Service Screen" - Digital Board Inputs And Outputs; Troubleshooting Digital Inputs And Outputs - Frick QUANTUM Maintenance Manual

S90-010 M
Page 10

Troubleshooting Digital Inputs and Outputs

The "Service Screen" has been provided to view the raw
data from a Digital Board. There is a separate screen for
each of the Digital Boards that are present. Digital values
are shown as ON or OFF.
Checking the Digital Inputs and Outputs
Some problems that
troubleshooting the digital inputs and outputs. The Digital
I/O (Input / Output) boards have six Digital I/O (DIO) board
connectors labeled P1 through P6. The input and output
modules are wired to a DIO connector plug. Position 3
provides power and position 4 is a neutral on the DIO
connectors. Position 1, 2, 5, and 6 are signal connections.
The Digital I/O board's I/O modules are configured by
proper module selection, AC or DC, operating voltage,
input or output, and moving the fuse to the "in" or "out"
position. An LED is associated with each module and
displays the state of each module. A lighted LED
represents an Input that is "High" or an Output that is "On".
Each of the sixteen modules has a corresponding software
configuration screen.
If a properly configured Digital I/O is not responding
correctly, first look at the digital board on the "Service
Screen" and check if the module is on. If it is not on, check
if the LED on the digital board is also not lit. If the LED is
not lit, then check the fuse. If the fuse is OK, then check
the module.
FUSE TESTING AND REPLACEMENT
1. Power off the panel.
2. Open the panel door.
3. Remove the questionable fuse.
4. Place the questionable fuse into the fuse tester at
the bottom of each digital I/O board.
5. Power on the panel.
FRICK QUANTUM COMPRESSOR CONTROL PANEL

"Service Screen" - Digital Board Inputs and Outputs

are encountered involve
MAINTENANCE
6. Check the LED on the tester. If the LED is lit, the
fuse is OK.
7.
Power off the panel.
8. If the fuse is faulty, replace the fuse with a new
plug-type fuse (Part # 333Q0001326).
Input and Output Module Testing and
Replacement
1. Power off the panel.
2. Open the panel door.
3. Replace the questionable module.
4. Power on the panel.
5. If it is an output module, check for proper panel
voltage on the DIO connector plug. Check the
voltage between position 4 (neutral) and the
associated position to the output module.
6. If it is an input module, check if the associated
LED is on when power is applied to the module.
Troubleshooting an Output
1. Make sure the LED associated with the output is
on when power is applied to the module.
2. If the LED is not on when it should be and there
is no operating condition preventing it, contact
the Frick Service Department.
3. If the LED is on when it should be, check for
proper panel voltage on the DIO connector plug.
Check the voltage between the position 4
(neutral) and the associated position to the output
module.
4. If the voltage is OK, check for proper panel
voltage between the associated position to the
output module on the DIO connector and the
associated position on the terminal strip.