MN301535 Rev A
19
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Appendix
Step Eight
TROUBLESHOOTING
PROBLEM
SOLUTION
Relay switches only from input A
(ignores input B)
Latch is turned OFF. Flip the latch switch to turn ON.
Level reaches alarm ON, but relay
is OFF.
First, check to make sure the input LED is ON. If not, check wiring to
sensor.
Second, check status of Relay LED. If incorrect, flip the Invert switch to
change the relay state.
Pump or Valve is supposed to
stop, but it does not.
First, check to make sure the input LEDs are both in the same state
(both ON or both OFF). If not, check wiring to each sensor.
Second, check status of Relay LED. If incorrect, flip the Invert switch to
change the relay state.
Controller is powered, but nothing
happens.
First check the Power LED to make sure it is Green. If not, check the
wiring, power and make sure the terminal is seated correctly.
TESTING RELAYS:
Normally Open (NO) Wiring:
The relay contacts are true dry
contacts with no voltage sourced
within the relay contacts. To test,
connect a Multimeter set to read
Ohms.
Normally Open Wiring
With Invert Off, circuit will be
Open.
With Invert ON, circuit will
read a small resistance.
Normally Closed Wiring
With Invert Off, circuit will be
read a small resistance.
With Invert ON, circuit will be
open.
Normally Closed (NC) Wiring: