Troubleshooting; Error Messages; Common Problems And Solutions - Honeywell SC1000 Owner's Manual

12.8 Troubleshooting

12.8.1 Error Messages

12.8.2 Common Problems
and Solutions
Erratic Display
Blank Display
+OVLD or -OVLD on Display
Analog Output Incorrect
Auxiliary Function Pins Not
Operating
Sensitivity to EMI/RFI
page 122 008-0608-00
See "Error Messages" on page 151 for information relating to error messages.
Check electrical connections for continuity and the transducer's and/or amplifier's
wiring code from its Certificate of Calibration and Application Note.
Incorrect wiring may have shorted the excitation power supply. Use the correct
wiring diagram to connect the transducer or amplifier to the instrument.
Make sure that the load on the transducer is constant.
Check input voltage or current to the (+)Signal ("+SIG") and (-)Signal ("-SIG") pins
with a multi-meter.
Incorrect wiring may have shorted the ±15 VDC excitation power supply. Use the
correct wiring diagram to connect the transducer or amplifier to the instrument.
Indicates that the voltage across the (+)Signal ("+SIG") and (-)Signal ("-SIG") pins
is overranging or underranging the amplifier circuit. Make certain all wires are
connected properly.
If you remove all load from the transducer and you still see this message, the
(+)Excitation ("+EXC") or (-)Excitation ("-EXC") pins may be shorted to the (+)Sig-
nal ("+SIG") or (-)Signal ("-SIG") pins.
If you remove all load from the transducer and you get a numeric reading, the
transducer may have a high zero offset. Use the channel's SETUP menu and set
-> to "ON"; in the RUN mode this will allow the [VALUE] but-
DIAGNOSTICS DISPLAY ADC
ton to display raw A/D readings as a percentage of its full-scale. If the raw A/D
readings display more than +/-10% when there is no load on the transducer, the
transducer has a high zero offset.
Make certain of the type of Analog Output (voltage or current) that the channel is
equipped with; see "Identifying the Output Type" on page 121.
Use the ->
DIAGNOSTICS DAC FULL SCALE
force the Analog Output to a known output. Then, adjust your readout device,
panel meter, PLC or data acquisition system to match.
Check the output selection jumpers; see "Output Selection" on page 121.
Make sure that the
AUX1 FUNCTION
rectly; if they are set to
DISABLED
The Auxiliary Function ("AUX1" and "AUX2") pins must be connected to pin 10,
not pin 8, to activate them.
To obtain maximum immunity to electromagnetic or radio frequency interference,
make certain that the shields of the transducer cables are connected to the "cable
shield connection screw" on the rear panel of the instrument. See "Wiring" on
page 98, "External Arrangement of AC powered SC1000 and SC2000" on
page 27 and "External Arrangement of Model SC3004" on page 33.
and ->
DIAGNOSTICS DAC ZERO SCALE
or SETUP menu items are set cor-
AUX2 FUNCTION
then they will not operate.
menu items to