Yokogawa JUXTA MU5D - Manual (Page 5)

5 IM 77J04U05-02E 3rd Edition Oct. 15, 2007-00
7. MAINTENANCE
The product starts running immediately when the power is turned on; however, it needs 10 to 15 minutes of warm-up before it meets the specified per-
formance.
7.1 Calibration Apparatus
● A DC voltage/current standard (Yokogawa 7651 or the equivalent)
● A 6-dial variable resistor (Yokogawa M&C 279301 or the equivalent)
● A digital mutimeter (Yokogawa 7561 or the equivalent)
● A precision resistor of 250 Ω ± 0.01%, 1 W
● A setting tool for adjustment
(Refer to “4.2 Connector for Communication” in this manual.)
7.2 Calibration Procedure
(1) Connect the instruments as shown below.
(2) When the input type is thermocouple:
(2-1) Turn off the RJC using the switches on the front panel, or through the setting tool.
(2-2) Use the DC voltage/current standard and apply the electromotive force equivalent to 0, 25, 50, 75, and 100% of the measuring range to the
converter.
(3) When the input type is RTD:
Use the 6-dial variable resistor and apply the resistance equivalent to 0, 25, 50, 75, and 100% of the measuring range to the converter.
(4) When the input type is mV DC:
Use the DC voltage/current standard and apply input signals equivalent to 0, 25, 50, 75, and 100% of the input span to the converter.
(5) Check to see the corresponding output voltages are 0, 25, 50, 75, and 100% respectively and within the specified accuracy rating.
“R
0
” is used for current output.
● Use the setting tool (VJ77 Parameter Setting Tool or JHT200 Handy Terminal) or the switches on the front panel (selection switch and adjustment
switch) to adjust the input/output signals.
For thermocouple input, turn off the RJC.
Input Adjustment Procedure
(1) Input the value equivalent to 0% value of input range.
(2) Call the display item (A: DISPLAY1) to check the input value in A01: INPUT1.
(3) If the adjustment is necessary, call the adjustment item (P: ADJUST).
(4) Select P02: IN1 ZERO ADJ to enter the adjustment mode. Select EXECUTE (adjustment) for adjustment. (If RESET is selected, the adjusted
value is reset to the factory-set default.)
(5) Input the value equivalent to 100% value of input range.
(6) Call the display item (A: DISPLAY1) to check the input value in A01: INPUT1.
(7) If the adjustment is necessary, call the adjustment item (P: ADJUST).
(8) Select P03: IN1 SPAN ADJ to enter the adjustment mode. Select EXECUTE (adjustment) for adjustment. (If RESET is selected, the adjusted
value is reset to the factory-set default.)
Output Adjustment Procedure
(1) When adjusting 0% value of output-1, call the adjustment item (P: ADJUST) to select P26: OUT1ZERO ADJ.
(2) If it slips out to (
+ ) side, set ( − ) value equivalent to slipout; if slips out to ( − ) side, set ( + ) value equivalent to slipout.
*: The 100% value of output-1 and the 0% value and 100% value of output-2 can be adjusted by the same operation as the above.
For adjustment using a setting tool, refer to the User’s Manual for each setting tool and “6. List of Parameters” in this manual.
For adjustment using the switches on the front panel, refer to “4.3 Selection Switch and Adjustment Switch.”
User’s Manual for VJ77 [Document No.: IM 77J01J77-01E]; however, use the VJ77 of version R1.04 or later.
User’s Manual for JHT200 [Document No.: IM JF81-02E]
10 11 1 2
3 9
8 7 6 5
4
9
7
8
1
2
10
11
R
0
Ϫ
ϩ
L ϩ
N Ϫ
GND
Digital
multimeter
R
0
: 250 Ω precision resistor
for current output
R
0
Ϫ
ϩ
Digital
multimeter
R
0
: 250 Ω precision resistor
for current output
Power supply
Output-1
Output-2
5
6 −
+ DC voltge/
current
standard
TC, mV
Input
4
5
6
A
B
B
6-dial
variable
resistor
RTD