Troubleshooting - Fluke 7341 User Manual

This section contains information on troubleshooting, CE Comments, and a wiring
diagram. This information pertains to a number of bath models and certain specifics may
not pertain to your model.

Troubleshooting

In the event that the instrument appears to function abnormally, this section may help to
find and solve the problem. Several possible problem conditions are described along with
likely causes and solutions. If a problem arises, please read this section carefully and
attempt to understand and solve the problem. If the probe seems faulty or the problem
cannot otherwise be solved, contact an Authorized Service Center (see Authorized
Service Centers in Chapter 1) for assistance. Be sure to have the instrument model
number, serial number, voltage, and problem description available.
Problem
The heater indicator LED stays
red but the temperature does
not increase
The controller display flashes
"Cut-out" and the heater does
not operate
The display flashes "cutout" and
an incorrect process
temperature
Causes and Solutions
The display does not show "Cut-out" nor displays an incorrect bath
temperature, and the controller otherwise appears to operate normally.
The problem may be insufficient heating, no heating at all, or too much
cooling.
•
The heater power setting being too low, especially at higher
operating
•
One or more burned out heaters or blown heater fuses may also
cause this problem. If the heaters seem to be burned out, contact an
Authorized Service Center (see Authorized Service Centers in
Chapter 1) for assistance.
The display flashes "Cut-out" alternately with the process temperature.
•
If the process temperature displayed seems grossly in error, consult
the following problem: 'The display flashes "Cut-out" and an
incorrect process temperature'.
•
Normally, the cutout disconnects power to the heater when the bath
temperature exceeds the cutout set-point causing the temperature
to drop back down to a safe value. If the cutout mode is set to
"AUTO", the heater switches back on when the temperature drops.
If the mode is set to "RESET", the heater only comes on again when
the temperature is reduced and the cutout is manually reset by the
operator, see Cutout in Chapter 10. Check that the cutout set-point
is adjusted to 10 or 20°C above the maximum bath operating
temperature and that the cutout mode is set as desired.
• If the cutout activates when the bath temperature is well below the
cutout set-point or the cutout does not reset when the bath
temperature drops and it is manually reset, then the cutout circuitry
or the cutout thermocouple sensor may be faulty or disconnected.
Contact an Authorized Service Center (see Authorized Service
Centers in Chapter 1) for assistance
The problem may be that the controller's voltmeter circuit is not
functioning properly.
•
A problem could exist with the memory back-up battery. If the
battery voltage is insufficient to maintain the memory, data may
become scrambled causing problems. A nearby large static
discharge may also affect data in memory. Verify that the
parameters on the Report of Test. are accurate. Cycle the power off,
disconnect the bath from AC, and then restart the bath.
13
Troubleshooting
Troubleshooting
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