Niagara 6600 Series, Installation, Operation & Maintenance Manual

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Installation, Operation & Maintenance Manual M600 NIAGARA
4.0 ElECTRiCal WiRing
4.1 guidelines
Connect the instruments as per the wiring diagrams given below.
All field wiring must have insulation suitable for at least 240 VAC.
The torque on the terminal clamping screws should be from 4.43# inches to 6.20# inches. Do not overtighten the
screws.
Ensure a circuit breaker with a rating of 6A or a switch, marked as disconnect switch, is in close proximity to the
instrument and within easy reach of the operator. The switch is required to disconnect the instrument from the
mains supply.
The power should be connected through a 3 conductor mains cable suitable and approved for the country where the
instrument is going to be used. The recommended conductor size for power supply and relay output is 14 gage with
at least 250 VAC insulation.
Ensure that the instrument is connected to reliable ground. Use 14 gage conductor with at least 250 VAC insulation.
The recommended cable for 4-20 mA output and pulse output is the Belden 8760, shielded/twisted pair, 18 AWG
(0.75 mm
2
) cable or equivalent.
Relay contact terminals are for use with equipment having no accessible live parts. Maximum allowable working
voltage between adjacent relay contact shall be 230 V.
Relays are shown in De-energized condition. Maximum rating of relay is 2A at 230 V maximum for non-inductive
load.
Fuse is rated as T 1.0A, 250 VAC (slow blow).
Care should be taken to ensure that no moisture or dust enters the housing.