I'm trying to understand what a proportional band is....

  • Thread starter Thread starter TSN79
  • Start date Start date
  • Tags Tags
    Band Proportional
Click For Summary
SUMMARY

The discussion clarifies the concept of proportional band in temperature control systems, specifically in relation to a fan regulator with a temperature sensor and potentiometer. The proportional band, adjustable between 1-8°C, determines the allowable temperature drift from the setpoint before the fan activates or deactivates. For instance, with a setpoint of 30°C and a proportional band of 5°C, the fan speed varies from 0% at 30°C to 100% at 25°C. Additionally, the discussion distinguishes between proportional band and deadband, highlighting that deadband control operates within a fixed range to maintain temperature stability.

PREREQUISITES
  • Understanding of temperature control systems
  • Familiarity with fan regulators and their components
  • Knowledge of voltage signal modulation (0-10V)
  • Basic concepts of setpoint and temperature measurement
NEXT STEPS
  • Research "PID control theory" for advanced temperature regulation techniques
  • Explore "temperature sensor types" to understand their applications
  • Learn about "fan speed control algorithms" for optimizing HVAC systems
  • Investigate "deadband control mechanisms" for effective temperature management
USEFUL FOR

Engineers, HVAC technicians, and anyone involved in designing or maintaining temperature control systems will benefit from this discussion.

TSN79
Messages
422
Reaction score
0
I've always struggled with understanding proportional band - even after watching a number of videos trying to explain it. Now I've got a fan regulator that has a temperature sensor and a potentiometer. It works by sending a signal (0-10V) to the fan if the ambient temperature drops below a certain value. It also has a knob where the temperature proportional band can be set between 1-8°C. I think it means how much the temperature is allowed to drift past the set point before the fan starts or stops. Is that about right...?
 
Engineering news on Phys.org
The fan speed signal (controller output) is proportional to the difference between the setpoint (what you want) and the measured (what you have) signals. Example: Setpoint is 30 deg C and proportional band is 5 deg C. Then output could be fan 0% speed at 30 deg C, 20% speed at 29 deg C, and 100% speed at 25 deg C.

Deadband is different. The thermostat in my house has deadband control. It turns the heater on at 70 deg F, and off at 71.5 deg F. Below 70 deg F, the heater is always on. Above 71.5 deg F, the heater is always off. In between, the heater could be either on or off.
 
  • Like
Likes   Reactions: Asymptotic and DrClaude

Similar threads

  • · Replies 3 ·
Replies
3
Views
3K
  • · Replies 5 ·
Replies
5
Views
3K
Replies
2
Views
3K
  • · Replies 3 ·
Replies
3
Views
5K
  • · Replies 21 ·
Replies
21
Views
8K
  • · Replies 152 ·
6
Replies
152
Views
11K
  • · Replies 1 ·
Replies
1
Views
1K
Replies
2
Views
19K
  • · Replies 35 ·
2
Replies
35
Views
5K
  • · Replies 12 ·
Replies
12
Views
3K