Chapter 6 Maintenance. Ascon tecnologic RZ10000
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Chapter 6 Maintenance
6.1
Periodic Inspection
Check the operation periodically to keep the recorder in good working order.
Perform the following checks and replace worn parts as needed.
• Is the indication and recording functioning properly? If not, see chapter 5.
• Are recorded lines or printed characters clear (not blurred)?
On the pen model, replace the felt pens and plotter pens. On the dot model, replace the ribbon cassette. For the procedure, see “Preparing to Record” in the Operation
Guide.
• Is the chart paper feeding properly (no paper jams)? If not, see chapter 5.
• Is there enough chart paper remaining?
Remaining chart length is printed on the left margin of the chart at intervals of 20 cm.
For the replacement procedure of the chart paper, see “Preparing to Record” in the
Operation Guide .
6
Remaining amount of chart paper
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6.2
Cleaning the Recorder
CAUTION
• When cleaning, be sure not to scratch the flexible printed circuit board of the plotter carriage.
• Do not apply lubricating oil to the shaft.
Pen Model
To maintain smooth operation, it is recommended that the plotter carriage shaft be cleaned once a year.
Cleaning Procedure
Wipe the dust off the plotter carriage shaft using a soft lint-free cloth or paper.
If the dirt does not come off easily, apply ethyl alcohol to the cloth or paper.
Dot Model
To maintain smooth operation, wipe the dust off the two shafts of the printer carriage using a soft lint-free cloth or paper. It is recommended that these shafts be cleaned once a year.
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6.3
Calibrating the Recorder
Calibrate the measured value against the input.
It is recommended that the recorder be calibrated once a year to assure its measurement accuracy.
For details regarding calibration, contact your nearest YOKOGAWA dealer.
Required Instruments
A calibration instrument with appropriate resolution is required for calibrating the recorder.
Recommended Instrument
• DC voltage standard: Model 5520A by FLUKE or equivalent
Main Specifications
Output accuracy: ±(0.005% + 1 µV)
• Decade resistance box: Yokogawa Meters & Intruments Model 2793-01 or equivalent
Main Specifications
Accuracy of output range 0.1 to 500 Ω: ±(0.01% + 2 mΩ)
Resolution: 0.001 Ω
• 0°C standard temperature device: ZC-114/ZA-10 by Coper Electronics or equivalent
Main Specifications
Standard temperature stability accuracy: ±0.05°C
For information on purchasing the calibration instruments, contact your nearest
YOKOGAWA dealer.
Calibration Procedure
1.
Wire the recorder and the calibration instrument as shown in the following figure, and adequately warm up the instruments (the warm-up time of the recorder is at least 30 minutes).
2.
Check that the operating environment such as ambient temperature and humidity is within the normal operating conditions (see section 7.6).
3.
Apply appropriate input signals corresponding to 0%, 50%, and 100% of the input range and calculate the errors from the readings.
If the error is outside the accuracy specifications, contact your nearest
YOKOGAWA dealer.
Note
For thermocouple inputs, you must measure the temperature of the input terminal and apply a voltage taking into account the reference junction temperature.
DC Voltage Measurement
– +
+
–
DC voltage standard
6
Input terminals
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6.3 Calibrating the Recorder
Temperature Measurement When Using an RTD
The resistance of three lead wires must be equal.
/b
−
/B +/A
Decade resistance box
(Model 2793-01 from
Yokogawa Meters & Instruments)
Input terminals
Temperature Measurement When Using a Thermocouple
Copper wires Thermocouple wires or TC extension wires
−
+
6-4
+
–
DC voltage standard
Copper wires
Thermocouple wires Input terminals
(0
°
C standard temperature device ZC-114/ZA-10 by Coper Electronics)
RJC of TC input
As the measurement terminal of the recorder is generally at room temperature, the actual output of the thermocouple is different from the values given on the thermoelectromotive force table based on 0°C. The recorder performs compensation by measuring the temperature at the input terminal and adding the corresponding thermoelectromotive force to the actual output of the thermocouple. Therefore, when the measurement terminal is shorted (equivalent to the case when the detector tip is 0°C), the measured value indicates the temperature of the input terminal.
When calibrating the recorder, this compensation voltage (thermoelectromotive force of
0°C reference corresponding to the input terminal temperature) must be subtracted from the output of the DC voltage standard before application. As shown in the figure, by using the 0°C standard temperature device to compensate the reference junction at 0 °C, you can input the thermoelectromotive force of 0 °C reference from the DC voltage standard and perform the calibration.
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6.4
Adjusting the Pen Position (Pen Model)
The pen position on the chart paper can be adjusted.
It is recommended that the position be adjusted once a year to assure its recording accuracy.
Note
Pen position is adjusted under standard operating conditions when the recorder is shipped from the factory. Because the chart paper may expand or contract depending on the environment in which the recorder is used, it is recommended that the position be readjusted before use.
Procedure
1.
Warm up the recorder for at least 30 minutes.
2.
Check that the operating environment such as ambient temperature and humidity is within the standard operating conditions (see section 7.6).
3.
Hold down the
MENU
key for 3 seconds to enter Setting mode.
