Flowline LU78 EchoSwitch - Manual (Page 20)

20 of 34 MN300282 Rev A
CONFIGURATION (cont.) Step Five
How to Alternate two relays: Alternate enables EchoSwitch® to use two relays to alternate after each cycle.
The configuration of Alternate is identical to Duplex with the exception of the Backup level is at a setting
where the level will never achieve set point. 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. The Backup level must be set to a level
out of range (level will never reach this setting). 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.