Detection Of Malfunctions - CD Automation Revo TC 3ph User Manual

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13 Detection of malfunctions

The instrument can detect the following abnormal conditions of the process variable:
• over-range
• under-range
• sensor leads break
The condition of over-range is displayed by the characters "Undr" flashing in the upper display.
The condition of over-range is displayed with "oVrr" in the upper display.
Table 1 shows the state of OUT1 and OUT2 at the conditions of range of under-and over-range, according
to the device settings (control mode heating / cooling and SEcF parameter value). The first four lines
delineate the standard configuration.
Heating/
condition
Cooling
NO
under-range
NO
over-range
under-range SI
over-range SI
under-range ---
over-range ---
under-range ---
over-range ---
under-range ---
over-range
---
Breakage of the temperature sensor can be reported as:
• over-range o under-range (configurable) for input TC/mV
• over-range for input RTD
• under-range for input mA / V (only with zero elevation)
SEcF
0
0
0
0
1
1
2
2
3
3
Table 1: security state Stati di sicurezza of the output in out-of-range condition.
OUT1
reverse direct
ON OFF
OFF ON
ON
OFF
SEcO
SEcO
standard
SEcO
SEcO
standard
pag. 27 di 122
OUT2
reverse direct
--- ---
--- ---
OFF
ON
SecO
SecO
standard
SecO
SecO
standard