RXF PLUS MICROPROCESSOR CONTROL PANEL S70-401 IOM
Page 21
TROUBLESHOOTING FRICK SBC MICROPROCESSOR SYSTEM (Continued)
SYMPTOM PROBABLE CAUSES and CORRECTIONS
MOTOR LOAD CONTROL The current transducer is used to convert the AC motor amps to a DC voltage signal for the
(FORCED UNLOAD) OCCURS microprocessor. If the %FLA reading from the Operating display is incorrect, consult Frick Co.
PRESSURES ON THE TEST 1 - Shut down the compressor and allow pressures to equalize. Discharge pressure
OPERATING DISPLAY and oil pressure should have the same reading.
DO NOT APPEAR CORRECT
TEST 2 - If either oil pressure or discharge pressure read different pressures, one or both
transducers are at fault. Valve off the suction transducer from the unit and open the vent
valve on transducer manifold to atmosphere. If the suction transducer reads atmospheric
pressure, then the suction transducer is correct.
NOTE: A 1% tolerance is allowed for all transducers.
OIL PUMP DOES NOT START Verify that the Oil Pump HAND-OFF-AUTO switch (1SS) is in the AUTO position and
(Optional) that the Emergency Stop Button is not depressed.
Output 11 controls the Oil Pump Starter Relay (3CR) when in the AUTO mode. If HAND is
selected on 1SS, Output 11 will not have any effect on the operation of the oil pump starter.
If AUTO has been selected and the oil pump does not start, check for 120VAC between Wires
39 and 2. If 120VAC is not found when the LED for Output 11 is on, check the fuse (FU11).
If the problem persists, check the control relay (3CR).
The Oil Pump Starter Auxiliary Contact switches voltage to Input 6 (Wires 28 and 2) when the
auxiliary contacts are closed and the AUTO mode is selected on 1SS. If the Input does not turn
on and voltage is present at Input 6, consult Frick Company.
OIL PUMP IS RUNNING BUT The (HAND-OFF-AUTO) Oil Pump Selector Switch (1SS) controls oil pump operation
THE COMPRESSOR DOES and must be in the AUTO position before the compressor can be started.
NOT START (Optional)
Verify that the Slide Valve has unloaded to 5% or less. If the Slide Valve has not unloaded,
troubleshoot the hydraulic system. The compressor will not start until the Slide Valve is unloaded.
Output 1 controls the motor starter. Check between terminals 38 and 2 for 120VAC. If 120VAC
is not found when the LED for Output 1 is on, check the fuse (FU1).
COMPRESSOR DOES NOT Verify that the [AUTO] key has been pressed and AUTO appears under SV Pos on the
AUTOMATICALLY Operating display #4.
LOAD OR UNLOAD
If the problem persists, see the Troubleshooting section SLIDE VALVE DOES NOT LOAD
and/or UNLOAD.
DISPLAY SCREENS DISPLAY A loose or improper connection between the displays and the SBC is indicated. Remove fuse
SCRAMBLED PATTERN OR (2FU, 10 amp) for 15 seconds, then restore to reset the displays.
LIST ALPHABET
ANNUNCIATOR DISPLAY E2PROM chip malfunction or bad. The system may still be run by resetting all Adjustable Setpoints
MESSAGE “BAD E2PROM and clearing Annunciator Display. If condition repeats, replace E2PROM chip in slot U6.
CHIP U6”
MAINTENANCE
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