Differential Feedback Detected

What does DIFF mean?

This fault (or minor fault/alarm) occurs when the difference between the PID Feedback and the Differential Feedback (monitor H3-OO = 28) exceeds the level set in parameter P4-18 for the duration specified in P4-19. It indicates an inconsistency in the feedback signals used for PID control.

• Malfunctioning or incorrect feedback transducer(s)
• Parameter P4-18 (differential level) set too low for the application
• Parameter P4-19 (differential time) set too short for the application

Click steps to track your progress.

1. 1

   Replace the PID feedback transducer or transducers if suspected of malfunction.

2. 2

   Verify parameter P4-18 (Differential Level) setting to ensure it is appropriate for the system.

3. 3

   Verify parameter P4-19 (Differential Time) setting to ensure it is appropriate for the system.

4. 4

   Verify parameter P4-20 (Differential Hold) setting.