Yokogawa VJHK User Manual
User’s
/
Manual
IM 77J01H21-01E
Model VJHK
Limit Alarm (DC 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.
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:
● VJHK: 1
● User’s manual (this manual: IM 77J01H21-01E): 1
Accessories:
● Tag number label: 1 sheet
● Range label: 1 sheet
● Shunt resistor
(supplied when current input is specified)
PACKAGE
: 1
4. MODEL AND SUFFIX CODES
VJHK-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:
Within the range of 0 to 50 mA DC, span is 5 mA or more
1:
Within the range of -10 to +10 V DC, span is 0.1 V or more
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
2-M4 or 2-ø4.5 or more
Socket
Unit: mm
Hole for main
unit-fixing screw
Mounting
screws
3. GENERAL
This plug-in type Limit Alarm for DC input receives DC current
or DC voltage signal.
• Each parameter setting can be changed using a PC
(VJ77 PC-based Parameters Setting Tool) or the Handy
Terminal (JHT200 ).
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
59±0.3
Fig.5.1
IM 77J01H21-01E
1st Edition : Feb. 2001
3rd Edition : Aug. 2006 (YK)
2
5.2 DIN Rail Mounting
Locate the VJHK 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
VJHK. 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.
Shunt resistor
(Externally connected
for current input)
Input signal
+
R
–
R : 100
Ω
(Externally
connected
for current input)
1
3
3 2
56
1
4
Alarm-2 output
ALM2(NO)
2
COM
5
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)
ALM1
ALM2
Power supply
L+
10
N–
11
GND
8
All Rights Reserved. Copyright © 1999, Yokogawa M&C Corporation IM 77J01H21-01E 3rd Edition : 2006.08.15-00
1011
Fig. 7.1
789
Alarm-1 output
ALM1(NO)
7
COM
9
Fig. 8.1 Front Panel
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