13-9-653 Page 25
Message Action needed
LV RELAY 120 volts has been removed from terminal 7 of the terminal strip. This is
normally shipped jumpered directly to terminal 9, but the jumper may be
removed to add a field installed shutdown switch. Reset the external
switch.
MAIN OVERLOAD The overload relay for the main compressor drive motor, located within
the electrical control box, has tripped. This indicates high motor shaft
load, low voltage, or excessive imbalance in the incoming power (such
as a blown fuse). Disconnect and lock out power, open the box, and
press the reset button - it will click when reset. Measure motor amps,
and take corrective actions to get all currents within the motor nameplate
rating. Check that the programmed Set Pressure is at or below the
compressor nameplate rating. If the overload relay has not tripped,
check for the cause that 120 volts was removed from connector 8 -2 of
the controller.
MAIN STARTER The controller has attempted to start the compressor, but did not receive
a return signal from the starter's auxiliary contact. If the starter does not
pick up when attempting to start, check that connector 9 of the controller
is plugged in firmly, and check the starter coil. If the starter does pick up,
but this message appears, check that the auxiliary contact block is
properly installed on the starter and wired to connector 8, terminal 4.
MAIN STRT CONTCT The controller has attempted to turn off the compressor, but is still
receiving a return signal from the starter's auxiliary contact. Check that
the starter operates freely and that the contact block is properly installed
on the starter.
MOTOR OVERTEMP 120 volts has been removed from terminal 7 of the terminal strip. This is
normally shipped jumpered directly to terminal 9, but the jumper may be
removed to add a field installed shutdown switch. Reset the external
switch.
OPEN AMP SENSOR The controller is not sensing current to the main motor when it is turned
on. Check that the main starter is operating properly. Check for a loose
or broken connection at connector 4. Check wiring and proper
installation of the current transformer and current transducer.
OPEN THERM The controller has detected an open connection to thermistor: (A) airend
discharge or (B) separator. This normally indicates a loose or broken
connection at the controller connector 7; check and correct the
connection. This could also be indicating a broken wire or thermistor
probe, or exposure to excessively low temperatures.
OPEN XDUCER Signal voltage has fallen too low at transducer: (A) final discharge or (B)
reservoir. This probably indicates a loose connection of the red or green
wire to the transducer or an unplugged transducer. It connections are
good, this is indicating a defective transducer. Check connections, or
replace transducer if necessary.
PHASE RELAY 120 volts has been removed from terminal 7 of the terminal strip. This is
normally shipped jumpered directly to terminal 9, but the jumper may be
removed to add a field installed shutdown switch. Reset the external
switch.
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