Flowline LU78 EchoSwitch - Manual (Page 32)

32 of 34 MN300282 Rev A
APPENDIX (continued) Step Eight
Troubleshooting
PROBLEM SOLUTION
TANK does not appear on
the main menu Units function is set for PERCENT on EchoSwitch®: When Units is set
for PERCENT, the TANK function is disabled. To re‐enable TANK,
change units to INCHES, CM, FEET or METERS.
Display always jumps to
the LOST condition Check the dimensional configuration (Height and Fill‐H) of the
EchoSwitch®. Make sure that the Fill‐H setting corresponds to the full
level of liquid (from the bottom up) and not the distance from the
sensor to the liquid (top down).
M‐PLEX does not appear
on the main menu None of the relays are configured the same: M‐PLEX will only appear
when 2 or 3 relays are configured as the same function. For example,
two or more relays are configured as Pumps that Auto Fill. M‐PLEX will
not appear if a relay is configured as an Auto Empty Pump and an Auto
Empty Valve.
Display shows FULL Level of liquid is above the FILL_H setting: Check the FILL_H setting,
making sure the FILL_H setting is high enough so the level of liquid is
below the FILL_H setting
Display shows EMPTY Level of liquid is beyond the HEIGHT setting: Check the HEIGHT setting,
making sure the HEIGHT setting is low enough so the level of liquid is
above the HEIGHT setting
Pumps or Valves do not
alternate 1. M‐PLEX is set for NO‐ALT or A‐TIME is set above 0:
a. If M‐PLEX is set for NO‐ALT, then the relays will not alternate.
Change M‐PLEX to either DUPLEX or TRIPLX to begin alternation.
b. If A‐TIME is set for anything above 0 hours, then the pumps will
only alternate after the A_TIME set has been reached. For
example, if A‐TIME is set for 3 hours, then the relays will only
switch after each 3 hour period. To alternate after each cycle,
change A‐TIME to 0 hours
2. The ON levels for the relays are set to the same setting. Change the
ON set point to another value.
3. The DELAY is set for a period of time that has not been reached.
Example: if delay was set to 600, you must wait 10 minutes before
the relay will trigger.
Relay closes, but does not
open again An inductive kick may be holding the relay closed. If switching 24 VDC,
make sure a diode has been installed to act as a snubber.
Relay chatters on and off
repeatedly Most likely the turbulence in the tank is causing the chatter. Increase
the Hysteresis setting to correct.
Relay does not initially
switch. Check the DELAY setting for the relay. The delay time must be met
before the relay switches. Example: if delay was set to 600, you must
wait 10 minutes before the relay will trigger.