2
System Description
Basic Troubleshooting Procedures
2-12
Basic Troubleshooting Procedures
To ensure proper and safe troubleshooting and repair procedures for the TLS-450PLUS consoles, the following
steps should be taken in the order they appear, prior to servicing the system:
1. Review and thoroughly understand the “Safety Warnings” on page 1-2 of this manual.
2. Review the “System Parts Identification” on page 2-1 to locate components.
3. Review “Console Power And Relay Wiring Inputs” to ensure the AC Input board is wired correctly.
4. Review “Configuration DIP Switch Settings” section to ensure the configuration DIP switches are set correctly.
5. Perform a “Intrinsic Safety Check” on page 2-12. If the system fails the Intrinsic Safety Check, turn the AC
Power circuit breaker at the service panel to the OFF position, disconnect and cap the AC wires in the monitor,
and disconnect and cap all probe and sensor field wires in the probe and sensor junction boxes.
6. Perform the “Visual Inspection of Console Interior” on page 2-13.
7. Refer to the appropriate section of this manual (or another manual, see “Related Manuals” on page 1-1) to
troubleshoot a faulty component of the system.
Intrinsic Safety Check
Turn off, tag and lockout power to the console before starting this intrinsic safety check.
Definition of Intrinsic Safety
Circuit and System
- *An intrinsically safe circuit is one in which any spark or thermal
effect is incapable of causing ignition of a mixture of flammable or combustible material in air under prescribed test
conditions. An intrinsically safe system is an assembly of interconnected intrinsically safe apparatus, associated
apparatus, and interconnecting cables in that those parts of the system that may be used in hazardous (classified)
locations are intrinsically safe circuits.
*Excerpt from latest National Electrical Code Handbook.
1. Verify that the TLS console is installed indoors in an accessible location.
WARNING
FAILURE TO COMPLY WITH THE FOLLOWING WARNINGS AND SAFETY
PRECAUTIONS COULD CAUSE DAMAGE TO PROPERTY, ENVIRONMENT,
RESULTING IN SERIOUS INJURY OR DEATH.
Explosion could occur if other wires share conduits or troughs with TLS
console intrinsically safe probe, sensor, and thermistor wiring. Conduits and
wiring troughs from the console’s probes, sensors, and thermistors must not
contain any other wires and must enter the console through their designated
preformed knockouts.
Improper system operation could result in inaccurate inventory control or
undetected potential environmental and health hazards if probe-and sensor-
to-monitor wiring runs exceed 1,000 feet. Probe-and sensor-to-monitor wiring
runs over 1,000 feet are not UL approved for this application.
To avoid electrical shock resulting in personal injury, death, equipment
damage or damage to the environment, switch OFF and tag the AC power
circuit breaker at the service panel while inspecting, removing, or installing
wiring and components.
OFF
