52
(3) Self-diagnosis
The CPU is monitored by a watchdog timer, and when an abnormal status is found
on the CPU, the controller is switched to warm-up status.
(4) Automatic cold junction temperature compensation (Thermocouple input type)
This detects the temperature at the connecting terminal between the thermocouple
and the instrument, and always maintains it at the same status as if the reference
junction location temperature was at 0
(32 ).
(5) Warm-up indication
For approximately 2sec after power-on, the input type and the temperature unit are
indicated on the PV display, and the input range high limit value (for DC input, scaling
high limit value) is indicated on the SV/MV/TIME display.
(6) SV ramp function
When the SV is adjusted, it approaches the new SV by the preset rate-of-chang e.
When the power is turned on, the control starts from the PV and approaches the SV
by the rate-of-change.
For the program control, this function will not work.
12 Specifications
12.1 Standard specifications
Mounting : Flush
Setting : Input system using membrane sheet key
Display
PV display : Red LED, 4 digits, character size, 14.3(H) x 8(W)mm
SV/MV/TIME display : Green LED, 4 digits, character size, 10(H) x 5.5(W)mm
MEMO display (Set value memory number):
Yellow LED, 1 digit, character size, 8(H) x 4(W)mm
Accuracy (Indication, setting)
Thermocouple : Within
0.2% of each input span 1digit
K, J, T input, range less than 0
(32 ):
Within
0.4% of each input span 1digit
R, S input, range 0 to 200
(0 to 400 ): Within 4 (8 )
B input, range 0 to 300
(0 to 600 ): Accuracy is not
guaranteed.
RTD : Within
0.2% of each input span 1digit
DC current : Within
0.2% of each input span 1digit
DC voltage : Within
0.2% of each input span 1digit
Input sampling period : 125ms
(When EA/EV or W/W3 option is added: 500ms)
Input
Thermocouple : K, J, R, S, B, E, T, N, PL-
, C (W/Re5-26)
External resistance, 100
or less
In case of input burnout, Overscale
RTD : Pt100, JPt100, 3-wire system
Allowable input lead wire resistance: 10
or less per wire
In case of input burnout, Overscale
DC current : 0 to 20mA DC, 4 to 20mA DC
Input impedance, 50
Allowable input current, 100mA or less
In case of input disconnection:
0 to 20mA: The same as 0mA
4 to 20mA: Underscale
DC voltage : 0 to 1V DC
Input impedance, 1M
or more
Allowable input voltage, 5V or less
Allowable signal source resistance, 2k
or less
In case of inpu t disconnection, Oversc a le