Mettler Toledo IND131 Installationshandbuch Seite 42

IND131/IND331 Terminals Installation Manual
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 2-28. 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.
DC Powered Units
No power cables are included with 24 VDC powered IND131 and IND331
terminals. The 24 VDC power must be brought directly to the power connection of
the Main board and terminated there. Figure 2-30 shows the three position
terminal block provided for the DC power connection. A wire is not terminated to
the center position.
2-18
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.
The integrity of the power ground for the harsh and J-box versions is
important for both safety and dependable operation of the terminal and its
associated scale base. A poor ground can result in an unsafe condition
should an electrical short develop in the equipment. A good ground
connection also minimizes extraneous electrical noise pulses.
The IND131/331 should not share power lines with noise-generating
equipment. To confirm power conditions, use a commercial branch circuit
analyzer. If adverse power conditions exist, a dedicated power circuit or
power line conditioner might be required.
FOR CONTINUED PROTECTION AGAINST SHOCK HAZARD CONNECT THE AC
VERSION OF THE HARSH AND JUNCTION BOX ENCLOSURES TO PROPERLY
GROUNDED OUTLET ONLY. DO NOT REMOVE THE GROUND PRONG.
WARNING!
WARNING!