Yokogawa VJAK User Manual

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.

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

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)

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

–

COM

When using external power supply

–

Power supply

–

COM

GND

1011

789

Alarm-2 output

ALM2 (NO)

COM

Alarm-1 output

ALM1 (NO)

COM

3 2

–

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.

–

]

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