User’s
/
Manual
IM 77J01T21-01E
Model VJTK
Limit Alarm (Thermocouple Input Type)
1. CAUTIONARY NOTES FOR SAFE
USE OF THE PRODUCT
This user’s manual should be carefully read before installing
and operating the product. The following symbol is used on
the product and in this manual to eusure safe use.
This symbol is displayed on the product when it is
necessary to refer to the user’s manual for information on personnel and instrument safety. This
symbol is displayed in the user’s manual to indicate precautions for avoiding danger to the operator, such as an electric shock.
The following symbols are used only in this manual.
IMPOORTANT
Indicates that operating the hardware or software
in a particular manner may cause damage or result
in a system failure.
NOTE
Draws attention to essential information for understanding the operations and/or functions of the
product.
2.
CHECKING THE PRODUCT SPECIFICATIONS
AND THE CONTENTS OF THE PACKAGE
(1) Model and Specifications Check
Check that the model and specifications indicated on the
nameplate attached to the side face of the main unit are as
ordered.
(2) Contents of the Package
Check that the package contains the following items:
● VJTK: 1
● User’s manual (this manual: IM 77J01T21-01E): 1
Accessories:
● Tag number label: 1 sheet
● Range label: 1 sheet
● RJC sensor: 1
3. GENERAL
This plug-in type Limit Alarm for thermocouple input receives
thermocouple signal.
• Each parameter setting can be changed using a PC
(VJ77 PC-based Parameters Setting Tool) or the Handy
Terminal (JHT200 ).
4. MODEL AND SUFFIX CODES
VJTK-0 2 - 0/T0
Model
Number of outputs
2: 2 outputs
Power supply
6: 100-240 V AC/DC
7: 15-30 V DC
Input signal
1: K (CA) 6: S
2: T (CC) 7: B (RH)
3: E (CRC) 8: N
4: J (IC) 9: W3
5: R A: W5
Output signal
T: Alarm output (2 points of relay contacts)
Optional specification
Blank: With socket
SN: Without socket
(Operating range: 85 to 264 V)
(Operating range: 12 to 36 V)
5. MOUNTING METHODS
5.1 Wall Mounting
Loosen the main unit-fixing screw to disconnect the main
unit from the socket. Next, anchor the socket onto the wall
with screws. Then, plug the main unit into the socket and secure the main unit with the main unit-fixing screw.
Main unit
Main
unit-fixing
screw
<Mounting Dimensions>
29.5 or more
22±0.2
59±0.3
Socket
Unit: mm
2-M4 or 2-ø4.5 or more
Hole for main
unit-fixing screw
Mounting
screws
Keep this manual in a safe place.
IM 77J01T21-01E
Network Solutions Business Divisiion
2-9-32, Naka-cho Musashino-shi, Tokyo 180-8750 Japan
Phone: +81-422-52-7179 Facsimile: +81-422-52-6619
©Copyright Aug. 2006
2nd Edition: Feb. 2007
2
5.2 DIN Rail Mounting
Locate the VJTK so that the DIN rail fits into the upper part
of the DIN-rail groove at the rear of the socket, and fasten
the socket using the slide lock at the lower part of the
socket.
DIN rail
(Rear of the socket)
Push
DIN rail
Slide lock
Fit into
here
DIN
rail
5.3 Using a Duct
Wiring duct should be installed at least 30 mm away from
the top and bottom faces of the main unit.
6. INSTALLATION LOCATIONS
•
Avoid the following environments for installation locations:
Areas with vibrations, corrosive gases, dust, water, oil,
solvents, direct sunlight, radiation, a strong electric field,
and/or a strong magnetic field.
• If there is any risk of a surge being induced into the
power line and/or signal lines due to lightning or other
factors, a dedicated lightning arrester should be used as
protection for both the product and a field-installed device.
7. EXTERNAL WIRING
WARNING
To avoid the risk of an electric shock, turn off the
power supply and use a tester or similar device to
ensure that no power is supplied to a cable to be
connected, before carring out wiring work.
Wiring should be connected to the terminals on the socket of
the VJTK. The terminals for external connections are of M3
screws. Use crimp-on lugs for connections to the terminals.
• It is recommended that signal wires have a nominal crosssectional area of 0.5 mm2 or thicker, while the power cable
has a nominal cross-sectional area of 1.25 mm2 or thicker.
Input signal
RJC sensor
Signal
line
Terminal
screw
Recommended crimp-on lug size
(Unit: mm)
5.5 or less
ø3.2 to 3.5
5.5 or more
Power supply
1110 8
GND
L
+
N–
3 2
1
56
4
789
1011
RJC
Alarm-2 output
2
5
Alarm-1 output
7
9
IMPORTANT
●
Connect the RJC sensor at the correct position
as shown above. Otherwise tempratures cannot
be measured carrectly.
