Hach sc200 User Manual

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Hach sc200 User Manual Manual pdf 15 page image

Table 1 AC power wiring information (AC powered models only)Terminal number TerminaldescriptionWire color codefor NorthAmericaWire color codefor Europe1 Hot (L1) Black Brown2 Neutral (N) White Blue— Protective Earth(PE) Ground lugGreen Green w/yellowstripeTable 2 DC power wiring information (DC powered models only)Terminal number TerminaldescriptionWire color codefor NorthAmericaWire color codefor Europe1 +24 V dc Red Red2 24 V dc return Black BlackAlarms and relaysThe controller is equipped with four unpowered, single pole relays rated100-250 VAC, 50/60 Hz, 5 amp resistive maximum. Contacts are rated250 VAC, 5 amp resistive maximum for the AC powered controller and 24VDC, 5A resistive maximum for the DC powered controller. The relays arenot rated for inductive loads.Wiring relaysW A R N I N GPotential Electrocution Hazard. Always disconnect power to theinstrument when making electrical connections.W A R N I N GPotential fire hazard. The relay contacts are rated 5A and are not fused.External loads connected to the relays must have current limitingdevices provided to limit current to < 5 A.W A R N I N GPotential fire hazard. Do not daisy-chain the common relay connectionsor jumper wire from the mains power connection inside the instrument.W A R N I N GPotential electrocution hazard. In order to maintain the NEMA/IPenvironmental ratings of the enclosure, use only conduit fittings andcable glands rated for at least NEMA 4X/IP66 to route cables in to theinstrument.AC line (100—250 V) powered controllersThe wiring compartment is not designed for voltage connections in excessof 250 VAC.24 VDC powered controllersThe 24 VDC controller relays are designed for connection to LOW voltagecircuits (i.e., voltages less than 30 V-RMS, 42.2 V-PEAK or 60 VDC. Thewiring compartment is not designed for voltage connections above theselevels.The relay connector accepts 18-12 AWG wire (as determined by loadapplication). Wire gauge less than 18 AWG is not recommended.The Normally Open (NO) and Common (COM) relay contacts will beconnected when an alarm or other condition is active. The Normally Closed(NC) and Common relay contacts will be connected when an alarm orother condition is inactive (unless the Fail Safe is set to Yes) or when poweris removed from the controller.Most relay connections use either the NO and COM terminals or the NCand COM terminals. The numbered installation steps show connection tothe NO and COM terminals.English 13