Many duplex pump applications require Sequence On – Simultaneous OFF operation with three float switch inputs and alternation of which pump is turned on first. The two loads are energized sequentially when the LEAD & LAG switches close, but remain on together until the OFF switch is opened.
Normally, this is all done with a separate alternating relay, a control relay and two auxiliary contacts. Macromatic Duplex Controllers combine the function of these individual components in one plug-in product utilizing an 8-pin socket. This reduces the cost of the control panel by saving space, reducing the number of components and minimizing assembly labor.
A low profile, three-position switch is provided to alternate the two loads as normal or lock the relay to always operate the same load first each time.
Features
Combines functions of alternating relay, control relay & auxiliary contacts in one unit--saves money
Offers Sequence On - Simultaneous OFF (S.O.S.O.) Operation with three float switch inputs
Protects against failures of both OFF & LEAD switches
Compact plug-in design utilizing industry-standard 8 pin octal socket saves space over separate components
Low profile selector switch for normal alternation or to lock either load to be ON first
macromatic - arp120a8r catalogue page.pdf
