5. TROUBLESHOOTING INFORMATION
Use a milliamp (mA) meter to measure the output current. When power is applied the output will go to 4.00 mA for at least one (1) second and then to either the measured level or an alarm condition output. If this does not happen the transmitter may not be receiving enough power or the main electronic is defective. Excessive current above 21.00 mA is also an indication of improper power up or defective electronics.
5.1Valid Current Loop Outputs
21.0 mA | If the top board jumper is set to HI ALARM a loss of signal, a |
| problem with the configuration or a malfunction will cause the |
| output to be set to the alarm condition of 21.0 mA |
20.6 mA | When the level increases above the 20.0 mA point the output |
| will continue up to 20.6 mA and then latch until the level returns |
| below the 20.6 mA level. |
4.0 mA to 20.0 mA | Normal output range between 3.8 and 20.6 mA |
3.8 mA / (4.0 mA) | When the level decreases below the 4.0 mA point the output will |
| continue down to 3.8 mA and then latch until the level returns |
| above the 3.8 mA level. [If LRS (Low Range Saturation) is set |
| for 4.0 mA, that will be the lowest output, regardless of actual |
| level.] |
3.6 mA | If the top board jumper is set to LO ALARM a loss of signal, |
| problem with the configuration, or a malfunction will cause the |
| output to be set to the alarm condition of 3.6 mA |
Output spiking up or down will usually result from improper THV or BLK settings. Refer to the initial setup section for details. If a module fails to communicate, verify from the model number that the particular communication option is included.
Note: Signal can be observed using an oscilloscope. Refer to Appendix F for setup procedure.
5.2 | Possible Symptoms |
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| SYMPTOM |
| ACTION |
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Output spiking high or raw counts |
| Extend the Blanking (BLK) in increments of 4 |
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jumping low |
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| Lower the Threshold |
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Output spiking low or raw counts |
| Raise the Threshold |
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jumping high |
| Introduce a parallel ground plane |
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Output mA erratic |
| Check BLK, THV, GS (section 4.4.2 ) |
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| Check for shorts between electronics (+ and – on back) and ground |
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Output greater than 21 mA |
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| Change the electronics module |
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| Power unit with an isolated supply |
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Output too low |
| Check for proper supply voltage |
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| Check terminal strip for leakage to cage. |
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Raw Counts and Output remain |
| Lower the Threshold |
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constant but in measuring range |
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| Check the probe for obstructions |
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| (continued on next page) |
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