User’s
/
Manual
IM 77J01A21-01E
Model VJAK
Limit Alarm (DC Current Input Type)
(with Transmitter Power Supply)
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.
IMPORTANT
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
(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:
● VJAK: 1
● User’s manual (this manual: IM 77J01A21-01E): 1
Accessories:
● Tag number label: 1 sheet
PACKAGE
3. GENERAL
This plug-in type Limit Alarm for DC current input receives 4 to
20 mA DC current signal. It is used in combination with twowire type transmitter.
• 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
VJAK-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
A: 4 to 20 mA DC
(Transmitter power supply: 24 to 28 V DC)
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
2-M4 or 2-ø4.5 or more
Socket
Unit: mm
Hole for main
unit-fixing screw
Mounting
screws
Keep this manual in a safe place.
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
Fig.5.1
IM 77J01A21-01E
1st Edition : Aug. 2006 (YK)
2
5.2 DIN Rail Mounting
Locate the VJAK 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
Fig. 5.2
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
VJAK. 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
cross-sectional 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
When using
internal
power supply
+
–
PS
+
–
COM
When using
external
power supply
1
3
–
+
Power supply
–
COM
L
+
N
GND
56
1011
1
4
789
Alarm-2 output
ALM2 (NO)
2
COM
5
Alarm-1 output
ALM1 (NO)
7
COM
9
3 2
1
3
44
10
–
11
8
IMPORTANT
●
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 F 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 noisegenerating sources. Otherwise accuracy
cannot be guaranteed.
●
The grounding resistance must be 100 Ω (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.
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
ALM1
ALM2
When connecting the transmitter to the VJAK directly without using the transmitter
power supply, connect [+] of the transmitter output to the terminal no. 3 and connect [
to the terminal no. 4.
All Rights Reserved. Copyright © 1999, Yokogawa M&C Corporation IM 77J01A21-01E 1st Edition : 2006.08.15-00
–
]
3
(
)
[
]
e
d
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
PC with th
VJ77 installe
[Comes with VJ77 and JHT200]
Modular jack conversion
adapter (E9786WH)
[Comes with VJ77]
Dedicated adapter (E9789HA)
[Comes with VJ77]
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 Square Root Extraction Function
Select SQR in D11: LINEARIZE to set “with square root extraction function.”
9.1.2 Low-cut Function
Set the low-cut point in D12: LOW CUT numerically when
“with square root extraction function” is set.
● Setting range: 0 to 100% of input range
● Setting resolution: 0.1%
Output signal
(Y)
Y=X
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.
9.2.3 Hysteresis
Set the alarm-1 and alarm-2 hysteresis in E09: HYSTERESIS1 and E10: 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%
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
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.
● Setting range: 0 to 999 seconds
● Setting resolution: 1 second (However, about 0.2 sec-
ond is to be added to the set time to prevent wrong op-
eration.)
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.
0
Hysteresis
(0.2% fixed)
Input signal (X)
Low-cut point
9.2 Settings Related to Alarm Output
9.2.1 Alarm Setpoint
Set the alarm setpoints of alarm 1 and alarm 2 in E03: SET
POINT1 and E04: SET POINT2 numerically.
● Setting range: 0 to 100% of input range
● Setting resolution: 0.1%
IM 77J01A21-01E 1st Edition : 2006.08.15-00
10. DESCRIPTION OF ALARM ACTIONS
This chapter describes examples of alarm actions under the following conditions.
4
Item
Direction of alarm action
Parameter Setpoint Parameter Setpoint
E05 : ALM1 ACTION High-limit alarm E06 : ALM2 ACTION Low-limit alarm
Alarm 1 Alarm 2
Alarm setting E03 : SET POINT1 80% E04 : SET POINT2 15%
Hysteresis E09 : HYSTERESIS1 10% E10 : 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 highlimit 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
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.
Alarm conditions established
Alarm conditions established
Normal conditions established
Normal conditions established
[1]: Alarm status does not continue for more than 1 second after the
High-limit alarm OFF
Alarm-1 OFF delay
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.
Alarm-1 setpoint (80%)
Alarm-1 hysteresis (10%)
Low-limit alarm ON
Alarm conditions
established
Alarm-2 ON delay
Alarm conditions
established
Normal conditions
established
Normal conditions
established
Low-limit alarm OFF
Alarm-2 OFF delay
[%]
100
80
60
High-limit alarm ON
[1] [2]
1 sec
Alarm-1 ON delay
2 sec
40
20
15
Alarm-1 action
Alarm-2 action
Alarm-2 hysteresis (5%)
0
Normal
Alarm-2 setpoint (15%)
Alarm
Normal Alarm
[3]
3 sec 4 sec
Normal
[4]
Elapsed time
1 sec
Normal
All Rights Reserved. Copyright © 1999, Yokogawa M&C Corporation IM 77J01A21-01E 1st Edition : 2006.08.15-00
11. LIST OF PARAMETERS
5
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
D11 Linearize LINEARIZE
D12 Low cut LOW CUT
D38 Direction of output-1 action OUT1 DR (*1)
D60 Self-check result SELF CHK
Adjusting items (*3)
P Adjustment ADJUST1
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:
Press F1
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)
E03 Alarm-1 setting SET POINT1
E04 Alarm-2 setting SET POINT2
E05 Direction of alarm-1 action ALM1 ACTION
E06 Direction of alarm-2 action ALM2 ACTION
E09 Alarm-1 hysteresis HYSTERESIS1
E10 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
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
IMPORTANT
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 77J01A21-01E 1st Edition : 2006.08.15-00
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
● 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 PC-based Parameters Setting Tool (IM
77J01J77-01E) or for JHT200 Handy Terminal (IM JF8102E).
6
Input
With SINK current
+
Calibrator
Without SINK current
Calibrator
1
–
3
+
3
–
4
Power supply
L+
10
N–
11
GND
8
Fig. 12.1
3 2
1
56
4
789
1011
Alarm-2 output
ALM2 (NO)
2
COM
5
Alarm-1 output
ALM1 (NO)
7
COM
9
Calibrator
Calibrator
All Rights Reserved. Copyright © 1999, Yokogawa M&C Corporation IM 77J01A21-01E 1st Edition : 2006.08.15-00
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