Rice Lake 720i Programmable Indicator/Controller - Installation Manual - Manual (Page 104)

98 720i Installation Manual
11.0 Appendix
11.1 Troubleshooting
Table 11-1 lists general troubleshooting tips for various hardware and software error conditions. See the following
pages for additional information about specific diagnostic tools.
Table 11-1. Basic Troubleshooting
Symptom Cause/Remedy
Indicator does not power up Possible blown fuse or bad power supply.
Check all voltages on CPU board. Power supply should output both +6V and –6V
levels to the CPU board (see Figure 2-3 on page 9). If power supply appears bad,
check the small glass fuse (2.5A, 5x20mm) on the power supply board.
Front panel power indicator blinking ( )
Power supply overloaded. Check for shorts in A/D card regulators or in the
DC-to-DC converter of any installed analog output or pulse input cards.
Tare and truck data pointers are corrupt,
Tare storage is corrupt error messages at
startup Possible dead battery. Perform configuration reset then check for low battery
warning on display. If battery is low, replace battery, perform another configuration
reset, then reload files.
ERROR message in weight display Excitation voltage too low or off.
Dashes in weight display Overrange or underrange scale condition. Check scale. For out-of -range
conditions in total scale display, check all scale inputs for positive weight values.
Display reads 0.000000 Scale not updating. Check for bad option card hanging the bus.
Serial port not responding Possible configuration error. For command input, ensure port INPUT parameter is
set to CMD.
A/D scale out of range Check source scale for proper mechanical operation. Check load cell and cable
connection. Possible bad load cell: check indicator operation with load cell
simulator.
Serial scale out of range Check source scale for proper mechanical operation. Check cable connection.
Possible format mismatch between serial scale and
720i : Check SFMT
specification under SERIAL menu.
Option x Error Field bus card (Profibus, DeviceNet, or Remote I/O) in slot x failed to initialize.
Option card failure Possible defective card or slot.
Option card hardware diagnostic error Required option card not found. See Section 11.1.1 on page 99.
Note Always save copies of the indicator configuration, calibration, Revolution III ®
files on a local PC so that these
are available when a software reload or upgrade is required.