Evaluation Trigger Signal - Siemens 7MJ2000-1A 00 Series Operating Instructions Manual

Signal processing
7.2 Evaluation of universal inputs
7.2.5

Evaluation trigger signal

Relates to following parameters
Parameter no.
P.29
P.45 to P.49
Evaluation
The trigger sensor issues a 24 V trigger pulse for ≥10 ms, whose center represents the crank
angle 0°. If the trigger pulses are issued at an interval of more than 30 s, a fault message will
be issued. The phase angle of the acoustic emission signals will then be determined based
on the trigger signal "In4" and the acoustic emission signals "So1" to "So4".
The values of the phase angles will then be compared with the values of the valve closing
angles. The values for the closing angles of the suction valves will be set in parameters P.45
to P.49. The closing angle of the pressure valve is the closing angle of the suction valve
+180 °. The valve is defective if the measured phase angle equals one of the set closing
angles.
70
Parameter name Traversing range/display
range
INP4 tri
"ANG1" to "ANG5" oFF, 0 ... 360
Remark
Use trigger sensor
Closing angle of suction valve at
each cylinder
SITRANS DA400 for oscillating positive displacement pumps
Operating Instructions, 09/2008, A5E00841120-03