Circuit Board Handling; Troubleshooting - Siemens Moore 353 User Manual

UM353-1

11.2.4 Circuit Board Handling

ELECTROSTATIC DISCHARGE, ALL ELECTRONIC ASSEMBLIES
Semiconductor devices must be protected from electrostatic discharge. A properly grounded conductive wrist strap
must be worn whenever a circuit board assembly is handled or touched. A PN 15545-110 service kit with a wrist
strap and static dissipative workmat is available from Siemens Energy & Automation, Process Industries Division.
Equivalent kits are available from both mail order and local electronic supply companies.
LITHIUM BATTERY PRECAUTIONS
Each MPU Controller board and Real Time Clock/Configuration Backup board has a lithium battery that is not field
replaceable. Note the following when handling or disposing of either board.
•
Properly dispose of an unrepairable circuit board with a lithium battery
•
Do not burn the battery
•
Do not place the circuit board on a metal surface or otherwise short circuit battery terminals
•
Do not attempt to charge the battery
•
If electrolyte is exposed, wear safety glasses and rubber gloves when handling the battery
•
For details contact the battery manufacturer

11.3 TROUBLESHOOTING

Troubleshooting the controller is primarily done by error codes. Error codes are indicated on the alphanumeric
display in response to a failed power-up diagnostic test or to an on-line controller error. Section 11.4 provides a
quick reference to the identification of these codes and discusses each code with respect to the type of test or error
check, controller response, problem confirmation, and corrective action.
In the event a malfunction within the controller is suspected, troubleshooting by assembly substitution is
recommended to get the controller back on-line in the shortest possible time. The plug-in design of controller
assemblies permits rapid removal and replacement to isolate a defect. Figure 11-1 shows controller assemblies.
If a problem appears upon initial installation of the controller, check the installation wiring and the controller's
configuration parameters. Also, check the wiring of associated external process devices (e.g. process transmitter,
LonWorks modules). Field servicing experience indicates that most initial service incidents are of this nature.
Additional troubleshooting avenues are also possible. For example, a series of test configurations may be created
and implemented to 'exercise' different function blocks within the controller. Section 3 describes each function
block. This type of troubleshooting analysis is intended to be implemented in an off-line test bench situation.
On-line checks of the controller input and output signals (i.e. analog and digital) can be performed without affecting
station operation. However, this type of signal tracing is usually carried out behind an instrument panel. Refer to
the Installation section, Table 8.1, for rear terminal assignments.
March 2003
Maintenance
11-3