I am seeing an issue with the module reporting 4mA and 0mA. I have 3 devices in the field.
One has been working fine, one has been intermittent, and the 3rd has been stuck at 4 or 0 mA.
Has anyone seen this before?
I am questioning the load resistance.
Using 16V gives me 181 Ohms in the equation below…
Let me know if there are any questions.
Here are the power supply specs from the sensor manufacturer.
Operating voltage 11.6 … 35 V DC
Reverse voltage protection Integrated
Permissible residual ripple
- for 12 V < UN < 14 V ≤ 0.7 Veff (16 … 400 Hz)
- for 18 V < UN < 35 V ≤ 1 Veff (16 … 400 Hz)
- Calculation (UB - Umin)/0.022 A
- Example - Non-Ex instrument with UB= 24 V DC
(24 V - 12 V)/0.022 A = 545 Ω