Doc#
100576
• REV C
(Sept 2017) Page
29 of 42
5. TROUBLESHOOTING
5.1 MX2033 AND MX2034
Symptom
Possible Problems
Recommended Action
SIG stuck near -21V
Probe is disconnected
Verify that the probe is properly
connected and the gap is in the OK
region.
SIG stuck at -Vt
SiG shorted to power
Disconnect the SIG line at the
DPS and measure the DPS voltage
between SIG and COM. If this
measures correctly, the short is in
the field wiring.
SIG stuck 0 < Vout <
-0.05V
Probe is shorted
Probe is disconnected
(MX2030 or 3300)
Verify that the probe is properly
connected and the gap is in the OK
region.
SIG stuck at 0 V
Signal wire disconnected
Output shorted to common
Power or common discon-
nected
Measure between –Vt and COM
at the DPS and verify the input
power is within the specified
range.
Disconnect the SIG wire and mea-
sure between SIG and COM at the
DPS to verify the SIG out voltage.
If SIG out is correct, the field wir-
ing is shorted or disconnected at
the monitor side.
Scale Factor is high
Cable length or probe series
is configured incorrectly
Verify that probe and extension
cable are of the same series and
have the correct system length.
Use the custom calibration feature
to correct the scale factor for the
given probe (see section 4.2)
Scale Factor is low
Load impedance is too low
Verify that the input impedance of
the measuring device is 10 kohms.
Scale Factor is low
Scale factor not adjusted for
safety barriers
Verify that the monitoring system
was correctly configured for safety
barriers. With barriers, the scale
factor is 192 V/mil.
Scale Factor is low
Cable length or probe series
is configured incorrectly
Verify that probe and extension
cable are of the same series and
have the correct system length.
Use the custom calibration feature
to correct the scale factor for the
given probe (see section 4.2)