rulmeca 80LS Manual De Instalación Y Mantenimiento página 11

q) Electromagnetic Brake:
The spring-loaded electromagnetic brake is intended for use as a conveyor belt holding brake and a positioning
brake.
The control circuit for the motorized pulley motor and brake must be designed to stop the pulley motor before brake
clamps are shut and start the pulley motor after the brake is released.
Spring-loaded electromagnetic brakes are designed to release when power is applied to the brake coil. This is a "fail
safe" feature. The clamp shuts when brake power is removed (either during normal operation or during an
emergency loss of overall system power.)
Control circuits must be designed so that motor and brake never work against each other. The brake should
never be clamped shut when the motor is on except for "emergency stop" condition. The motor should
never be powered on (including "jog" command) when the brake is clamped shut.
Electromagnetic brakes are DC-powered. They are supplied with AC to DC rectifiers to be mounted in a remote
panel (by others). Rectifiers must be fuse-protected.
Motor control circuits must be designed to kill motor power in the event of loss of brake power. If this safety provision
is not made, it is possible for pulley motor to be "powered through" a clamped brake, burning brake and/or motor.
A wiring diagram is supplied with every motorized pulley. Always ensure that motor and brake power and control
circuits are connected according to instructions.
For rectifier connection and protection instructions, refer to rectifier data sheet supplied with motorized pulley.
Failure to follow these instructions could cause damage to the motor and/or brake and voids product
warranty.
r) Reversing Conveyors:
All motorized pulleys for a three-phase power supply are reversible. Mechanical backstop option is not possible for
reversible conveyor applications.
The conveyor drive control system must be designed to bring the motorized pulley to a complete stop before
reversing conveyor belt direction.
Reversing conveyor direction without stopping the drive motor will damage motor and gearbox and voids
product warranty.
s) Oil and Oil Seal Maintenance:
Oil type and contents are given on the motor nameplate.
Standard, synthetic, food grade, low viscosity (for low temperature applications,) and high viscosity (for
noise-sensitive areas) are all available. For approved oil types and quantities, see enclosed list.
Motorized pulleys require periodic oil changes and are supplied with two oil fill/drain plugs in end housing.
The first oil change should be changed after 20.000 operational hours. This is due to normal
wear of gears.
All non-synthetic oils should be changed after each 20,000 operating hours.
Synthetic oils may be changed after each 50,000 operating hours.
Magnetic oil plug(s) should be cleaned during each oil change. A red dot plastic sticker indicates the position of the
magnetic oil plug.
Only approved non-conductive oil may be used in motorized pulleys.
Note that oil seals, regardless of oil type used, should be changed after 30,000 operating hours. On motorized pulley
types 320M to 1000H/HD oil seals may be changed without removing motorized pulley from conveyor. Motorized
pulley standard types 80LS to TM320L require pulley disassembly to change oil seals. RULMECA service personal
or authorized local service providers to perform this work.
Take special precautions when changing brands of oil and types of oil because of potential oil incompatibility.
Contact your local oil supplier for assistance.
For example, when changing from standard to synthetic oil, it is necessary to:
1. Completely drain old standard oil;
2. Partially fill pulley with "Clean-Flush-Lubricate" (CFL) fluid;
3. Run pulley for 20 minutes; Drain CFL fluid completely; then
4. Fill pulley with appropriate amount of new synthetic oil.
Failing to observe these oil and oil seal precautions could shorten pulley service life and voids product
warranty.
All the above instructions refer to motorized pulleys CONSTANTLY working under FULL LOAD. In case of
motorized pulleys NOT working continuously under full load, the service life will increase considerably!
When checking the oil, the cleanness of the oil is always the best guideline of
The wear and present position of the gears and bearings
o
Whether to change the oil immediately
o
Whether it is possible to delay the oil change.
o
– 9 –
EN