●
Conect the RJC sensor so that it overlaps the input signal line.
●
Handle the RJC sensor lead wire care to prevent
disconnection.
●
Use of the product ignoring the specifications
may cause overheating or damage. Before turning on the power, ensure the following:
(a)Power supply voltage and input signal value
applied to the product should meet the required
specifications.
(b)The external wiring to the terminals and wiring to
ground are as specifications.
●
Do not operate the product in the presence of
flammable or explosive gases or vapors. To do
so is highly dangerous.
●
The product is sensitive to static electricity; exercise care in operating it. Before you operate
the product, touch a nearby metal part to discharge static electricity.
●
If an inductance (L) load such as auxiliary relays
or solenoid valves is used, always insert a spark
killer for diminishing sparks, such as a CR filter
or a diode in parallel with the inductance load.
Otherwise a malfunction or relay failure may occur. Refer to the following guidelines for a capacitor and resistor:
Capacitor : 0.5 to 1 µF with respect to a contact
current of 1 A
Resistor: 0.5 to 1 Ω with respect to a contact
voltage of 1 V
●
The power line and input/output signal lines
should be installed away from noise-generating
sources. Otherwise accuracy cannot be guaranteed.
●
The grounding resistance must be 100 W (JIS
Class D grounding). The length and thickness
of the grounding cable should be as short and
thick as possible. Directly connect the lead
from the ground terminal (terminal no. 8) of the
product to the ground. Do not carry out daisy
chained inter-ground terminal wiring.
+
1
–
3
4
ALM2 (NO)
COM
ALM1 (NO)
COM
All Rights Reserved. Copyright © 1999, Yokogawa M&C Corporation IM 77J01T21-01E 2nd Edition : 2007.02.09-00
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(
)
[
]
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d
8. DESCRIPTION OF FRONT PANEL AND
CONNECTION OF SETTING TOOLS
8.1 Front Panel
The communications connector on the front panel is used for
setting up parameters using a PC (VJ77 PC-based Parameters Setting Tool) or the Handy Terminal (JHT200). The
alarm indicator lamps for alarm 1 and alarm 2 light up if an
alarm occurs.
Communication connector
Alarm indicator lamp
(for alarm 1)
Alarm indicator lamp
(for alarm 2)
Fig. 8.1 Front Panel
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 communication connector of JUXTA.
JUXTA communication cable with
5-pin connector (F9182EE)
JHT200
Handy Terminal
[Comes with VJ77 and JHT200]
ALM1
ALM2
9.1.2 Input Hard Range
Select the input hard range from among AUTO, MIDDLE
and LOW in D17: SELECT RANGE.
● AUTO: Sets the most appropriate input hard range automatically with respect to the input range to be set.
● MIDDLE: For a span of 27.5 mV or more in an input
range of -10 to +100 mV DC converted into
thermoelectromotive force
● LOW: For a span of 10 mV or more in an input range of
-2.5 to +25 mV DC converted into thermoelectromotive
force
NOTE
The conditions for the input hard range (MIDDLE
and LOW) 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 VJTK (GS 77J01T21-01E).
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
Type K (CA)
Type T (CC)
Type E (CRC)
Type J (IC)
Type R
Operation guaranteed range
-200 to 1200°C
-200 to 350°C
-200 to 800°C
0 to 750°C
0 to 1600°C
Input type
Type S
Type B
Type N
Type W3
Type W5
Operation guaranteed range
0 to 1600°C
600 to 1700°C
-200 to 1200°C
0 to 2000°C
0 to 2000°C
Modular jack conversion
adapter (E9786WH)
[Comes with VJ77]
Dedicated adapter (E9789HA)
[Comes with VJ77]
PC with th
VJ77 installe
Dedicated cable
Comes with VJ77
E9786WK
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 thermocouple type to use from among K, T, E, J,
R, S, B, N, W3 and W5 in D08: TC TYPE.
W3: W97Re3-W75Re25 (tungsten 97% rhenium 3%-
tungsten 75% rhenium 25%)
The abbreviation of ASTM E988 Standard.
W5: W95Re5-W74Re26 (tungsten 95% rhenium 5%-
tungsten 74% rhenium 26%)
The abbreviation of ASTM E988 Standard.
Select the temperature unit to use in D15: UNIT.
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 automatically. Apply a stable input as shown below and select EXECUTE 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.
VJ77
VJTK
Short-circuit at the cable end.
or
JHT200
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 action from among HIGH ALM (high-limit alarm) and LOW ALM
(low-limit alarm) in E05: ALM1 ACTION and E06: ALM2 ACTION.
● To activate alarm status when input signal ⱖ alarm
setpoint, select HIGH ALM.
