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It is also used to extinguish any fault LED's that are illu-
minated. In addition, it is used in the procedure to adjust
operating pressure. See "Programming the Load–Un-
load Pressure Setpoints," page 21. The LED is illumi-
nated whenever the unit is stopped for any reason EX-
CEPT a normal shutdown in one of the "AUTO" modes.
A flashing LED indicates that a reset is required.
Damage will occur to the machine if it
is repeatedly restarted after any one
of the shutdown modes stops opera-
tion of the unit. Find and correct the
malfunction before resuming opera-
tion.
"CONSTANT RUN" Button With LED – This button
is used to operate the unit in the constant run mode. In
this mode, the compressor runs continuously, loading
and unloading in response to air demand. It will contin-
ue to run until stopped, either manually or by a protec-
tive shutdown. The LED is illuminated at all times while
running in this mode.
"AUTO LEAD" Button With LED – This button is used
to operate the unit in "Auto–Start–Timed–Stop" mode,
either by itself, or as the lead compressor in a Lead/Lag
arrangement. Loading and unloading occurs as in the
"CONSTANT RUN" mode, however, if the compressor
runs unloaded for a period of 10 minutes, the unit is
stopped. At this point, the compressor remains in the
"AUTO LEAD" mode and will restart when the system
pressure reaches the 'load' setpoint programmed into
the controller. The LED will remain illuminated through-
out the cycle.
Automatic restarting or electrical
shock can cause injury or death.
Open, tag and lockout main discon-
nect and any other circuits before
servicing the unit.
"AUTO LAG" Button With LED – This button is used
to select the 'lag' unit in a lead–lag arrangement. Op-
eration is identical to "AUTO LEAD" except that the
start–load and unload setpoints are automatically 5 PSI
(.3 Bar) lower than programmed.
Any mode may be selected at any time
without stopping the compressor.
"HIGH AIR TEMPERATURE" LED – This LED is used
to indicate an over temperature condition at either the
compressor or oil separator discharge. At the time of a
high temperature shutdown, the LED is illuminated and
the temperature digital readout is locked on to the of-
fending temperature. Illumination of the decimal point
in the lower right hand corner of the digital readout indi-
cates that the temperature displayed is at the oil sepa-
rator. A non–illuminated decimal point indicates com-
pressor discharge. Pressing "STOP/RESET" will
extinguish the LED (if the temperature has lowered be-
low 225 F, 107 C) and revert the digital readout to dis-
playing actual discharge temperature.
"MOTOR OVERLOAD" LED – This LED indicates that
one of the motor overload relays has tripped. The over-
load relay itself must be reset before pressing "STOP/
RESET" will extinguish the LED.
"CHANGE SEPARATOR" LED – This LED flashes
when the differential pressure across the oil separator
reaches approximately 8 PSI (.6 Bar). At this point,
schedule the separator element for service at the earli-
est opportunity. (See Section 5, page 37, for separator
maintenance.)
Should the condition be ignored and allowed to further
deteriorate, the compressor will be shutdown and the
LED illuminated steadily when the differential pressure
reaches 15 PSI (1.0 Bar).
Machine damage will occur if com-
pressor is repeatedly restarted after
any one of the shutdown modes
stops operation of the unit. Find and
correct the malfunction before re-
suming operation.
"CHANGE AIR FILTER" LED – This LED is used to
signal when the air filter requires servicing or changing.
It is a reminder only and will not stop or impede the op-
eration of the unit. Operating the compressor with the
LED illuminated risks collapse of the filter and ingestion
into the compressor.
13–8–606
Page 20
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Table of Contents
Troubleshooting
