Technical Guidelines

ABM Brakes

The ABM disk brakes type EFB and ZFB are electro-mechanical safety brakes that stop the drive quickly and in any operating mode. There can be no compromises when it comes to safety, therefore ABM has developed and manufactured brakes for 60 years. The result is a continuous improvement of brake performance. All brake components and functions are precisely matched to a particular drive.

The main characteristics and benefits for users include
• Adjustable torque
• Safe braking in the event of power loss
• Simple, manual adjustment
• Unlimited continuous operation
• Asbestos-free brake lining
• High operating frequency
• Long lining life
• Quick on and off switching times

Applications
• Cranes, hoists
• Handling & conveying systems
• Machine tools
• Packaging machines
• Textile machinery
• Warehousing systems

Options
• Manual release in position A, B, C or D
• High-speed excitation
• Friction plate corrosion-protected

Method of Operation
On the ABM EFB disk brake (single-sided brake) the magnet body is cast into the end shield on the B-side (non-drive). The aluminium impeller acts as the brake lining carrier. In de-energized condition a thrust spring supported by the brake end shield presses an axially moving armature plate against the special brake lining on the impeller.
The ABM ZFB disk brake (double sided brake) is mounted on the B-side (non-drive) end shield that also acts as one of the friction plates. The alloy brake rotor has a special lining on both sides and is located between the end shield and magnet body with an armature plate. In de-energized condition, springs press the armature plate against the brake rotor and bring it into contact with the end shield.

Classification of disk brakes

Power Supply
The standard power supply is 230 V AC, 50 Hz if connected to a rectifier. Other power supply voltages are available upon request. Through switching the AC or DC circuit, the brake switch off times can be matched to a specific application, making precise, rapid braking or delayed soft braking possible. Using a quick exciting rectifier can reduce switching times.

Installation of ABM Geared Motors
Gear motors should only be used in the mounting position for which they were designed. You should avoid restraining the gearbox unit and flanges during installation. Gear output shafts and machine shafts need to be aligned for proper coupling. Axes of gears and belt pulleys must be parallel with gearbox output shafts.
Clutches, gears or belt pulleys must be carefully mounted to the shaft to prevent any damage to the bearing. For mounting, please use the tapped hole on the output shaft. Otherwise heat up your components before mounting.
The openings of the cooling fan have to be free at all times, keep clean from dust and other contaminants to prevent over heating and damage to motors.

Wiring of ABM Geared Motors
Just one cable access is necessary for direct starting of a geared motor. The second opening on the junction box can be covered up with a dummy plug. The motor frame must be grounded using the marked screw in the junction box. Before installing a geared motor the phase sequence must be checked. With standard connection of phases L1, L2, L3 to clamps U1, V1, W1 the motor output shaft will rotate clockwise.

Maintenance of ABM Geared Motors
ABM Geared Motors are filled and delivered with lubricant. Lifetime of the supplied lubricant is 10,000 operating hours for gear oil and 8,000 operating hours for grease. It is not necessary to add lubricant and overfilling could cause overheating of the gearbox.

Notes regarding the dimensional charts
Pictures are for informational purposes only. We reserve the right to change technical data at any time.
Dimensional charts are valid for the following motor types:
• Three-phase motors
• Single-phase motors without capacitor(s)
• Two-speed motors
Dimensions g₂ and p₃ refer to frame sizes 56 to 132 on the plastic junction box.
Frame size 160 is only available with an aluminium junction box. Dimensions of keyways are per DIN 6885, page 1.

Selection of Geared Motors
When selecting the type of geared motor you must have detailed knowledge of the application. In operation a specific collective load characterizes each machine. Therefore, the operating factor considers the effects on the machine with sufficient exactness.
In selecting a geared motor it is important that the operating factor of the selected gear unit is equal to or larger than the value listed in the chart.

Allocation of Service Factor



















The service factor is the result of f_B1 x f_B2.
An additional factor of 1.4 must be considered in case of operation with dual torsion forces.
A smaller gearbox can be used for short time operations.
For further information please contact us.

Output Speed
The stated output speed range considers the smallest gear ratio (max. output speed), the highest possible reduction ratio and the maximum transmittable torque at an assumed service factor of fB = 1 (smallest output speed). To calculate the exact output speed it is necessary to consider the appropriate motor speed.

Example:

Required output torque:
      T₂ = 9550 * 1.5 kW/ 90 RPM = 159 Nm

Required gear reduction with 4-pole motor:
      i = 1390 RPM / 90 RPM = app. 15,4
(The exact motor speed can be found in the motor brochure.
 If i is > approximately 50, a 3-stage geared motor is required)

The service factor for this application can be found in the chart:
      f_B = f_B1 x f_B2 = 1,2 x 1,15 = 1,38
The necessary output torque is T₂ <= T₂ x f_B = 159 Nm x 1,38 = 219 Nm

The gear box chart "Gear Reduction Ratios and Maximum Allowable Torque" shows that for this individual case a two-stage, shaft-mounted helical geared motor type FGA 252 with i = 15.16 and T_2max = 250 Nm is needed. Thus by referring to the motor program overview chart in the brochure "Asynchronous Motors TechLine 1", you would select brake motor type EFB3/4D90La-4.

Should you require assistance for such a selection, our application specialists will gladly help.

Conversion Information: Metric/US common units