5.3
Alarm output (Fail Safe High or Low)
If the paddle of the level switch is not covered, the rotating paddle shaft
triggers pulses at 20-second intervals. In the event of a fault, the pulses are
stopped and the alarm relay de-energizes after 30 seconds.
Figure 5-3: Switching Logic (Universal Voltage Version)
7
A
B
C
6 5 4
7 6 5 4
A. Yellow or green, i.e. no fault. See
B. Red, i.e. fault
C. LED location on PCB
Figure 5-4: Connection Example
7 6 5 4
When a Rosemount 2501 is used in a full-silo detection application with
maximum safety, the output signal can indicate:
•
Full-silo signal
•
Failure of supply voltage
•
Incorrect wiring
•
The level switch has developed a fault
Quick Start Guide
October 2019
30
Quick Start Guide
