ERROR MESSAGES
OVERRANGE, UNDERRANGE AND SENSOR LEADS BREAK INDICATIONS
The device is capable to detect a fault on the process variable (OVERRANGE or UNDERRANGE or SENSOR LEADS BREAK). When the process variable exceeds the span limits established by configuration parameter P 1 an OVERRANGE condition will be shown on display as show in the following figure:
An UNDERRANGE condition will be shown on display as show in the following figure:
When P37 is equal to 0, the following conditions may occur:
-The instrument is set for one output only and if an OVERRANGE is detected, the output turns OFF (if reverse action) or ON (if direct action).
-The instrument is set for heating/cooling action and an OVERRANGE is detected, "rEV" output turns OFF and "dir" output turns ON.
-The instrument is set for one output only and if an UNDERRANGE is detected, the output turns ON (if reverse action) or OFF (if direct action).
-The instrument is set for heating/cooling action and an UNDERRANGE is detected, "rEV" output turns ON and "dir" output turns OFF.
When P37 is different from zero and an out of range condition is detected, the instrument operates in accordance with P37 and P38 parameters.
NOTE: in every cases, the P18 and P20 parameters will conditioned the real outputs of the instrument.
The sensor leads break can be signalled as:
-for TC/mV input : OVERRANGE or UNDERRANGE selected by a solder jumper
- for RTD input | : | OVERRANGE |
- for mA/V input | : | UNDERRANGE |
NOTE : For mA/V input the leads break can be detected only when the range selected has a zero elevation (4/20 mA or 1/5 V or 2/10 V)
For RTD input a special test is provided to signal OVERRANGE when input resistance is less than 15 ohm (Short circuit sensor detection).
ERROR MESSAGES
The instrument performs same
When an error is detected, the instrument shows on the lower display the “Err” indication while the upper display shows the code of the detected error.
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