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

IM 77J04H31-01E 3rd Edition : 2006.08.31-00
11. OTHER PARAMETERS
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 MVHK’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” in the MVHK scaling value (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" 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."
Press .
12. MONITOR OUTPUT
12.1 Monitor Output (Analog)
Monitor output (analog) is added only 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 range of the maximum input scaling value
(SH) and minimum input scaling value (SL) that have been set for the MVHK.
For example, when the MVHK range code No. (IN) is “97,” the measured input range (RL,
RH) is “4 to 20 mA DC,” the input scaling values (displayed values) (SL, SH) are “-50 to
150” and monitor output is “1 to 5 V DC,” setting the maximum monitor output value
(RTH) to “125” and the minimum monitor output value (RTL) to “-25” causes monitor
output to be “1 V” when input to the MVHK is 6 mA (scaling value -25) as shown below.
0 mA
1 V
4 mA
(RL) 6 mA 18 mA
20 mA
5 V
20 mA
(RH)
-50
(SL)
-25
(RTL)
150
(SH)
125
(RTH)
Range code No. 97
Measured input range
Input scaling value
Input range of settings for
MVHK range code No. 97
Maximum measured input value:
20.00
mA
Minimum measured input value:
4.00
mA
Maximum input scaling value: 150
Minimum input scaling value: -50
Monitor output setting
Maximum monitor output value: 125
Minimum monitor output value: -25
Monitor output range
Fixed to 4 to 20 mA or 1 to 5 V DC
(5 V is output when the input scaling value is 125,
while 1 V is output when it is -25.)
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
SH
SL
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)
12.1.3 Setting Monitor Output
NOTE
Accuracy ( ± 0.1% of output span) is limited depending on the settings for input scaling
and 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 “125” and minimum monitor output value (RTL) to “-25” when the MVHK input
scaling values (displayed values) (SL, SH) are “-50 to 150.”
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 the set maximum
input scaling value "150."
Press the DOWN key to display "125" on the DATA display.
Press the SET/ENT key to accept this data.
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 the set minimum
input scaling value "-50."
Press the UP key to display "-25" on the DATA display.
Press the SET/ENT key to accept this data.
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
"-25."
Press .
Press to display
"RTH."
Press to display
"125."
Press .
Press .
12.1.4 Adjusting Monitor Output
(1) Instruments for adjustment
• Voltmeter (Yokogawa’s 7562 or equivalent): 1
• Precision resistor of 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 MVHK
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.
The procedure below begins with the condition in which the Setup Parameter Screen
2 is displayed.
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