3500/65 145988-02 Current Detection Card

3500/65 145988-02 Current Detection Card

This section explains how to explain fault phenomena and isolate faults in installed sensor systems. Before starting this process, please ensure that the system is installed correctly and that all connectors are properly secured in the correct positions. When there is a functional abnormality, please find the corresponding fault, check the possible cause of the fault phenomenon, and then follow the steps to isolate and solve the fault. Use a digital multimeter to measure voltage. If a sensor malfunction is found, please contact your local Bently Nevada Corporation office for assistance. The troubleshooting process uses the measured voltage shown in the following figure and table:
Symbols for measuring voltage
The symbolic meaning measures the voltage between the following ports
V SIG
Signal voltage OUT and common from sensors
V PS
Power supply voltage, power supply and common
V XDCR
Sensor power supply voltage VT and common
Note: VSIG, VPS, and VXDCR are all negative voltage values.
definition
Example of symbol definition
A>B “A” value is closer to a positive number than “B” -21>-23
A<B “A” value is closer to negative than “B” -12<-5
A=B The value of “A” is the same (or very close) as “B” -24.1=-24.0
Fault type 1: V XDCR>-17.5 V DC or V XDCR<-26 V DC
Possible reasons:
Power failure
There is a fault in the on-site wiring
Proximitor ® The sensor is faulty
Measure V PS: V PS>-23 Vdc or<-26 Vdc?
Yes: Power failure
No: Go to the next step
Measure V XDCR: V XDCR>-23 Vdc or<-26 Vdc?
Yes: Field wiring failure
No: Proximitor malfunction
Fault type 2: V SIG=0 V DC
Possible reasons:
Incorrect power supply voltage
Short circuit in on-site wiring
Proximitor ® Short circuit in sensor terminal connection
Proximitor ® The sensor is faulty
Is fault type 1 present?
Yes: Use the method for fault type 1 mentioned above to solve it
No: Go to the next step
Measure V SIG: V SIG=0 Vdc?
Yes: Proximitor malfunction
No: The power supply voltage is incorrect, and there is a short circuit in the on-site wiring or the wiring of the preamplifier end
Fault type 3: -1 V DC<V SIG<0 V DC
Possible reasons:
Probe gap incorrect (too close to target)
Incorrect power supply voltage
Proximitor ® The sensor is faulty
The probe is detecting materials other than the target (countersunk or chassis)
Short circuit or open circuit (dry or wet) of connectors, or loss of connectors
Probe short circuit or open circuit
Extend cable short circuit or open circuit
Is fault type 1 present?
Yes: Use the method for fault type 1 mentioned above to solve it
No: Go to the next step
Is the probe gap correct? Is the size of the sink hole correct (refer to the section on probe installation in this manual)
No: Adjust the probe gap or check the sink hole. Retesting the system
Yes: Go to the next step
Measure V SIG: V SIG<V XDCR+1 Vdc?
No: Proximitor malfunction
Yes: Go to the next step
Check the cleanliness of the connection: Is there any dirt, rust, or looseness in the connection?
Yes: Clean the connectors with isopropanol or electrical terminal cleaner, reconnect and retest the system
No: Go to the next step
Measure resistance R Total: Is R Total within the specified range?
1 meter system: Moving to the next step
5-meter system: 8.75 ± 0.70 Ω
9-meter system: 9.87 ± 0.90 Ω
Yes: Retest the original system
No: Go to the next step
Measure the resistance R PROBE: Is R PROBE within the specified range (see Table 4-1: nominal DC resistance of the probe)?
No: Probe malfunction
Yes: Go to the next step
Measure the resistance R JACKET and R CORE: Is R JACKET and R CORE within the specified range (see Table 4-2: Extension)
What is the nominal DC resistance of a long cable?
No: Extension cable failure
Yes: Retest the original system
Fault type 4: V XDCR<V SIG<V XDCR+2.5 V DC
Possible reasons:
Proximitor ® The sensor is faulty
Probe gap incorrect (too far from target)
Is fault type 1 present?
Yes: Use the method for fault type 1 mentioned above to solve it
No: Go to the next step
Measure V SIG: -1.2<V SIG<-0.3 Vdc?
No: Proximitor malfunction
Yes: Reconnect the system. Readjust the probe gap. Retest the system
Fault type 5: V SIG=V XDCR
Possible reasons:
Incorrect power supply voltage
Proximitor ® The sensor is faulty
There is a fault in the on-site wiring (between Out and V T)
Is fault type 1 present?
Yes: Use the method for fault type 1 mentioned above to solve it
No: Go to the next step
Measure V SIG: V SIG=V XDCR?
Yes: Proximitor malfunction
No: Field wiring fault (short circuit between OUT and V T)

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