Yokogawa JUXTA M Series Digital Limit Alarms MVTK - Manual (Page 6)

IM 77J04T31-01E 2nd Edition Feb. 09, 2007-00 6
11.1 Setting Ranges and Factory-Set Values
Setup Parameter Screen 1
0: Without lock. All parameters can be set.
1: Parameters other than the operation
parameters cannot be changed.
2: All parameters cannot be changed.
-1: This moves to the Setup Parameter Screen 2.
Parameter Name Setting Range
Factory-Set
Value
Parameter
Symbol
0
Key lock
(LOC)
Setup Parameter Screen 2
-1999 to 9999
0 (Continuous: no display OFF function),
1 to 60 (minutes)
Parameter Name Setting Range Factory-Set
Value
Parameter
Symbol
0
10
Measured input bias
(BS)
Economical mode
time (ECO)
11.2 Setting Key Lock
This section describes an example of locking keys so that parameter settings other than the
operation parameters cannot be changed. The procedure below begins with the condition in which
the Setup Parameter Screen 1 is displayed.
Press the SET/ENT key to display parameter "LOC."
Press the UP key to display "1" on the DATA display.
Press the SET/ENT key to accept this data.
The decimal point blinks during
data change.
Setup Parameter Screen 1
Press to display
"LOC."
Press to display
"1."
Press .
11.3 Setting Economical Mode Time
Setting economical mode time allows indications on the PV display to be extinguished if no keystroke is
made within the set time.
The MVRK’s power consumption in the OFF mode is approximately 0.5 W or 1 VA during normal
operations (non-alarm status). This section describes an example of setting the economical mode
time to “5 minutes” (factory-set value: 10 minutes).
The procedure below begins with the condition in which the Setup Parameter Screen 2 is displayed.
Press the SET/ENT key to display parameter "ECO."
Press the DOWN key to display "5" on the DATA display.
Press the SET/ENT key to accept this data.
The decimal point blinks during
data change.
Setup Parameter Screen 2
Press to display
"ECO."
Press to display
"5."
Press .
NOTE
The economical mode is temporarily released at the time of PV display color change and
the PV display lights up. After the set economical mode time elapsed from the time of
returning to normal operation, the economical mode operation begins again .
11.4 Setting Input Bias
This section describes an example of correcting an error by setting input bias if there is an error of “-
1 (
° C)” in the MVTK displayed value with respect to the measured value. The procedure below
begins with the condition in which the Setup Parameter Screen 2 is displayed.
Press the SET/ENT key to display parameter "BS."
Press the UP key to display "1.0" on the DATA display.
Press the SET/ENT key to accept this data.
The decimal point blinks during
data change.
Setup Parameter Screen 2
Press to display
"BS."
Press to display
"1.0."
Press .
12. MONITOR OUTPUT
12.1 Monitor Output (Analog)
Monitor output (analog) is addedonly when monitor output code “6” or “A” is specified at the time of
order.
12.1.1 Setting Monitor Output
In setting monitor output, the maximum monitor output value (RTH) and minimum monitor output
value (RTL) can be freely set within the instrument input range of the set range code No. (IN) that
have been set for the MVTK.
For example, to set the monitor output corresponding to the measured input range “-50.0 to 150.0
° C”
to “1 to 5 V DC” when the MVTK range code No. (IN) is “2” (instrument input range: -60.0 to
600.0
° C), set the maximum monitor output value (RTH) to “150.0” and the minimum monitor output
value (RTL) to “-50.0.” This causes monitor output to be “1 V” when input to the MVTK is 50.0 ° C as
shown below.
-60.0 ° C
1V
600.0 ° C
5V
-50.0
(RTL)
150.0
(RTH)
Range code No. 2
Monitor output setting
Maximum monitor output value: 150.0 ° C
Minimum monitor output value: -50.0 ° C
Input range available for the range
code No.2 of the MVTK
Monitor output range
Fixed to 4 to 20 mA or 1 to 5 V DC
(5 V is output when the measured value is150.0 ° C ,
while 1 V is output when it is -50.0 ° C .)
