![PREPARATION](/images/new-backgrounds/142830/1428307x1.webp)
PREPARATION
Step Four
A. Supply Voltage: The power supply voltage should never exceed the maximum rating of 250 VAC for the LVCN700 series AC switch or 28 VDC for the
LVCN700 series | |||||||
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| HOT |
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| Positive |
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| NEUTRAL |
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| Negative |
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| VAC |
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| VDC |
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| INPUT |
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POWER |
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B. Conduit Entrance: The enclosure has two 1/2” NPT female conduit ports for routing of the switch
supply and relay circuit wiring. Do not | Supply | Relay |
run mixed AC and DC voltages | Port | Port |
through the same conduit port. Route |
| 1/2 NPT |
the supply voltage circuit through one |
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port and the relay circuit(s) through the |
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opposite port.
C. Relay Fail-Safe Design:
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| The switch has (3) relay channels. Each relay is a SPDT | |
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RELAY | open (NO) or normally closed (NC) operation is user | ||
selected based on the desired system control and | |||
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dates for the possibility of relay and/or power failure. The "nor- mal" relay state is where the relay coil is
E. Maximum Applied Range: Individual or cumulative effects of agitation, vapor or foam can reduce the overall quality of signal return and shorten the maximum applied range of the switch. To determine the maximum applied range of the switch in your application, refer to the below derating chart.
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0 | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | ||
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| Ultrasonic Derating Chart |
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| LVCN704/709 |
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| LVCN716/726 |
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Agitation | = | Agitation | = |
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Vapor |
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Foam |
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CALIBRATION
Step Five
A. Introduction: The switch has two modes, the RUN and CAL modes. In the RUN mode, the switch is operational and the relay(s) will energize or
any preset calibration. Each relay channel may be user calibrated into one of the following configurations; 1) high or low level alarm,
2)high and low level out of bounds alarm, 3) automatic fill or empty, or 4) duplexing/Alternating.
High or Low Level Alarm: The high or low level alarm is programmed with a sin- gle set point at the desired tank level. Configured as a high alarm, the relay will energize if the level rises above the set point. Configured as a low level alarm, the relay will energize if the level falls below the set point.
High and Low Level Out of Bounds
Alarm: Programmed with two set points, the high and low level out of bounds alarm protects the top of the tank from overspill and the bottom of the tank from
Automatic Fill or Empty: Programmed with two set points, the latched automatic fill or empty will control a pump or valve. When the level reaches the energize set point, the latching relay will energize, and remain energized until the level reaches the
Duplex/Alternate: Programmed with three set points and two relays, duplexing will automatically fill or empty the tank with two pump alternation for maintenance
and
reaches the energize set point, the relays will alternate. If the level reaches the