13 Troubleshooting
13.1 Analog Inputs
Problem Action
20mA inputs always read 0. Check transmitter power.
Reading is at or near 0 for
all input signals.
Check if the input transient suppressers are
damaged.
20mA readings are not
accurate.
Check for a damaged 250Ω current sense
resistor.
Reading is constant. Check that the analog input is not forced.
Reading seems out of
calibration for small inputs
but improves as input
increases.
Check the input range switch setting.
13.2 Analog Outputs
Problem Action
Outputs are always 0mA Check the 24V power.
The full-scale output is less
than 20mA.
Check the 24V power.
Check that the load resistance is within
specification.
Output is constant and
should be changing.
Check that the analog outputs are not forced.
The output is 4mA when a
value of 0 is output. 0mA
was expected.
The 4-20mA output range is selected. Select the
0-20mA range.
The output is 0mA when a
value of 0 is output. 4mA
was expected.
The 0-20mA output range is selected. Select the
4-20mA range.
The output seems to be
uncalibrated at small output
values. The error improves
as larger values are output.
Check the setting of the output range switch. The
wrong output range is probably selected.
13.3 Digital Inputs
Problem Action
Input LED does not come
on when input signal is
applied.
Check the input signal at the termination block. It
should be at least 50% of the digital input range.
If this is a DC input, check the polarity of the
signal.
Input is on when no signal is
applied. The LED is off.
Check that the digital inputs are not forced on.
Input is off when a signal is
applied. The LED is on.
Check that the digital inputs are not forced off.
SCADAPack 32 Controller Hardware Manual
May 24, 2006
49
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