12.1.2 Setting Ranges and Factory-Set Values of Monitor Output (Analog)-Related
Parameters
Setup Parameter Screen 2
RTL + 1 digit to 9999
Within the instrument input range
-1999 to RTH - 1 digit
Within the instrument input range
OFF (invisible) or ON (visible)
Set this parameter to "ON" for adjustments of monitor output.
-25.0 to +125.0 (%)
Note that the assured range is -6.0 to +106 (%).
-19.99 to 20.00 (%)
Parameter Name Setting Range
Factory-Set
Value
Parameter
Symbol
OFF
(invisible)
0.0
0.00
-19.99 to 20.00 (%) 0.00
Maximum monitor
output value (RTH)
Minimum monitor
output value (RTL)
Visibility of monitor output
adjustment screen (MON)
Monitor output zero
adjustment (ZER)
Monitor output span
adjustment (SPN)
Forced output of a monitor
output value (MAN)
Maximum value of
the instrument
input range
Minimum value of
the instrument
input range
12.1.3 Setting Monitor Output
NOTE
Accuracy ( ± 0.1% of output span) is limited depending on the settings for maximum and
minimum monitor output values. For more information on accuracy limitations, refer to
the main specifications on the last page of this manual.
This subsection describes an example of setting the maximum monitor output value (RTH) to “150.0”
and minimum monitor output value (RTL) to “-50.0” when the MVTK range code No. is set to “2.”
When you press the SET/ENT key for more than 3 sec.
with the Operation Parameter Screen displayed, the Setup
Parameter Screen 1 appears.
When the power is turned on, the PV screen of the
Operation Parameter Screen appears.
Press the SET/ENT key to display parameter "RTH."
In this case, the DATA display shows "600.0," the
maximum value of instrument input range of the range
code No. "2."
Press the DOWN key to display "150.0" on the DATA
display.
Press the SET/ENT key to accept this data.
This completes the procedure for setting the maximum
monitor output value.
Press the SET/ENT key to display the next parameter.
Press this key for
more than 3 sec.
The decimal point blinks during
data change.
The decimal point blinks during
data change.
Press the SET/ENT key to display parameter "LOC."
Press the DOWN key to display "-1" on the DATA display.
Press the SET/ENT key to display the Setup Parameter
Screen 2.
Press the SET/ENT key to display parameter "RTL."
In this case, the DATA display shows "-60.0," the minimum
value of instrument input range of the range code No. "2."
Press the UP key to display "-50.0" on the DATA display.
Press the SET/ENT key to accept this data.
This completes the procedure for setting the minimum
monitor output value.
The decimal point blinks during
data change.
Setup Parameter Screen 1
Setup Parameter Screen 2
Operation Parameter Screen
Power ON
This completes the procedure
for setting the maximum
monitor output value.
This completes the procedure
for setting the minimum monitor
output value.
Press to display
"LOC."
Press to display
"-1."
Press .
Press to display
"RTL."
Press to display
"-50.0."
Press .
Press to display
"RTH."
Press to display
"150.0."
Press .
Press .
12.1.4 Adjusting Monitor Output
(1) Instruments for adjustment
• Voltmeter (Yokogawa’s 7562 or equivalent): 1
• Precision resistor 250
Ω ± 0.01%, 1 W: 1
(2) Output adjustments
Connect each instrument as shown below.
8 7 6
7
8 N–
L+
(SUPPLY)
Power supply
R: 250 ⍀ precision resistor for current
output
R Voltmeter
Main unit Socket
–
+
1
1
3
3
Monitor output
(3) Adjusting monitor output
The following describes an example of adjusting an error when the minimum monitor output
value (measured value) is 1.008 V (an error of 0.008 V) with the MVTK monitor output set to “1
to 5 V DC.” The basic adjusting procedure for the maximum monitor output value is the same as
that of the minimum monitor output value; perform it by referring to the procedure below.