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Power failure
The setting data is backed up in the non-volatile IC memory.
countermeasure
Self-diagnosis
The CPU is monitored by a watchdog timer, and if an abnormal status is found on the
CPU, the DI25 is switched to warm-up status.
Automatic cold
This detects the temperature at the connecting terminal between the thermocouple and the
junction temp.
instrument, and always maintains it at the same status as if the reference junction location
compensation
temperature was at 0
Event input
Selects event input function from 3 types of HOLD function and 2 types of alarm HOLD
function
function.
For further specifications see WIKA data sheet AC 80.02.
9. Troubleshooting
If any malfunction occurs, refer to the following items after checking that power is being supplied to the DI25.
Problem
The PV display
indicates
.
The PV display
indicates
.
The PV display
flashes
.
(32 ).
Possible cause
Internal memory is defective.
Burnout of thermocouple, RTD
or disconnection of DC voltage
(0 to 1 V DC)
Check
whether
the
terminals
of
thermocouple,
RTD or DC voltage (0 to 1 V
DC) are securely connected to
the instrument input terminals.
Check whether input signal
wire for DC voltage (1 to 5 V
DC) or direct current (4 to 20
mA DC) is disconnected.
Check whether input signal
wire for DC voltage (1 to 5 V
DC) or DC current (4 to 20 mA
DC) is securely connected to
the instrument input terminals.
Check if polarity of thermo-
couple or compensating lead
wire is correct. Check whether
codes (A, B, B) of RTD agree
with the instrument terminals.
Contact us or our agency in your region.
Replace each sensor.
How to check whether the sensor is burnt out
[Thermocouple]
If the input terminals of the instrument are shorted, and
if a value around room temperature is indicated, the
instrument is likely to be operating normally, however,
the sensor may be burnt out.
[RTD]
If approx. 100
terminals between A-B of the instrument and between
B-B is shorted, and if a value around 0
indicated, the instrument is likely to be operating
normally, however, the sensor may be burnt out.
[DC voltage (0 to 1 V DC)]
If the input terminals of the instrument are shorted, and
if a scaling low limit value is indicated, the instrument
is likely to be operating normally, however, the signal
wire may be disconnected.
input
Connect the sensor terminals to the instrument input
terminals securely.
How to check whether the input signal wire is
disconnected
[DC voltage (1 to 5 V DC)]
If the input to the input terminals of the instrument is 1
V DC and if a scaling low limit value is indicated, the
instrument is likely to be operating normally, however,
the signal wire may be disconnected.
[Direct current (4 to 20 mA DC)]
If the input to the input terminals of the instrument is 4
mA DC and if a scaling low limit value is indicated, the
instrument is likely to be operating normally, however,
the signal wire may be disconnected.
Ensure that the input signal wire is securely connected
to the instrument input terminals.
Wire them correctly.
24
Solution
resistance is connected to the input
(32 ) is
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