Acromet WG-602 Manual
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Contents
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38Connecting to External Monitoring System1) Connect two wires from the active output to the appropriate connection on the external system2) Repeat for each active output3) If an active output (output with a chipset installed) is not to be used, place a jumper wire between thecontacts.6 Appendix A: Relays and Closed-Loop ControlThere are 6 dry-contact relays on the I/O module. Five of the relays may be used for direct control ofclosed loop systems. All of the relays may be used as dry-contacts, and will operate based on thesettings, specifically the set-points, selected in the operator menu.6.1 Connecting external equipment to the RelaysThis is only required if the relays are being used to power and control external dosing equipment. Therelays will act as dry contacts if no power is supplied. A dependent power supply should be used suchthat no equipment will be activated unless the process line has flow.6.1.1 Wiring to Dosing SystemsWaterGuard controls chemical dosing systems using a series of electronic relays that start and stop thedosing pumps. Each relay opens and closes a switch that activates a separate pump or piece ofequipment.The line (live) wire of the dependent power source connects to the connection labeled Common on eachrelay. The line wire of each controlled system is connected to the normally open (NO) or normally closed(NC) connection of each relay as appropriate. Normally Open means that the relay will be open (i.e. nopower from the relay) until the controller calls for power; Normally Closed means that the relay will beclosed (i.e. power from the relay) until the controller calls to stop power.1) Verify that the power switch or circuit breaker to the dependent power source is off.2) Connect the earth wire to the ground return wire from each of the external dosing systems.3) Connect the neutral wire to the return wire from each of the external dosing systems.4) Connect the line (live) wire to the connector marked Common of each active relay.Caution: Each relay connection is limited to 4 amps, to prevent overheating. The relays may show ahigher rating but do not connect equipment exceeding 4 amps.The following table lists the relays and the dosing systems they control: |
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