● To activate alarm status when input signal ⱕ alarm
setpoint, select LOW ALM.
IM 77J01T21-01E 2nd Edition Feb. 09, 2007
4
9.2.3 Hysteresis
Set the alarm-1 and alarm-2 hysteresis in E07: HYSTERESIS1 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 activated. The alarm status will be released in the following conditions, 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
9.2.4 Alarm ON Delay and Alarm OFF Delay
Set the alarm-1 and alarm-2 ON delays in E11: ON DELAY1
and E12: ON DELAY2 and then alarm-1 and alarm-2 OFF
● Setting range: 0 to 999 seconds
● Setting resolution:
is to be added to set time to prevent wrong operation.)
For example, when an alarm ON delay is set to 1 second,
alarm output is generated if alarm status continues for 1 second or more after the input value exceeds the alarm
setpoint. Further, when an alarm OFF delay is set to 2 seconds, alarm output is released if normal condition continues
for 2 seconds or more after the input value has returned to
normal from the alarm status.
9.2.5 Direction of Relay Action
Select the direction of relay energizing in alarm-1 normal
condition and alarm-2 normal condition from among NRM
DE-ENERGIZED (de-energized under normal condition) and
NRM ENERGIZED (energized under normal condition) in
E15: RL1 ACTION and E16: RL2 ACTION.
delays in E13: OFF DELAY1 and E14: OFF DELAY2.
An alarm ON delay is the condition monitoring time from the
establishment of alarm conditions to its output; an alarm OFF
delay is the condition monitoring time from the establishment
of return-to-normal conditions to its output.
10. DESCRIPTION OF ALARM ACTIONS
This chapter describes examples of alarm actions under the following conditions.
Item
Direction of alarm action
Parameter Setpoint Parameter Setpoint
E05 : ALM1 ACTION High-limit alarm E06 : ALM2 ACTION Low-limit alarm
Alarm setting E01 : SET POINT1 80% E02 : SET POINT2 15%
Hysteresis E07 : HYSTERESIS1 10% E08 : HYSTERESIS2 5%
Alarm ON delay E11 : ON DELAY1 1 sec E12 : ON DELAY2 3 sec
Alarm OFF delay E13 : OFF DELAY1 2 sec E14 : OFF DELAY2 4 sec
Description of
alarm actions
The alarm is output if the condition where
the input value is 80% or more of high-
limit alarm continues for 1 second or
more.
After the alarm is output, when the
condition where the input value is less
than 70% of high-limit alarm continues for
2 seconds or more, the status returns to
normal.
Alarm conditions established
Alarm conditions established
Normal conditions established
High-limit alarm ON
[%]
100
[1] [2]
Alarm 1 Alarm 2
The alarm is output if the condition where
the input value is 15% or less of low-limit
alarm continues for 3 seconds or more.
After the alarm is output, when the
condition where the input value is more
than 20% of low-limit alarm continues for
4 seconds or more, the status returns to
normal.
Normal conditions established
[1]: Alarm status does not continue for more than 1 second after the
High-limit alarm OFF
alarm conditions are established at alarm 1.
[2]: Normal status does not continue for more than 2 seconds after the
normal conditions are established at alarm 1.
[3]: Alarm status does not continue for more than 3 seconds after the
alarm conditions are established at alarm 2.
[4]: Normal status does not continue for more than 4 seconds after the
normal conditions are established at alarm 2.
1 second (However, about 0.2 second
80
60
40
20
15
Alarm-1 action
Alarm-2 action
1 sec
Alarm-2 hysteresis (5%)
0
Normal
Alarm-1 ON delay
Alarm-2 setpoint (15%)
2 sec
Alarm-1 OFF delay
Alarm
Normal Alarm
Alarm-1 setpoint (80%)
Alarm-1 hysteresis (10%)
Alarm conditions
established
[3]
Alarm conditions
established
3 sec 4 sec
Low-limit alarm ON
Alarm-2 ON delay
Normal conditions
established
Normal
[4]
Alarm-2 OFF delay
Normal conditions
established
Elapsed time
Low-limit alarm OFF
1 sec
Normal
All Rights Reserved. Copyright © 1999, Yokogawa M&C Corporation IM 77J01T21-01E 2nd Edition : 2007.02.09-00
11. LIST OF PARAMETERS
No. Item Display
01 Model MODEL
02 Tag No. TAG NO
03 Self-check result SELF CHK
Display items
A Display 1 DISPLAY1
A01 Input value INPUT1
A05 Output value 1 OUTPUT1 (*1)
A07 Alarm-1 status ALM1 STATUS
A08 Alarm-2 status ALM2 STATUS
A54 Status STATUS (*2)
A56 Rev No. REV NO
A58 Menu Rev MENU REV
A60 Self-check result SELF CHK
Setting items (*3)
D Setting (I/O) SET(I/O)
D01 Tag no.1 TAG NO.1
D02 Tag no.2 TAG NO.2
D03 Comment 1 COMMENT1
D04 Comment 2 COMMENT2
D07 Input sensor type SENSOR TYPE (*1)
D08 Thermocouple type TC TYPE
D15 Unit UNIT
D17 Input hard range selection SELECT RANGE
D22 Input low range INPUT1 L_ RANGE
D23 Input high range INPUT1 H_RANGE
D30 Burnout BURN OUT
D38 Direction of output-1 action OUT1 DR (*1)
D60 Self-check result SELF CHK
Adjusting items (*3)
P Adjustment ADJUST1
P01 Wiring resistance correction WIRING R
P02 Zero adjustment of input 1 ZERO ADJ1
P03 Span adjustment of input 1 SPAN ADJ1
P12 0% adjustment of output 1 OUT1 0% (*1)
P13 100% adjustment of output 1 OUT1 100% (*1)
P60 Self-check result SELF CHK
*1 : The indications and settings of the parameters are not available.
