5.0 Operation
© 2020 Sensata Technologies
56
• StackClock
Fault
– There is a stacker cable problem; or, one inverter
is losing synchronization with the other inverter.
Remedy:
Ensure you are using a Magnum Stacking Cable (this is
not a telephone/data cable, this is a custom made cable). Inspect
the stacker cable and reconnect at both ends (listen and make sure
you hear an audible “click” from the connectors at both inverters).
Info:
This fault has been known to occur when a Magnum Energy
accessory is plugged into the inverter’s Stack port, but the
installation is not using multiple inverters in a stacked con
fi
guration.
If this occurs, perform an inverter reset (see Section 6.2).
• Stack
Mode
Fault
–
This unit has detected a problem with the “other”
stacked inverter. Check that unit for a fault condition.
Remedy:
This fault will automatically clear when the fault with the
other inverter is corrected.
• StackPhase
Fault
–
1. The AC input wiring is incorrect; 2. One phase
was lost from the AC input source; 3. One of the inverter’s internal transfer
relays is bad; or, 4. The inverter’s AC input circuit breaker may be open.
Remedy:
If this fault doesn’t clear after checking these four
recommendations, perform an inverter reset (see Section 6.2).
• Tfmr
Overtemp
– This fault message is displayed when the TCO
(Temperature Cut-Out) opens and causes the inverter to shut down to
protect the internal power transformer from damage. When the TCO has
cooled down, the inverter will automatically restart and resume operation.
Remedy:
If the fault continues to occur, disconnect all the inverter’s
AC output wires and reset the inverter (see Section 6.2). If this fault
does not clear after doing a reset, the inverter may require service.
• Unknown
Fault
##
– This fault message displays when the inverter/
charger has sent a fault code that cannot be determined by the remote.
Remedy:
Contact the Magnum Technical Support team to assist you.
• Stuck
Relay
– This fault message displays when the inverter is
“inverting”, but the internal AC pass-thru relay that should be open while
inverting, is closed.
Remedy:
The AC pass-thru relay is most likely stuck. A relay usually
sticks because of damage to the contacts from trying to handle
currents greater than they are rated. This is usually caused by not
protecting the relay or by switching high current inductive loads. The
internal relay contacts are rated to handle 30 amps AC continuously
and should be protected with an input breaker sized no larger than
30 amps. If you are connected to an AC source (grid or generator)
and running large inductive loads (i.e., pumps, motors, etc.,) on
the inverter output, turn those particular loads off prior to removing
the AC input source. This fault requires an inverter or power reset
(Sections 6.2 and 6.3) to clear.
