11
D5062
- SIL 2 Vibration Transducer Interface
G.M. International ISM0184-7
T– proof
The proof test shall be performed to reveal dangerous faults which are undetected by diagnostic. This means that it is necessary to specify how dangerous undetected fault, which
have been noted during the FMEDA, can be revealed during proof test.
The
Proof test
consists of the following steps:
Steps
Action
1
Bypass the safety-related Vibration Monitor/PLC or take any other appropriate action in order to avoid a false trip.
2
Connect a calibrated DC input voltage to the interface (terminals 7/9 and 8); in the 0 to -20 Vdc range, check with a 1 Vdc step that the output voltage corresponds
to each input step with a deviation smaller than 1%. This test detects any failure in the basic DC loop transfer function.
3
Connect a frequency generator to the interface (terminals 7/9 and 8); impose a 1 kHz square wave input signal with amplitude in the 0 to -20 Vpp range and -10 Vdc
offset, then check with an oscilloscope that the output waveform maintains the peak-to-peak value with a deviation smaller than 1%. In addition, impose a zero input
signal and verify that the output ripple is
≤
20 mVrms. This test detects any other possible failure in the loop transfer function.
4
Connect a current sinking source (i.e.: 0 ÷ 20 mA current calibrator) between terminals 10 (negative supply) and 7/9 (common) and connect a DVM across the
calibrator terminals. Set the current sink at 1 mA and check if the voltage measure is
≤
-21 Vdc at terminal 10, referred to terminal 7/9. Then, set the current sink at
15 mA and check if the voltage measure is
≤
-16 Vdc at terminal 10, referred to terminal 7/9. This test detects any failure in the input channel circuit.
5
Restore the loop to full operation.
6
Remove the bypass from the safety-related Vibration Monitor/PLC or restore normal operation.
This test will reveal around 99% of the possible Dangerous Undetected failures.
Configuration
D5062S
ON
3 wires transducers
1 = OFF, 2 = OFF, 3 = OFF, 4 = OFF.
1 2 3 4
ON
OFF
1 2 3 4
ON
OFF
2 wires transducers (4 mA)
1 = ON, 2 = OFF, 3 = OFF, 4 = OFF.
1 2 3 4
ON
OFF
2 wires transducers (6 mA)
1 = ON, 2 = ON, 3 = OFF, 4 = OFF.
1 2 3 4
ON
OFF
2 wires transducers (10 mA)
1 = ON, 2 = OFF, 3 = ON, 4 = OFF.
1 2 3 4
ON
OFF
2 wires AC transducers
1 = OFF, 2 = OFF, 3 = OFF, 4 = ON.
DIP switch configurations (all valid for SIL applications):
This mode is factory settings
