Yokogawa Removable Chassis DX1000N - Manual (Page 57)


IM 04L41B01-02E
Installation and W
iring
Recommended Replacement
Periods for W
orn Parts
Setup Items and
Default V
alues
Optional Terminal Wiring
WARNING
• To prevent electric shock while wiring, ensure that the power supply source is
turned OFF.
• If a voltage of more than 30 VAC or 60 VDC is to be applied to the output
terminals, use ring-tongue crimp-on lugs with insulation sleeves on all terminals
to prevent the wires from slipping out when the screws become loose.
Furthermore, use double-insulated wires (dielectric strength of 2300 VAC or
more) for the signal wires on which a voltage of more than 30 VAC or 60 VDC is
to be applied. For all other wires, use basic insulated wires (dielectric strength of
1390 VAC). To prevent electric shock, attach the terminal cover after wiring and
make sure not to touch the terminals.
CAUTION
• Use the following circuit voltage for the connection to the alarm/FAIL/status
output terminal.
• When the connection is to Mains Circuits (primary AC power source circuits):
150 V or less
• When the connection is to circuits derived from Mains Circuits (secondary
circuits): 250 V or less
(Mains Circuits voltage is less than 300 V, and connection must be used by
isolation transformer.)
• To prevent fire, use signal wires having a temperature rating of 70°C or more.
• If a strong tension is applied to the cable wired to the DX, the terminals of the DX
and/or the cable can be damaged. In order to prevent tension from being applied
directly on the terminals, fasten all wiring cables to the rear of the mounting
panel.
• Do not short the transmitter power supply output terminal or apply external
voltage to it. If you do, the DX may malfunction.
• When using the transmitter power supply output terminal, do not use current
that exceeds the maximum output current (25 mADC). If you do, the DX may
malfunction.
Note
For remote control wiring, use shielded wires to reduce noise. Connect the shield to the
functional ground terminal or the ground terminal of the DX.
Precautions to Be Taken While Wiring
It is recommended that crimp-on lug with insulation sleeves (designed
for 4-mm screws) be used when connecting wires to the optional input
terminals.
Crimp-on lug with insulation sleeves (for 4-mm screws)
Wiring Procedure
As shown in the figure on next page, the optional terminal block is located on the rear
panel. The optional terminal block is provided on the DX when an option that requires
input/output is installed such as the alarm output relay (/A[ ] option), FAIL/status output
relay (/F1 option), and remote control function (/R1 option), etc. A terminal cover is
screwed in place on the measuring input terminal block. A label indicating the terminal
arrangement is affixed to the cover.
1. Turn OFF the DX and remove the terminal cover.
2. Connect the signal wires to the terminals. The recommended torque for tightening
the screws is 0.9 to 1.0 N•m
3. Replace the terminal cover and fasten it with screws. The proper torque for
tightening the screws is 0.6 N•m.
Installation and Wiring