MEMOLUB® User's Guide - PLI, LLC

attery power and under control of the MEMO program. Upon initial closure of the relay,the MEMOLUB ® goes through an immediate output cycle and then reverts control to thepreset MEMO program.The relay may also be controlled by a PLC, permitting ejection cycles to occur basedupon cumulative hours of machine runtime, clock hours, or some other event determinedby the PLC. For an output cycle to occur, the PLC must close the relay for at least 15seconds, and there must be a 60-second interval between output cycles. The MEMOprogram is not used when operating under PLC control; however a white timing ringshould be in place.When operating under External Power Control (EPC) the life of the lubricant cartridgecannot be determined by the setting of the MEMO program. It will therefore be necessaryto estimate cartridge change-out based on the MEMO setting and normal machine runtimehours or, if used with a PLC, other criteria being used to control ejection cycles.When the MEMOLUB ® EPC is operating under PLC control, the PLC can calculate thecartridge change-out by counting the number of output cycles ordered, and consideringthe programmed output volume and lubricant cartridge size.Relay contacts must be gold-plated, and the type of relay used will be dictated by theapplication. Furthermore, the distance between the MEMOLUB ® EPC and the relay willdetermine the extension-wire gage and the connector sizes. Refer to the price sheets orcontact PLI, LLC for pricing and availability of relays, cables, and connectors.4.2 The MEMOLUB ® 4.5VDC, 12VDC & 24VDC EPS VersionThe EPS (External Power Supply) version of the MEMOLUB ® HPS operates from anexternal power source, either 4.5VDC, 12VDC or 24VDC, bypassing the unit’s batterychamber. A lead-wire extends from the bottom of the lubricator, and must be connectedto an external power source in order to operate. Extension cables and connectors areprovided by PLI, LLC to facilitate this connection.External Power may be supplied continuously from a transformer, in which case theMEMOLUB ® EPS will operate under program control of the MEMO. Functioning willbe identical to that of the standard MEMOLUB ® HPS.Regulated power may also be supplied by a PLC. In this case the program of the PLC maybe used to control the ejection cycles by periodically providing power to theMEMOLUB ® EPS. The frequency of lubricant ejection cycles can thus be controlled bycumulative hours of machine runtime or clock hours, or some other event determined bythe PLC. The duration of the power pulse supplied by the PLC should be approximately 6seconds. While the MEMO does not control the operation of the unit in this mode ofoperation, it must still be in place with the white timing ring installed.When operating under External Power Supply (EPS) the life of the lubricant cartridgecannot be determined by the setting of the MEMO program. The frequency of cartridgechange-out is dictated by the PLC criteria (which controls the ejection cycles) and thevolume setting of the MEMO. The PLC calculates the cartridge change-out by countingMEMOLUB ® HPS User’s Guide Page 10 of 39 PLI, LLC