CD Automation srl
pag. 27 di 121
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.
OUT1
OUT2
condition
Heating/
Cooling
SEcF
reverse
direct
reverse
direct
under-range
NO
0
ON
OFF
---
---
over-range
NO
0
OFF
ON
---
---
under-range
SI
0
ON
OFF
over-range
SI
0
OFF
ON
under-range
---
1
SEcO
SecO
over-range
---
1
SEcO
SecO
under-range
---
2
standard
standard
over-range
---
2
SEcO
SecO
under-range
---
3
SEcO
SecO
over-range
---
3
standard
standard
Table 1: security state Stati di sicurezza of the output in out-of-range condition.
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
)
