Endress+Hauser RMS621 - Page 56

Trouble-shooting RMS621
56 Endress+Hauser
Cable open circuit: "channel name" "signal name) Input current at current input smaller than 3.6 mA
(with setting 4 to 20 mA) or larger than 21 mA.
• Incorrect wiring
• Sensor not set to 4–20 mA range.
• Sensor malfunction
• Incorrectly configured end value for flow
transmitter
• Check sensor configuration.
• Check function of the sensor.
• Check end value of the connected flow meter.
• Check wiring.
Range error 3.6 mA < x < 3.8 mA
(with setting 4 to 20 mA) or
20.5 mA < x < 21 mA
• Incorrect wiring
• Sensor not set to 4–20 mA range.
• Sensor malfunction
• Incorrectly configured end value for flow
transmitter
• Check sensor configuration.
• Check function of the sensor.
• Check measuring range/scaling of the
connected flow meter.
• Check wiring.
Cable open circuit: "channel name" "signal name Resistance too high at PT100 input, e.g. due to
short-circuit or cable break
• Incorrect wiring
• PT100 sensor defect
• Check wiring.
• Check function of the PT100 sensor.
Temp. difference range undercut Range of the set differential temperature overshot Check current temperature values and set
minimum temperature differential.
Limit value over/under cut
Limit value ’number’ ok (blue)
• "Limit value identifier" < "threshold value"
"unit"
• "Limit value identifier" > "threshold value"
"unit"
• "Limit value identifier" > "gradient" "unit"
• "Limit value identifier" < "gradient" "unit"
• "User defined message"
Limit value undershot or overshot
(→ Set point configuration, Section 6.3.3)
• Acknowledge alarm if the function “Set point/
Lim. display/Disp.+Ackn.“ was configured
(→ Set point configuration, Section 6.3.3).
• Check application if necessary.
• Adjust set point if necessary.
• Temp. difference range undercut (red)
• Temp. difference ok (blue)
Range of set differential temperature overshot. Check current temperature values and set
minimum temperature differential.
W-heat diff: error: neg. temp. diff. The temperature assigned to the temperature
sensor on the cold side is larger than the
temperature on the warm side.
• Check whether the temperature sensors are
correctly wired.
• Adjust process temperatures.
W-heat diff: error flow direction In bidirectional water-heat-diff. operation;
If flow direction is configured as changing and the
direction of flow does not suit the temperature
values.
• Change flow direction signal at the direction
terminal.
• Check the wiring of the temperature sensors.
• Pulse width must be between 0.04 and
1000 ms!
• Pulse width must be between 100 and
1000 ms!
Active/passive pulse output: configured pulse
width not within valid range.
Change the pulse width to the value range given.
Entry must lie between 1 and 15! Incorrect number of points. Correct value to a value in this value range.
Pulse buffer overflow Too many pulses accumulated so the pulse counter
overflows: pulses lost.
Increase pulse factor
Other messages/events (only appear in the event buffer)
• Low flow: undershot! Low flow cut off configured is undershot, i.e. flow
valued at zero.
Reduce low flow cut off if necessary. (see Section
6.3.3)
Display Cause Remedy