Liquid Controls POD - Manual (Page 10)

Pod WIrInG
POD Wiring
WIrInG conduIt system
When wiring the POD, the wires must enter through the POD’s conduit hub. For explosion proof rated systems (Class
I, Div 1), the wiring must be in explosion proof rated rigid conduit, or, for high vibration installations, explosion proof
rated braided flexible conduit. The conduit must be engaged five (5) full threads into the female hub on the POD to
meet explosion proof requirements.
When installing in a Division 2 location, use either rigid conduit, flexible conduit, or no conduit. When no conduit
is used, the instrument cable must be brought into the POD conduit hub using a cable gland to seal the wiring to
maintain the Enclosure NEMA 4X rating. Regardless of the type of connection used, thread sealant should be applied
to prevent moisture from getting into the POD electrical housing.
! WarnInG
North America - Installations must be in full accordance with the National Electrical Code (US) or the Canadian Electrical
Code respectively to maintain the hazardous location ratings on the product.
Outside of North America - Installations must be in full accordance with EN 60079-14 to maintain the hazardous
location ratings on the product. Use Ex d certified cable glands only. For ambient temperatures above 70ºC, use field
wiring rated 20ºC above the maximum ambient temperature.
observe national and
local codes
WIrInG cable
Multi-wire cable with an overall shield is recommended for POD wiring. If individual wires are used, they must be in
a flexible metal conduit and must not be run with any other cables or wires. Use individual wires between 16 and 20
AWG or shielded cable no less than 22 AWG. Cable runs up to 5000 ft (1524 m) are possible, however cable runs
over 1000 ft (304.8 m) should use lower AWG wire to reduce the IR voltage drop and the inter-wire capacitance. In
addition, long runs may require a lower value pull-up resistor due to the additional cable capacitance that the pulser
must drive. Cable that has a metalized foil plastic shield with a drain wire is recommended over cable with woven
shields because it is easier to terminate the drain wire type cable.
termInal block
Removing the cover of the POD will expose a 4 position terminal block for connection to the user’s electrical system.
The terminal block can be unplugged from the board for ease of wiring. Pull it straight up to remove.
The terminal block screws require a straight blade screwdriver with a tip less than ⅛" wide. Before inserting wires into
the terminal block, strip ¼" of insulation off each wire. Turn each terminal screw counterclockwise a few turns to make
sure that the wiring slot is fully open to accept wire. Insert the stripped end of the wire and tighten the terminal block
screw.
Plug the terminal block back into the board if it was removed. Be sure it is properly oriented with the four pins.
WIrInG confIGuratIons
The wiring configuration used depends on the system needs. Check the input requirements of electronic controls to
determine single channel or quadrature output. The POD can be wired using only one of the two channels (Channel
A or B) if the flowmeter has flow in only one direction. To detect both forward and reverse flow, both channels,
which are in quadrature to each other, must be used. Channel A will lead Channel B by 90º in one flow direction and
Channel B will lead Channel A in the reverse direction. Quadrature is required in most Weights & Measures approved
installations.
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