Troubleshooting Analog Inputs And Outputs - Frick QUANTUM Maintenance Manual

5. If the voltage is OK, check the wiring external to
the panel.
6. If voltage is not OK, check the fuse.
7. If the fuse is OK then check the module.
8. If the module is OK, check for proper panel
voltage on the DIO connector plug between
position 3 (Hot) and position 4 (neutral).

Troubleshooting Analog Inputs and Outputs

The "Service Screen" has been provided to view the raw
data from an Analog Board. There is a separate screen for
each of the Analog Boards that are present. Analog values
are converted from binary to show volts. The error factor is
± .05 volts.
Checking The Analog Inputs and Outputs
The Analog I/O Boards have numerous jumpers that must
be properly selected. There are sixteen analog input
channels that can be selected for 4-20ma, 0-5Vdc, or
ICTD. Channel #16 will also take the 0-5 Amp motor CT
as an input. All of these jumper settings are listed later in
this manual (Jumper and Dipswitch Settings Section).
Besides properly setting the hardware jumpers, each
channel is setup in software for the proper transducer type
and range, and each transducer must also be calibrated
through the appropriate
Improper setup of either the hardware or software will
result in improper operation or range.
FRICK QUANTUM COMPRESSOR CONTROL PANEL
MAINTENANCE
"Service Screen" - Digital Board Inputs and Outputs
sensor calibration screen.
Troubleshooting an Input
1. Make sure the LED associated with the input is
on when power is applied to the module.
2. If the LED is on then the fuse and input module
are good.
3. If the LED is on and there is no input voltage,
replace the input module.
4. If the LED is not on when power is applied, check
the fuse.
5. If the fuse is good, replace the input module.
The most common fault associated with the reading of the
analog channels other than hardware or software setup
problems fall into one of the following categories: Sensor
fault, wiring problem, improper grounding of system.
An open wire, shorted wire, or faulty sensor will usually
give a reading at either the minimum or maximum end of
the range scale. An erratic reading or a reading that
seems to float up and down is usually indicative of a
grounding problem. When a single transducer or cable is
shorted to earth (or system) ground, this can show up as a
whole assortment of problem channels. The easiest way
to find a short to earth problem is to disconnect all the
sensor plugs and ohm out each plug screw terminal to
earth for open (infinite) impedance. All sensors should
read open to earth with the exception of the CT motor
current channel. One side of the CT is grounded in the
Motor Control Center (MCC). (The third pin on pressure
sensors is ground.)
S90-010 M
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