4.
Hold down the and keys simultaneously for 3 seconds to display the
Basic Setting mode screen.
5.
Carry out the procedure shown in the figure below.
Press the or key to select the value.
For the procedure on how to enter values or characters, see page 18 in the
Operation Guide .
To change the polarity, press the or key when the leftmost digit of the value is blinking.
If you press the key, the operation is cancelled, and the display returns to a higher level menu.
6.
Adjust the zero position first and then the full position.
Increase or decrease the setting to align pen position with the scale line on the chart paper.
Select “P_ADJ.”
(P_ADJ)
Select the zero position (ZERO) or full position (FULL).
(ZERO)
Select the pen number.
(PEN1)
Enter the adjustment value.
6
The adjustment value is activated.
(OK)
7.
To repeat the setup, press the
If you are done, press the
key.
key.
8.
To return to the Operation mode,
1. Press the key, use the or key to select
key.
2. Press the or key to select
key.
or
, and press the
, and press the
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6.4 Adjusting the Pen Position (Pen Model)
Explanation
Zero position (
Full position (
to
): Left edge of the chart paper
): Right edge of the chart paper
: Pen number 1 to 4
Adjustment
Zero position: 00 to 70, full position: –45 to 15
A value change of 1 corresponds to 0.033 mm change in the pen position. Decreasing the value moves the pen to the left and increasing the value moves the pen to the right.
Note
The procedure is different when the customized menu is enabled.
• When “P-ADJ” of the customized menu is ON
Carry out steps 1 to 4 in “Adjusting the Pen Position.”
Select “FREE” and press the key to display “P-ADJ.”
Carry out the steps beginning with 5 in “Adjusting the Pen Position.”
• When “P-ADJ” of the customized menu is OFF
See “Releasing the Customized Menu” or “Changing the Settings without Releasing the
Basic Setting Mode Lock.”
<Related Topics>
Releasing the customized menu: Section 4.22
Changing the settings without releasing the basic setting mode lock: Section 4.22
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6.5
Adjusting the Dot Printing Position (Dot Model)
The dot printing position on the chart paper can be adjusted. Adjust the hysteresis, the zero position, and then the full position.
It is recommended that the position be adjusted once a year to assure its recording accuracy.
Note
Dot printing position is adjusted under standard operating conditions when the recorder is shipped from the factory. Because the chart paper may expand or contract depending on the environment in which the recorder is used, it is recommended that the position be readjusted before use.
Procedure
1.
Warm up the recorder for at least 30 minutes.
2.
Check that the operating environment such as ambient temperature and humidity is within the standard operating conditions (see section 7.6).
3.
Hold down the
MENU
key for 3 seconds to enter Setting mode.
4.
Hold down the and keys simultaneously for 3 seconds to display the
Basic Setting mode screen.
5.
Carry out the procedure shown in the figure below.
Press the or key to select the value.
For the procedure on how to enter values or characters, see page 18 in the
Operation Guide
.
To change the polarity, press the or key when the leftmost digit of the value is blinking.
If you press the higher level menu.
6.
Hysteresis:
key, the operation is cancelled, and the display returns to a
Increase or decrease the setting so that the center line on the chart paper becomes a single straight line.
Zero and full positions: Increase or decrease the setting to align the line with the scale line on the chart paper.
Select “P_ADJ.”
(P_ADJ)
Select hysteresis (HYS), zero position
(ZERO), or full position (FULL).
(HYS)
Enter the adjustment value.
6
The adjustment value is activated.
(OK)
7.
If you are done, press the key.
8.
To return to the Operation mode,
1. Press the key, use the or key to select
key.
2. Press the or key to select
key.
or
, and press the
, and press the
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6.5 Adjusting the Dot Printing Position (Dot Model)
Explanation
Hysteresis (
Zero position (
Full position (
): Center of the chart paper
): Left edge of the chart paper
): Right edge of the chart paper
Hysteresis Adjustment
Adjustment: –7 to 7
A line is drawn at the center of the chart paper. If the line appears as shown in Figure a, increase the displayed setting. If the line appears as shown in Figure b, decrease the displayed setting.
Repeat this procedure until the line becomes straight.
A value change of 1 corresponds to 0.1 mm change in the dot printing position.
Up Up
Down Down
Figure a Figure b
Zero Position and Span Adjustment
Adjustment
Zero position: 00 to 15, full position: –45 to 15
A value change of 1 corresponds to 0.1mm change in the dot printing position.
Decreasing the value moves the line to the left and increasing the value moves the line to the right.
Note
The procedure is different when the customized menu is enabled.
• When “P-ADJ” of the customized menu is ON
Carry out steps 1 to 4 in “Adjusting the Dot Printing Position.”
Select “FREE” and press the key to display “P-ADJ.”
Carry out the steps beginning with 5 in “Adjusting the Dot Printing Position.”
• When “P-ADJ” of the customized menu is OFF
See “Releasing the Customized Menu” or “Changing the Settings without Releasing the
Basic Setting Mode Lock.”
<Related Topics>
Releasing the customized menu: Section 4.22
Changing the settings without releasing the basic setting mode lock: Section 4.22
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