PP846 operation panel PP846A touch screen 800PP846A supply

It seems like you’ve provided information about maintaining optimal operating conditions for an operator panel within a device cabinet, particularly emphasizing the impact of ambient temperature on electronics and the importance of cooling systems.

Here’s a breakdown and summary of the key points mentioned:

1. Ambient Temperature:
   • The maximum ambient temperature for the operator panel is specified in the product specifications.
   • The ambient temperature in the device cabinet, which cools the panel’s electronics, may be significantly higher than the cabinet’s ambient temperature.
2. Heat Generation and Cooling:
   • Tall cabinets with heat-generating devices can lead to higher temperatures at the top of the cabinet.
   • Electronics are sensitive to heat, affecting the lifespan of components like electrolytic capacitors.
3. Cooling Solutions:
   • Rittal offers programs for estimating average cabinet temperature and controlling it effectively.
   • Enamel-coated steel cabinets have a radiant heat value, and installing a fan (e.g., a 120 x 120 mm axial fan) can help in temperature regulation.
   • Fans should be installed to blow cold air against the operator panel, and consideration should be given to the fan’s ambient temperature to avoid reduced lifespan.
4. Fan Lifespan:
   • A good fan with ball-bearing mounting has an expected lifespan of at least 40,000 hours at 40 °C, equivalent to at least 4 years of continuous use.
   • Installing a thermostat ensures the fan operates only when needed.
5. Power Consumption and Loss Effects:
   • Large graphic terminals consume less current when background lighting is off.
   • Operator panel’s loss effect is determined by supply voltage and current, with minimal power going to external users.
6. Cabling Recommendations for RS485:
   • Use shielded and twisted pair cable with specified characteristics for maximum transfer distance and speed.
   • Proper grounding of the shield is essential, with considerations for ground potential differences and the use of capacitors to prevent ground current.
7. RS485 Bus Termination:
   • Recommendations for shield grounding may vary among manufacturers.
   • The RS485 standard focuses on the system’s ability to handle errors without detailing the “Fail Safe” function.

In summary, maintaining optimal temperatures, using appropriate cooling mechanisms, and ensuring proper cabling practices are crucial for the reliable operation and longevity of electronic components in the device cabinet.