armature plate 1 The magnetic coil 5 is energised with due DC voltage in order to release the brake The resulting magnetic flux works against the spring force t
4. ent later on not even during adjustment of the air gap SLU since this may affect the safety funtion Instead please secure the effected alignment position by some threadlocker Pai Sre Lael 1 C E 15 4 3 Brake Torque Alteration The brake comes with fixed nominal torque Mn A reduction of the brake torque is possible until max Nimax image 2 Just unscrew the torque adjustment ring 6 by using a hook wrench Please see table 2 for the brake torque alteration values for each raster in the adjustment ring Table 2 BrakeSize GC o 10 12 14 16 18 20 235 Brake Torqye M _ Nm e _ te 82 60 80 150 260 400 _ Reduction per raster Nm 02 996 08 18 17 18 36 58 62 _ 76 96 11 10 149 164 5 Maintenance Inspection Intervals Wearout of the friction lining on the rotor results in an enlargement of the air gap Stu If the maximum admissible air gap is reached it has to be re adjusted to the nominal value The degree of abrasion and thus the intervals until necessary re adjustment of the air gap depend on the operation conditions switching frequency number of effected switchings rotational speed difference During inspection the friction surfaces should be checked for evenness and possible grooves Clean the brake from abrasion and dust Operating Instructions 3 BOCKWOLDT Betriebsanleitung BOCKWOLDT Operating Instructions GETRIEBEMOTORENWERK
5. nge 9a can be used if no suitable 9b ANE counter friction face is available This flange can be fitted by aN lt 1 screws on two reference circles In addition the flange can hold PNE the dust protection ring NL N 7 i h 3 If a smooth and machined counter surface is available but suitable 9a as a friction surface e g aluminium a friction sheet 9b is used al LLA Uj f The friction sheet 9b of rust proof steel also protects against 10 Nee contact corrosion even at longer machine downtimes X N Cover Ring 10 S N i E el es 5 Nz hi max The cover ring protects the brake against the exit or ingress of dust humidity dirt etc The ring is pulled over the completely assembled brake with the sealing lips being inserted into the respective grooves In case that no intermediate flange is used the counter surface must be equipped with a receiving groove Brass Plate 13 A brass plate can be inserted between armature plate 1 and magnetic coil 5 for fast separation which leads to reduced incidence times of the brake 4 Fitting Information 4 1 Installation of Brake If no suitable friction surface is available an intermediate flange 9a or a friction sheet 9b is used Draw hub 4 onto shaft fit feature xs up to 50 more than 50 me aufziehen and fix axially by means of a locking ring The torque transmission takes place
6. nt AC single phase switching DC switching brake coil SOOO eza Li N Li N na L1 N L1 N 230V oy 230V ETT o _ auxiliary contactor 9 e g at motor contactor AC single phase connection voltage AC single phase connection voltage see name plate of brake see name plate of brake Motor must be connected at the same time Motor must be connected at the same time No brake release allowed at pole changing or No brake release allowed at pole changing or star delta switching star delta switching Operating Instructions 4 BOCKWOLDT Betriebsanleitung BOCKWOLDT Operating Instructions GETRIEBEMOTORENWERK BFK458 Spring loaded brakes with electromagnetic release 6 2 With One Way Rectifier 6 2 1 For single speed AC threephase motors without starting stage Direct connectino at motor terminal board Normal brake engagement Fast brake engagement AC single phase switching DC switching lojojojoj jo brake coil brake coil N N Li L3 Li L3 L1 L3 L1 L3 L2 L2 L2 a L2 f auxiliary contactor 6 2 2 For single speed AC threephase motors w ith starting stage pole changing motors Additional AC voltage connection required or for single phase motors w ith starting capacitor operating capacitor and starting relay Normal brake engagement Fast brake engagement AC single phase switching DC switching brake coil l ae brake coil borer L1 N L1 L2 230V
7. o draw the armature plate 1 to the magnetic coil 5 Thus the rotor 3 is discharged from the spring force and can rotate freely It is possible to obtain smaller brake torques by simply reducing the spring force via the torque adjustment ring 6 1 SLU 13 5 1 Armature Plate 2 Compression Spring 7 11 ss Lora 3 Rotor a L zem 4 Hub 3 e A 2 HN SA 5 Magnetic Coil 4 y N 2NVB N 6 6 Torque Adjustment Ring gS i _N 7 Sleeve Bolt RQQQAA KAN 11 Fastening Screw 13 Brass Plate mage z Si Air Gap 2 Product Key BFK 458 06 E Construction Form Adjustable torque reducible via adjustment Size 06 08 10 12 14 16 18 20 25 Type Brake Spring Applied Brake Operating Instructions 1 BOCKWOLDT Betriebsanleitung BOCKWOLDT Operating Instructions GETRIEBEMOTORENWERK BFK458 Spring loaded brakes with electromagnetic release 3 Accessories Hand Release 8 g Image 2 The manual release is used to release the brake by hand e g at a power failure and can be retrofitted It springs back to the base positon automatically after operation By pulling at the hand release lever the armature plate is pulled against the magnetic coil leading to an air gap between rotor and armature plate The rotor can be turned easily The brake is released 11 Flange 9a Friction Sheet 9b X WS An intermediate fla
8. via a fitting key connection according to DIN 6885 Push rotor 3 onto hub 4 Insert the fastening screws 11 through the bore holes in the magnetic coil 5 and screw them into the relevant tapped bores of the counter friction surface Please remove the assembly clips which protect the sleeve bolts 7 against torsion during transport For safety reasons please now control the air gap Stu between armature plate 1 and magnetic coil 5 at three points by using a feeler gauge Operating Instructions 2 BOCKWOLDT Betriebsanleitung BOCKWOLDT Operating Instructions GETRIEBEMOTORENWERK BFK458 Spring loaded brakes with electromagnetic release 4 Fitting Information The air gap S is adjusted as follows Slightly loosen the fastening screws 11 Then use an open end wrench for screwing the sleeve bolts 7 into the magnetic coil 5 for reduction of the air gap respectively out of the magnetic coil for enlargement of the air gap Carefully re tighten the fastening screws 11 Afterwards please check the air gap S again as mentioned above Keep friction surfaces free from grease and oil residue Make electric connection If needed fix dust protection ring 4 2 Installation of Hand Release The hand release is pre assembled For mounting the dimension s see table 1 between armature plate 1 and disk 12 must be equal at both sides Never change the hand release alignm
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