rulmeca 80LS Manual De Instalación Y Mantenimiento página 7

Always refer to the connection instructions and ensure that the motor is connected as required
to the correct mains supply.
As a safety measure, please use the earth screw located in the terminal box.
The protective conductor has to be connected to the earth screw.
When using cable options the green/ yellow wire has to be connected to the protective conductor
of the main supply.
All safety devices, including wiring of electrical safety devices itself will not result in a hazardous condition.
e) Motor Current Overload and Over current Protection:
Motor control systems must include protection against operating pulley motors in excess of Full Load Amperage
(FLA.). The control system should also include protection against voltage spikes and excessive jogging of motors.
Failing to provide adequate current overload and over current
protection could stress the motor and voids product warranty.
FLA data is available for all motors upon request. FLA data is also supplied on motor label
for each motorized pulley.
Electrical power, control, and protection for motorized pulleys must adhere to all pertinent regulations.
f) Motor Thermal Protection:
All motorized pulley motors are supplied with a built-in thermal protector in each phase. Protection consists of
heat-sensitive, bi-metallic switches built into each motor phase winding. The switches are designed to open if motor
temperature elevates to an inappropriately high level. 2.5 Amps are the permissible current of standard versions.
The voltage is 230V.
These switches must be connected to a normally closed control circuit (in series with a magnetic coil/relay device
and contactor) in order to validate product warranty.
A motor control circuit should kill motor power if thermal switch opens. Thermal switches will automatically close as
motor cools. Cooling times vary with pulley model, power, and size. However, 30 to 60 minutes is common with
most motors in an ambient temperature of 20°C.
g) Belt Tension:
The conveyor belt should never be over-tensioned. It should be installed with sufficient belt tension only to
prevent belt slippage.
Refer to page ... for the list of belt tension!
To keep the radial load as low as possible to drive the belt without slipping
anti-slip lagging should be used.
Maximum allowable radial load of each motorized pulley (MP) is specified in this catalogue. Subjecting the motorized
pulley to a higher than specified maximum radial load may damage internal components and shorten product lifetime
and, therefore, voids product warranty.
To check pulley radial load, do a vector summation of the loads on the pulley.
For example, as shown in the diagram,
1. Radial load equals T1 + T2.
2. T1, tight side tension, equals Belt Pull (F
3. T2, slack side tension, is determined using CEMA standard calculations or DIN 22101 to provide
enough friction between the pulley and the belt to drive the belt.
Belt type, belt thickness and the right diameter of the pulley have to be selected according to Belt Supplier
Requirements.
h) Belt Alignment:
Motorized pulleys must be installed with pulley shaft perpendicular to belt centreline and parallel to all idler rollers.
Belt centreline must be straight and parallel to side walls of slider bed (if any) and perpendicular to idler rollers and all pulleys
Belt and/or roller misalignment may cause high friction and overload the conveyor belt drive motor.
Belt misalignment may cause premature wear of pulley lagging.
i) Start-up:
Prior to initial start-up of motorized pulley:
• Verify that motorized pulley nameplate data matches customer specification.
• Ensure electrical connections are correct.
• Check that motorized pulley is free to rotate.
• Check that slack side belt tension is adequate to prevent belt slippage.
• Check that belt is not over-tensioned.
• Ensure the oil is present in the motorized pulley.
) plus T2.
U
– 5 –
EN
L1; L2; L3
PEN
K11
K
M
3
TP