- 142 -
Problem
Possible Cause
Solution
The PV Display flashes
.
PV has dropped below the
Indication range and Control range.
Check the input signal source and
wiring of 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.
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.
Check whether input signal wire for
DC voltage (1 to 5 V DC) or current (4
to 20 mA DC) is securely connected
to the instrument input terminals.
Connect the input signal wire to the
terminals of this instrument securely.
Check if polarity of thermocouple or
compensating lead wire is correct.
Check whether codes (A, B, B) of RTD
agree with the instrument terminals.
Wire them correctly.
The PV Display keeps
indicating the value set in
[Scaling low limit].
Check whether the input signal wire
for DC voltage (0 to 5 V DC, 0 to 10
V DC) and direct current (0 to 20
mA DC) is disconnected.
Check the input signal wires of DC
voltage (0 to 5 V DC, 0 to 10 V DC)
and direct current (0 to 20 mA DC).
How to check whether the input
signal wire is disconnected
[DC voltage (0 to 5 V DC, 0 to 10 V DC)]
If the input to the input terminal of
this controller is 1 V DC, and if a
value (converted value from scaling
high, low limit setting) corresponding
to 1 V DC is indicated, the controller
is likely to be operating normally,
however, the input signal wire may
be disconnected.
[Direct current (0 to 20 mA DC)]
If the input to the input terminal of
this controller is 4 mA DC, and if a
value (converted value from scaling
high, low limit setting) corresponding
to 4 mA DC is indicated, the
controller is likely to be operating
normally, however, the input signal
wire may be disconnected.
Check whether the input terminals
for DC voltage (0 to 5 V DC, 0 to 10
V DC) or direct current (0 to 20 mA
DC) are securely connected to the
instrument input terminals.
Connect the input terminals of DC
voltage and current to the input
terminals of this instrument
securely.
