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FloBoss 407 Instruction Manual
2-14
Rev 5/00
2.4 CONNECTING THE FLOBOSS 407 TO WIRING
The following paragraphs describe how to connect the FloBoss 407 to power, ground, I/O devices, and
communications devices. Use the recommendations and procedures described in the following
paragraphs to avoid damage to equipment or injury to personnel.
The FloBoss 407 terminal blocks
can accommodate up to 12 AWG wire.
CAUTION
Always turn the power to the FloBoss off before you attempt any type of wiring.
2.4.1 Connecting Groun d Wiring
Equipment Required:
Small flat-blade screwdriver
The FloBoss 407 and related components must be connected to earth ground. The National Electrical
Code (NEC) governs the ground wiring requirements for all line-powered devices.
The FloBoss 407 has a ground bus bar located in the lower section of the enclosure. The ground bus
bar is electrically bonded to the enclosure and provides space to connect ground wires from I/O devices,
power input, and grounding conductors from devices used in the installation. For line-powered devices,
the grounding conductor must end at the service disconnect. The grounding conductor can be wire or
metallic conduit as long as the circuit provides a low impedance ground path.
With stand-alone units, a grounding terminal on the outside of the housing allows you to ground the
FloBoss 407 directly to an earth ground.
It is recommended that 12 AWG wire be used for the
ground wiring.
Make sure the installation has only one ground point to prevent creation of a ground
loop circuit. A ground loop circuit could cause erratic operation of the system.
2.4.2 Connecting Main P ower Wiring
Equipment Required:
Small flat-blade screwdriver
It is important that good wiring practice be used when sizing, routing, and connecting power wiring.
All wiring must conform to state, local, and NEC codes. The terminal blocks can accommodate up to
12 AWG wire.
Use 18 AWG wire or larger for all power wiring.
Connect power to the FloBoss 407 through the plug-in PWR terminal block on the termination board.
Connect the DC power source to the “+” and “-” terminals.
Make sure the polarity is correct.
Figure
2-4
shows the location of the power indicator and the power wiring terminal block.
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