Weidmuller WAVE TTA, Руководство пользователя

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Operation
18 5662300000/01/08.10
5.1 Status & alarm LEDs
Status LED
Under normal conditions this (green) LED is on con-
tinuously.
A
B
C
Figure 3 LEDs
A
Status LED
B
ALARM 2
C
ALARM 1
The following table shows how alarm conditions are
displayed.
Status indicator Alarm conditions
Normal status continuously on
Input open circuit flashes at 0.5 Hz
Input short circuit flashes at 5 Hz
Cold Junction error 2 pulses, rests, 2 pulses
Flash memory error 3 pulses, rests, 3 pulses
Table 1 Status indicators
Analogue Output status with alarm
•
User may select output value under fault condi-
tions
•
Output compliant with NAMUR recommendations
(NE43) can be set (< 3.6 mA or > 21 mA)
Input fault detection
Input faults such as short circuit or open circuit can
be detected for most input types. These are shown
in the table below.
Input type Detection
Open circuit Short circuit
Thermocouple Yes Yes
RTD Yes Yes
Millivolts Yes No
Volts (Positive) Yes No
Milliamps
(Passive) Yes* No
Milliamps (Active) Yes Yes
Resistance Yes Yes
Potentiometer Yes Yes**
Table 2 Input fault detection
* Open circuit not detected for live zero ranges
** Short circuit for end-to-end