- 93 -
SV ramp
function
When the SV is adjusted, it approaches the new SV by the preset
rate-of-change ( /minute, /minute).
When the power is turned on, the control starts from the PV
and approaches the SV by the rate-of-change.
Power failure
countermeasure
The setting data is backed up in the non-volatile IC memory.
Self-diagnosis
The CPU is monitored by a watchdog timer, and if an abnormal
status occurs, the controller is switched to warm-up status, turning
all outputs OFF.
Automatic cold
junction tempera-
ture compensation
(only thermocouple
input type)
Detects the temperature at the connection terminal between the
thermocouple and the instrument, and maintains it at the same status
as if the reference junction location temperature were at 0 (32 ).
Burnout
When thermocouple or RTD input is burnt out, OUT1 and OUT2 are
turned OFF (for direct current output type, OUT1 low limit value),
and the PV Display flashes “
”.
For the manual control, the preset MV is output.
When the DC voltage or current input is disconnected, the PV
Display flashes “
” for 4 to 20 mA DC, 1 to 5 V DC inputs.
For 0 to 10 mV DC, -10 to 10 mV DC, 0 to 50 mV DC, 0 to 100 mV
DC and 0 to 1 V DC inputs, the PV Display flashes “
”.
For 0 to 20 mA DC, 0 to 5 V DC and 0 to 10 V DC inputs, the PV
display indicates the value corresponding with 0 mA or 0 V input.
Input error indication
Contents,
Indication
Output status
OUT1
OUT2
Direct(Cooling) Reverse(Heating) Direct(Cooling) Reverse(Heating)
Overscale
Measured value
has exceeded
Indication range
high limit value.
"
" flashes.
OFF (4 mA) or
OUT1 low
limit value
OFF (4 mA) or
OUT1 low limit
value
OFF or
OUT2 low
limit value
OFF or
OUT2 low
limit value
Underscale
Measured value
has dropped
below Indication
range low limit
value.
"
" flashes.
OFF (4 mA) or
OUT1 low
limit value
OFF (4 mA) or
OUT1 low limit
value
OFF or
OUT2 low
limit value
OFF or
OUT2 low
limit value
For manual control, the preset MV is output.
Indication range,
Control range
Thermocouple [Input range low limit value - 50 (100 )] to
[Input range high limit value + 50 (100 )]
RTD
[Input range low limit value - Input span x 1%] to
[Input range high limit value + 50 (100 )]
DC voltage,
Direct current
[Scaling low limit value - Scaling span x 1%] to
[Scaling high limit value + Scaling span x 10%]
Warm-up
indication
After the power supply to the instrument is turned on, the PV
Display indicates the sensor input type, and SV/MV/TIME Display
indicates input range high limit value (for thermocouple, RTD inputs)
or Scaling high limit value (for DC voltage, current inputs) for
approximately 3 seconds.
Содержание ACD-13A
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