Instruction manual

57
Problem Presumed cause and solution
The setting indication
does not change in the
input range even if the
, keys are
pressed, and new
values are unable to
be set.
• SV high limit or low limit in Auxiliary function setting mode 1
may be set at the point where the value does not change.
Set it to a suitable value ( , or ) while in
Auxiliary function setting mode 1. (p.31)
<Control>
Problem Presumed cause and solution
If process variable
(temperature) does
not rise.
• Thermocouple or RTD is burnt out.
• Lead wire of thermocouple or RTD is not securely
connected to the instrument terminals.
• Direct (Cooling) action [ ] has been selected during
the Direct/Reverse action selection [ ] in “5. Setup”.
Select Reverse (Heating) [ ] action. (p.20)
If the control output
(OUT) remains in an
ON status.
• OUT low limit value is set to 100% or higher in Auxiliary
function setting mode 2. (p.17)
• The proportional band may be set at an extremely small
value.
Set it to a suitable value. (p.28)
If the control output
(OUT) remains in an
OFF status.
• OUT high limit value is set to 0% or less in Auxiliary function
setting mode 2. (p.17)
• The proportional band may be set at an extremely high
value.
Set it to a suitable value. (p.28)
Step numbers progress
fast and program
control stops soon after
it has started.
• The program has not been set.
Set the program from the Pattern (Step SV/Time) setting
mode. (pages 25, 26)
• The default value is PV start.
If the PV is higher than the Step SV, the program advances
and it ends soon. (p.17)
The step does not
proceed.
• Wait function is working.
Release the wait function.
• The fixed value control is performing due to Hold function.
Press the RUN Key for more than 1 second to release
the Hold function. (p.39)
For all other malfunctions, please contact our main office or dealers.