*2 : The status is displayed for service personnel to see history records.
*3 : To call the parameter setting items D, E, P and Q using the JHT200 Handy Terminal, execute the following operation:
F1
Press
D, E, P or Q key enters above.
ENTER
keys
No. Item Display
B Display 2 DISPLAY2
B01 Input value INPUT1
B05 Output value 1 OUTPUT1 (*1)
B07 Alarm-1 status ALM1 STATUS
B08 Alarm-2 status ALM2 STATUS
B60 Self-check result SELF CHK
E Setting (alarm output) SET(ALM)
E01 Alarm-1 setting SET POINT1
E02 Alarm-2 setting SET POINT2
E05 Direction of alarm-1 action ALM1 ACTION
E06 Direction of alarm-2 action ALM2 ACTION
E07 Alarm-1 hysteresis HYSTERESIS1
E08 Alarm-2 hysteresis HYSTERESIS2
E11 Alarm-1 ON delay setting ON DELAY1
E12 Alarm-2 ON delay setting ON DELAY2
E13 Alarm-1 OFF delay setting OFF DELAY1
E14 Alarm-2 OFF delay setting OFF DELAY2
E15 Direction of alarm-1 relay action RL1 ACTION
E16 Direction of alarm-2 relay action RL2 ACTION
E60 Self-check result SELF CHK
Test items (*3)
Q Test TEST
Q01 ON/OFF of RJC RJC
Q02 Forced output 1 OUT1 TEST (*1)
Q04 Forced output (alarm 1) ALM1 TEST
Q05 Forced output (alarm 2) ALM2 TEST
Q60 Self-check result SELF CHK
5
IMPOORTANT
Do not change the settings of the items marked “(*1)” in the List of Parameters above after the delivery of the product. Doing so may result in a malfunction or a system failure.
IM 77J01T21-01E 2nd Edition Feb. 09, 2007
12. MAINTENANCE
The product enters the operable status as soon as the power is turned on, but requires 10 to 15 minutes of warm-up to meet the performance requirements.
12.1 Calibration Apparatus
● Calibrator (Yokogawa Meters & Instruments’ CA71 or equivalent): 1
● Temperature sensor (Yokogawa Meters & Instruments’ B9108WA or equivalent): 1
● Setting tool for adjustment (Refer to “8.2 Connecting the Setting Tools” in this manual.)
12.2 Calibration Procedure
(1) Connect the instruments as shown in Fig.12.1 and Fig. 8.2.
(2) Produce the input signal equivalent to 0% of the input range from the calibrator to the product. Then, read the input value of
Display items, “A01: INPUT1” using the VJ77 or JHT200 and check that the input value is within the rated accuracy range.
Take the same procedure for the input signal equivalent to 25, 50, 75 and 100% of the input range and check that the input values are within the rated accuracy range.
For alarm output, check the relay action by the alarm indicator lamp or resistance of output terminals.
If the input values are out of the rated accuracy range, adjust the input signal level referring to the user’s manual for VJ77 PCbased Parameters Setting Tool (IM 77J01J77-01E) or for JHT200 Handy Terminal (IM JF81-02E).
RJC sensor
Input
+
Calibrator
Temperature
sensor
(B9108WA)
RJC
1
–
3
4
3 2
1
56
4
Alarm-2 output
ALM2 (NO)
2
COM
5
Calibrator
6
Fig. 12.1
Power supply
L+
10
N–
11
GND
8
789
1011
ALM1 (NO)
7
COM
9
Calibrator
Alarm-1 output
All Rights Reserved. Copyright © 1999, Yokogawa M&C Corporation IM 77J01T21-01E 2nd Edition : 2007.02.09-00
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