Power Connection; Ac Powered Units - Mettler Toledo IND131 Guia De Instalacion

2.4.1.

Power Connection

The IND131 and IND331 terminals are available as either AC powered or DC powered units. The
AC version of the IND131 and IND331 terminals use a 2-position terminal block for connections
while the DC version uses a 3-position terminal block. The 24VDC version also provides a small
triangular warning label indicating it operates from DC voltage.
2.4.1.1.

AC Powered Units

A permanently attached line cord supplies the AC power to the J-Box IND131 and the harsh
enclosure version of the IND331 terminal. The DIN module of the IND131 enclosure and the panel-
mount IND331 do not provide an AC power cord—it is designed to have AC wiring brought directly
to the chassis and connected to the AC power terminal strip. Note that the two AC power
connections are marked "L" for line (hot) and "N" for neutral as shown in Figure 2-30. Note that a
ground wire is not required on the DIN and panel-mount terminals.
No voltage or frequency settings are required since the terminal includes a universal power supply
that operates from 100 to 240 VAC.
64067480 | 11 | 05/2018
Figure 2-31: Harsh Enclosure Connections
ENSURE THAT THE POWER CONNECTION TO THE IND131 OR IND331 TERMINAL MATCHES THE
SPECIFIED OPERATING VOLTAGE OF THAT TERMINAL. REFER TO THE DATA LABEL OF THE
TERMINAL FOR THE OPERATING VOLTAGE. CONNECTING THE INCORRECT POWER SOURCE TO
THE TERMINAL COULD RESULT IN DAMAGE TO OR DESTRUCTION OF THE EQUIPMENT AND/OR
BODILY HARM.
ONLY THE DC POWERED VERSIONS OF THE DIN, PANEL-MOUNT AND J-BOX ENCLOSURES OF
THE IND131xx AND IND331xx TERMINALS HAVE BEEN APPROVED FOR USE IN DIVISION 2
AND ZONE 2/22 ENVIRONMENTS. THE HARSH ENCLOSURE IND331 DC POWERED TERMINAL
AND ALL AC POWERED VERSIONS OF THE IND131 AND IND331 TERMINALS DO NOT HAVE A
DIVISION 2 OR ZONE 2/22 APPROVAL AND MUST NOT BE INSTALLED IN DIVISION 2
ENVIRONMENTS OR IN ZONE 2/22 ENVIRONMENTS.
METTLER TOLEDO IND131/IND131x/IND331/IND331xx Installation Manual
Power
connector
COM1 serial
port
7-position Analog
Load Cell interface
WARNING
WARNING
2-19