Yokogawa JUXTA VJTK - Manual (Page 2)

2
All Rights Reserved. Copyright © 1999, Yokogawa M&C Corporation IM 77J01T21-01E 2nd Edition : 2007.02.09-00
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
Fit into
here
Push
DIN rail
(Rear of the socket)
Slide lock
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 de-
vice.
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 cross-
sectional area of 0.5 mm
2 or thicker, while the power cable
has a nominal cross-sectional area of 1.25 mm 2 or thicker.
Signal
line
Terminal
screw
Recommended crimp-on lug size
(Unit: mm)
5.5 or less
5.5 or more
ø3.2 to 3.5
10 11
3 2 1
4 5 6
7 8 9
GND L+
ALM2 (NO)
COM
ALM1 (NO)
COM
Input signal
RJC sensor
N–
+
–
Power supply
Alarm-2 output
Alarm-1 output
11 10 8
5
2
9
7
3
1
4
RJC
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 in-
put 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 turn-
ing 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; ex-
ercise care in operating it. Before you operate
the product, touch a nearby metal part to dis-
charge 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 oc-
cur. Refer to the following guidelines for a ca-
pacitor and resistor:
Capacitor : 0.5 to 1 µ 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 noise-generating
sources. Otherwise accuracy cannot be guaran-
teed.
● 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.