RXF PLUS MICROPROCESSOR CONTROL PANEL S70-401 IOM
Page 19
TROUBLESHOOTING
THE RXF PLUS MICROPROCESSOR
This section contains information on troubleshooting and
making corrections to the microprocessor and control cir-
cuits of the RXF unit. This section is composed of three parts:
a general information section, a troubleshooting guide, and
a section with illustrative schematics and data.
GENERAL INFORMATION
THE COMPONENTS WITHIN THE
MICROPROCESSOR CONSOLE
CAN BE INADVERTENTLY DAM-
AGED BY STATIC ELECTRICITY OR MISHANDLING.
ONLY QUALIFIED TECHNICIANS SHOULD DIRECTLY
HANDLE THESE COMPONENTS.
1. DO NOT REMOVE the microprocessor console cover or
attempt to make corrections to the microprocessor power
supply without shutting off the control power. Accidental
shorts can irreparably damage the SBC (single board com-
puter) or the display screen.
2. DO NOT HANDLE the SBC or the display screen board
when their cables are disconnected without first attaching a
ground strap to prevent static electrical discharge from your
body.
Most problems encountered with the microprocessor and
control circuits will be the result of a wiring fault, blown fuse,
or failure of a peripheral control such as a solenoid coil or a
pressure transducer. Faults in the computer, while possible,
are unlikely. If a fault develops in the computer, all functions
will cease and the display screen will go blank.
The control system of the RXF compressor consists of a
120 volt AC (high voltage) side and a DC (low voltage) side.
The 120 volt side actuates solenoids, relays, alarms, and
other electromechanical functions. The DC side operates
the computer and its various sensors. The microprocessor
console contains the SBC (single board computer) and one
display screen.
When working within the micropro-
cessor console, DISCONNECT
POWER. 120 VOLTS CAN CAUSE
INJURY OR DEATH.
To troubleshoot the low voltage side of the RXF control cir-
cuits, it is necessary to have the following tools:
1. Accurate digital multimeter.*
2. Small wire stripper.
3. Small screwdriver.
4. Small snip nose pliers.
5. 15 watt soldering iron (no larger).
6. .032,60/40 rosin core solder.
7. IC chip extraction and insertion tools.*
8. Grounding strap.*
9. Static-free grounded work surface.
* Available from Frick.
Order kit 451862, P/N 111Q0451862.
READ INPUT/OUTPUT COMMAND: #IDX
# Start command sequence.
ID Compressor ID Code.
X Read Input/Output(s) command.
Returned Answer:
A10000011000000000100000001
Character Description
Position
1 Acknowledge of command sent.
2 Oil Level Input 1
3 Remote Run Input 2
4 Remote Load Input 3
5 Remote Unload Input 4
6 Compressor Aux Input 5
7 Oil Pump Aux 6
8 Aux 1 Input 7
9 Aux 2 Input 8
10 Compressor Run Output 1
11 Slide Valve Load Output 2
12 Slide Valve Unload Output 3
13 Slide Stop Increase Output 4
14 Slide Stop Decrease Output 5
15 Liquid Injection Output 6
16 High Vi Liquid Injection
Output 7
17 Economizer Output 8
18 Alarm Output 9
19 Oil Heater Output 10
20 Oil Pump Start Output 11
21 Spare Output 12
22 Programmable Control Data Bit 0 Output 13
23 Programmable Control Data Bit 1 Output 14
24 Programmable Control Data Bit 2 Output 15
25 Programmable Control Data Bit 3 Output 16
26,27 Compressor ID Code
Example:
If the answer returned was
A10000011000000000100000001
the inputs/outputs on compressor #1
which are energized are:
Oil Level Input 1
Aux 1 Input 7
Aux 2 Input 8
Oil Heater Output 10
CHANGE COMPRESSOR MODE #IDMCRID
# Start command sequence
ID Compressor ID Code
MC Change compressor mode
X = O Off mode.
X = A Auto mode.
X = R Remote mode.
If the command #01MCR was sent, the com-
pressor mode would change to Remote and
the returned answer would be A01 followed
by carriage return, line feed.
CLEAR FAILURE COMMAND #IDKF
# Start command sequence
ID Compressor ID Code
K Clear command
X = F Clear fails.
X = R Clear recycle delay.
If the command #01KFO1 was sent, the
compressor cutout would clear and
the returned answer would be A01 followed
by carriage return, line feed.
OPERATION AND MAINTENANCE
Revised 2/97
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