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V. ELECTRICAL INSTALLATION
WARNING: VERY HIGH VOLTAGE IS PRESENT ON THE ROD. REMOVE POWER
FROM THE UNIT BEFORE INSTALLING, REMOVING, OR MAKING ADJUSTMENTS
GENERAL SAFETY
When using electrical equipment, you should always follow basic safety precautions, including the following:
•
The installation and wiring of this product must comply with all national, federal, state, municipal, and
local codes that apply.
•
Do not modify any factory wiring. Connections should only be made to the terminals described in this
section.
CAUTION: ATTEMPTING TO TIGHTEN THE ST-1000 BY ROTATING THE HOUSING OR ROD
MAY DAMAGE THE UNIT AND VOID THE WARRANTY
PROTECTIVE EARTH GROUND
To eliminate shock hazards in the unlikely event of an internal insulation breakdown, the unit is provided with a
"protective earth" (
) lead which must be connected to earth ground. In addition, the input power ground
lead must be connected to the "protective earth" (
it can safely carry the sum total of all circuits' maximum amperage.
ELECTRICAL CONNECTIONS
Note: The LP-500ST model can be operated from 20-255 V AC/DC and provides reverse polarity protection in
the event of a wiring error.
1. Remove the top cover of the housing to access the connection terminals and adjusting switches.
2. Do not remove the wire form terminal pin 1, see Figure 5, because it is an internal connection. For
grounding the unit, use the PE grounding screw terminal PE.
3. After proper installation and the electrical connection, established the device is ready for operation. The
switched-on state is indicated by the lighting of the LED.
The DENSITY (switch A) switch is to be set in accordance with the density of the material:
•
LOW position, recommended for loose and light materials with density below 3.12 lbs/ft
represents small energy and amplitude of vibration as well as great sensitivity of detection.
•
HIGH position, recommended for (thick and heavy) materials with density over 6.24 lbs/ft
represents vibration with great energy and amplitude and small sensitivity of detection
The instrument may not switch correctly in mediums with density less than 3.12 lbs/ft
very small internal friction.
To obtain FAIL SAFE alarm (switch C), use the de-energized or open state of the output as an alarm, thus a
power breakdown will also be considered as alarm, see Figure 6.
The delay (switch B) is to be selected to comply with requirements of the process control technology the
units are used for.
) terminal provided. Wire sizes must be selected such that
7
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(0.05 kg/dm
)
3
3
(0.1 kg/dm
)
3
3
(0.05 kg/dm
) or with
3
3
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