Flowline LU78 EchoSwitch - Manual (Page 19)

Rev A MN300282 19 of 34
CONFIGURATION (cont.) Step Five
How to Duplex two relays: Duplex enables EchoSwitch® to use two relays to alternate after each cycle while
performing a lead‐lag operation. To begin, configure two relays in the same mode (ex: two relays are set as
PUMPs that FILL or two relays set as PUMPs that EMPTY). Be sure to set one relay with an ON Set Point at the
Primary Level and the other relay ON Set Point at the Backup Level. Setting the relays with the same ON level
will have cause both relays to turn on at the same time. Once this is completed, see the steps below. Example
below shows two relays (A and B) used to Auto Empty a tank:
1. Make sure at least two relays are in the same
mode for pumps.
a. If this is not true, then M‐PLEX will not
appear.
2. In TOP‐LEVEL MENU mode, select M‐PLEX.
3. Select DUPLEX.
a. If three relays are configured in the same
mode, continue to step 4.
b. If only two relays are configured, jump to
step 5.
4. Select R1_R2 (Relay 1 & 2), R2_R3 (Relay 2 & 3)
or R1_R3 (Relay 1 & 3).
a. EchoSwitch® will allow you to select two of
three relays to duplex.
5. Select EXIT to return to TOP‐LEVEL MENU.