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Phenomenon
Autotuning not
available
"
" Set point not
raised (for the type
fitted with heater
break alarming)
Loop break detection
not available
Digital transmission
not properly performed
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Possible cause
• Input error
• Ramp/soak command set to other
than "
"
• Manual run being performed
• Set point changed during
autotuning
• Because of the too slow process,
autotuning is not terminated within
12 hours.
• The control output relay has been
switched on not long enough.
• Output proportion cycle time too
short
• Output limit setting is illegal
• Host-side setting is wrong.
• Station number is wrong.
• Polarity of transmission
connection is wrong.
• Check the input or sensor connec-
tion. (See page 19~29.)
• Check the input switch pin correctly.
(See page 40.)
• Set the ramp/soak command to
"
" during autotuning. (See
page 60~63.)
• Switch the manual run mode to the
automatic run mode. (See page 69.)
• Do not change the Set point value
during autotuning.
• Autotuning is not available. Perform
manual tuning. (See page 51~54.)
• If the control output relay does not
get triggered at least 1 sec after
powering on, the correct heater
current value cannot be detected.
(See page 58.)
• Set the output proportion cycle time
of "
(See page 79.)
• Loop break detection is not
available when "
than 100.0 or "
than 0.0. (See page 77.)
• Give the right transmission setting
to the host. (See page 67~68.)
• Set the right station number. (See
page 67~68.)
• Check if the transmission
connection are all right. (See pages
19~29.)
90
User response
" to 20 sec or more.
" is smaller
" is larger
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