FlowLine EchoSwitch LU74 Series, Manual

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| 30 MN300262 Rev B
Appendix (continued)
Step Nine
TOP-LEVEL MENU DESCRIPTIONS (CONTINUED)
o
ALARM – Alarm operation allows for a single set point (Relay ON and OFF at the same level).
Choose between HIGH and LOW operation. Both operations will require a single set point and a
setting for the Hysteresis (HYSTER)

HIGH – used to control a High Level alarm. Relay will energize (ON) when the level is
above the setting and will de-energize (OFF) when the level falls below the setting plus the
added distance from the hysteresis (HYSTER).

LOW – used to control a Low Level alarm. Relay will energize (ON) when the level is below
the setting and will de-energize (OFF) when the level rises above the setting plus the added
distance from the hysteresis (HYSTER).

HYSTER – Used to reduce chatter by creating a hysteresis or differential for the Alarm set point.
The HYSTER value will adjust the OFF position of the Alarm setting by the HYSTER value.

SAFE – Each relay can be individually configured to its own fail-safe setting. Choose between ON, OFF or
HOLD.
o
ON – Energizes the relay when a fail-safe condition occurs
o
OFF – De-energizes the relay when a fail-safe condition occurs
o
HOLD – Keeps the relay in its current state when a fail-safe condition occurs
o
OUTPUT – Sets the 4/20 mA output state when the echo is lost. The options are 4mA, 21mA and
hold last value.

M-PLEX – when two or three relays are configured as pumps, they can be inter–connected to alternate
between each cycle.
o
M-PLEX is only available when 2 or more relays are set for pumps.
o
M-PLEX will not appear when only 1 relay is set for a pump or when the relay functions do not
match (ex: Relay 1 set for a filling pump and Relay 2 set for an emptying pump).
o
Selecting NO-ALT will turn OFF the M-PLEX.

HELP – Provides setup information, the ability to reset the EchoSwitch® and a simulation mode to test the
relay function
o
SETUP – Will display the setting for all functions of EchoSwitch®
o
RESET – Will reset the EchoSwitch® back to its original factory setting
o
SIM-T – Simulation-Test (SIM-T) will allow the end user to simulate changes to level to verify the
relay settings. Using the UP and DOWN buttons will increase
o
TEST P – This is a production test feature used by the factory to confirm operation. This mode
should only be used when supervised by a Flowline representative.