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2. SYSTEM INSTALLATION
2.1 ENVIRONMENTAL CONSIDERATIONS
The main monitor unit behind the front panel assembly must be located in an environment free of rain,
airborne particles and condensation. The front of the panel may be exposed to a wet and dusty environ-
ment, provided the procedure in locating the housing flange gasket for the front of the monitor is utilized.
2.2 MONITOR INSTALLATION
Refer to figures 3,4 and 5 to identify correct panel cutout to install the monitor housing. Use the supplied
hardware to mount the monitor. Carefully remove the four front bezel screws to expose the chassis
mounting holes. Mount the monitor housing with the mounting flange located on the front side of a se-
cure panel that can accommodate the weight and all necessary wiring. Allocate spare room behind the
monitor to gain access to the terminal strips. Do not allow any debris to fall into the housing. After secur-
ing the housing to its panel, locate the front bezel assembly back into place by first aligning the electrical
connectors and then tighten the four mounting screws.
NOTE: The flange bezel gasket is not supplied, and may be ordered through your distributor by specify-
ing part number 1604-2814. This gasket is utilized if the monitor is subjected to dusty or wet environ-
ments in front of the mounting panel.
2.3 MONITOR FIELD WIRE SUGGESTION
Terminals located at TB2 & TB3 are provided to wire the power, system fault and alarm relay. The use
of stranded wiring is recommended for all relay connections. Do not allow frayed wires to come in con-
tact with its adjoining terminal. Cut approximately .25” insulation from the wire, twist the strands togeth-
er, insert the wire in its respective terminal strip, and then tighten the terminal strip, utilizing the supplied
screwdriver.
2.4 EARTH GROUND CONNECTION
Connect an earth ground wire to TB2-3 on the monitor as indicated in figure 6. Use at least a 14 gage
wire or larger to ensure that there is no more than one ohm total resistance between the monitor chassis
and earth ground. Do not use the mechanical assembly as to substitute for an electrical ground connec-
tion.
2.5 RTD CONNECTIONS
Typically, two-wire RTD’s are utilized in installations but a three-wire may be utilized for higher accuracy.
Two-wire RTD’s are less expensive than three-wire and should be adequate for the average industrial
application. Three-wire RTD’s are supplied with two leads the same color and the third a different color.
Connect the RTD wires to the monitor TB1 as indicated in figure 6.
2.6 SYSTEM FAULT RELAY CONNECTIONS
TB3 terminals on figure 6 provide a customer-accessible dry relay contact. Connect devices to this form
C relay to monitor a system fault. The SPDT fault relay is rated in the specifications section and is nor-
mally energized for failsafe operation. The fault relay is not required in an installation but helps for any
diagnostic problems. Refer to section 10 for fault descriptions.
WARNING - THE EARTH GROUND IS IMPORTANT TO PREVENT A POSSIBLE ELECTRI-
CAL SHOCK HAZARD TO THE USER.
CAUTION - CONNECTING ANY VOLTAGES HIGHER THAN 5VDC TO THE RTD INPUT
TERMINAL TB1, COULD RESULT IN DAMAGING THE MONITOR AND VOIDING THE
WARRANTY.
Summary of Contents for EDISON ONGUARD 1604
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