THE DIRECTION IN WHICH PILZ SAFETY RELAYS ARE INSTALLED, THE ENVIRONMENT IN WHICH THEY ARE USED AND THE CONNECTING WIRES USED ALL AFFECT THE OPERATION AND SHOULD BE TAKEN CARE OF WHEN INSTALLING.
(1) The installation direction of the thermal relay
IT'S EASY TO OVERLOOK THE ORIENTATION OF PILZ SAFETY RELAYS. In a thermal relay, an electric current is passed through the heating element to generate heat, which pushes the bimetal sheet to act. There are three ways of heat transfer: convection, radiation, and conduction. Where convection is directional, heat is transmitted from bottom to top. When placed, if the heating element is under the bimetal sheet, the bimetal sheet will heat up quickly and the action time will be short; If the heating element is next to the bimetal, the bimetal sheet heats up more slowly and the thermal relay takes a long time. When the thermal relay is installed with other electrical appliances, it should be installed under the electrical appliances and more than 50mm away from other electrical appliances to avoid the influence of other electrical appliances. The installation direction of the thermal relay should be carried out according to the provisions of the product manual to ensure that the action of the thermal relay is consistent when in use.
(2) Use environment
IT MAINLY REFERS TO THE AMBIENT TEMPERATURE, AND THE SPEED OF THE ACTION OF THE PILZ SAFETY RELAY HAS A GREAT INFLUENCE. The temperature of the medium around the thermal relay should be the same as the temperature of the medium around the motor, otherwise it will destroy the adjusted fit. For example, when the motor is installed at a high temperature and the thermal relay is installed at a low temperature, the operation of the thermal relay will lag (or the operating current will be large); Otherwise, its action will be earlier (or the action current will be small).
For thermal relays without temperature compensation, they should be used in places where the ambient temperature difference between the thermal relay and the motor is not large. For the thermal relay with temperature compensation, it can be used where the ambient temperature of the thermal relay and the motor is different, but the impact of the change in ambient temperature should be reduced as much as possible.
(3) Connecting wires
In addition to conducting electricity, the connecting wire of the thermal relay also plays the role of thermal conduction. If the connecting wire is too thin, the heat generated by the connecting wire will be transferred to the bimetal sheet, and the heating element will dissipate less heat along the wire, thus shortening the tripping action time of the thermal relay; Conversely, if the cable used is too thick, the tripping time of the thermal relay will be extended. Therefore, the cross-section of the connecting wire should not be too thin or too thick, and the cross-sectional area specified in the manual or similar should be used as far as possible.
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