Yokogawa JUXTA VJRK - Manual (Page 3)

3
IM 77J01R21-01E 1st Edition : 2006.08.15-00
8.2 Connecting the Setting Tools
Connect the modular jack conversion adapter (E9786WH) to
the JUXTA communication cable with 5-pin connector
(F9182EE) and then connect this adapter to the communica-
tion connector of JUXTA.
JHT200
Handy Terminal
JUXTA communication cable with
5-pin connector (F9182EE)
[Comes with VJ77 and JHT200]
Modular jack conversion
adapter (E9786WH)
[Comes with VJ77]
Dedicated adapter (E9789HA)
[Comes with VJ77]
Dedicated cable (E9786WK)
[Comes with VJ77]
PC with the
VJ77 installed
Fig. 8.2 Connecting the Setting Tools
Note: The modular jack conversion adapter does not
come with the JHT200 Handy Terminal.
It is sold separately.
9. SETTING PARAMETERS
Set the parameters using a PC (VJ77 PC-based Parameters
Setting Tool) or the Handy Terminal (JHT200). Refer to the list
of parameters in this manual and the user’s manual for VJ77
PC-based Parameters Setting Tool (IM 77J01J77-01E) or
JHT200 Handy Terminal (IM JF81-02E).
9.1 Settings Related to Input
9.1.1 Input Type and Temperature Unit
Select the RTD type to use from among Pt100-90, Pt100-68,
JPt100 and Pt50 in D09: RTD TYPE.
● Pt100-90: ITS-90 (R
0
=100 Ω , R
100
/R
0
=1.3851)
● Pt100-68: IPTS-68 (R
0
=100 Ω , R
100
/R
0
=1.3850)
● JPt100: JIS’89 (R
0
=100 Ω , R
100
/R
0
=1.3916)
● Pt50: JIS’81
Select the temperature unit to use in D15: UNIT.
9.1.2 Input Hard Range
Select the input hard range from among AUTO, HIGH and
MIDDLE in D17: SELECT RANGE.
● AUTO: Sets the most appropriate input hard range auto-
matically with respect to the input range to be set.
● HIGH: For a span of 130 Ω or more in an input range of
0 to 520 Ω based on the reference resistane table
● MIDDLE: For a span of 38.5 Ω or more in an input range
of 0 to 176 Ω based on the reference resistane table
NOTE
The conditions for the input hard range (HIGH and
MIDDLE) are specified for operations within the
range of accuracy rating. The input range may be
set to a range not meeting these conditions, but
take note of accuracy limitations. Similar accuracy
limitations exist even when AUTO is selected. For
more information on acuracy limitations, see the
general specifications of VJRK (GS 77J01R21-01E).
9.1.3 Input Range
Set the 0% value of input range in D22: INPUT1 L_RANGE
and the 100% value of input range in D23: INPUT1
H_RANGE numerically within the specified range.
Input type
Operation guaranteed
range ( ° C)
Pt100 (ITS-90)
–200 to 660
Pt100 (IPTS-68)
–200 to 660
JPt100 (JIS'89)
–200 to 510
Pt50 (JIS'81)
–200 to 649
9.1.4 Burnout
Select the direction of burnout action from among UP,
DOWN and OFF in D30: BURN OUT.
9.1.5 Wiring Resistance Correction
When an error occurs due to the influence of the input wiring
resistance, the wiring resistance can be corrected automati-
cally. Apply a stable input as shown below and select EX-
ECUTE in P01: WIRING R. The correction is also required
when the direction of burnout action is changed from UP
(DOWN) to DOWN (UP) or the wiring for input is changed.
VJRK
VJ77
or
JHT200
Short-circuit at the cable end.
9.2 Settings Related to Alarm Output
9.2.1 Alarm Setpoint
Set the alarm setpoints of alarm 1 and alarm 2 in E01: SET
POINT1 and E02: SET POINT2 numerically.
● Setting range: 0 to 100% of input range
● Setting resolution: 0.1 ° C
9.2.2 Direction of Alarm Action
Select the direction of alarm-1 action and that of alarm-2 ac-
tion from among HIGH ALM (high-limit alarm) and LOW ALM
(low-limit alarm) in E05: ALM1 ACTION and E06: ALM2 AC-
TION.
● To activate alarm status when input signal Ն alarm
setpoint, select HIGH ALM.
● To activate alarm status when input signal Յ alarm
setpoint, select LOW ALM.
9.2.3 Hysteresis
Set the alarm-1 and alarm-2 hysteresis in E07: HYSTER-
ESIS1 and E08: HYSTERESIS2. Hysteresis is a value
added to the alarm setpoint in order for an alarm status to be
released (to normal) after the alarm status has been acti-
vated. The alarm status will be released in the following con-
ditions, depending on the direction of alarm action.
*
When HIGH ALM (high-limit alarm) is set: Alarm is re-
leased when input signal < (alarm setpoint - hysteresis).
* When LOW ALM (low-limit alarm) is set: Alarm is re-
leased when input signal > (alarm setpoint + hysteresis).
● Setting range: 0 to 100% of input range
● Setting resolution: 0.1 ° C