Hach Polymetron 9500 User Manual

Also see for Polymetron 9500: Basic user manual

Hach Polymetron 9500 User Manual Manual pdf 17 page image

powered controller and 24 VDC, 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 the instrument 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 relaysmust have current limiting devices provided to limit current to < 5 A.W A R N I N GPotential fire hazard. Do not daisy-chain the common relay connections or jumper wire from the mains powerconnection inside the instrument.W A R N I N GPotential electrocution hazard. In order to maintain the NEMA/IP environmental ratings of the enclosure, use onlyconduit fittings and cable glands rated for at least NEMA 4X/IP66 to route cables in to the instrument.AC line (100—250 V) powered controllersW A R N I N GPotential electrocution hazard. AC mains powered controllers (115 V–230 V) are designed for relay connectionsto AC mains circuits (i.e. voltages greater than 16 V-RMS, 22.6 V-PEAK or 35 VDC).The wiring compartment is not designed for voltage connections in excess of 250 VAC.24 VDC powered controllersW A R N I N GPotential electrocution hazard. 24 V powered controllers are designed for relay connections to low voltage circuits(i.e. voltages less than 16 V-RMS, 22.6 V-PEAK or 35 VDC).The 24 VDC controller relays are designed for connection to LOW voltage circuits (i.e., voltages lessthan 30 V-RMS, 42.2 V-PEAK or 60 VDC). The wiring compartment is not designed for voltageconnections above these levels.The relay connector accepts 18-12 AWG wire (as determined by load application). Wire gauge lessthan 18 AWG is not recommended.The Normally Open (NO) and Common (COM) relay contacts will be connected when an alarm orother condition is active. The Normally Closed (NC) and Common relay contacts will be connectedwhen an alarm or other condition is inactive (unless the Fail Safe is set to Yes) or when power isremoved from the controller.Most relay connections use either the NO and COM terminals or the NC and COM terminals. Thenumbered installation steps show connection to the NO and COM terminals.English 15