53
Symptom Action
2
Display
flashes
on and off
(1 second
approx.)
1. Switch off the mains supply to the product.
2. Disconnect all signal wires.
3. Switch the mains supply on: If symptoms are still present, return
the product for examination.
4. Replace each signal wire in turn until the fault occurs.
5. Investigate and rectify any faults in the wiring, external sensors /
transducers and modules associated with that connection.
Explanation
The internal power supply is unable to power up. If the voltages
cannot be generated, the power supply switches off for approx.
1 second. The power supply then attempts to power up again. If the
fault is still present, the cycle is repeated until the fault is removed.
This is a safety feature and does not damage the product.
3
Product
powers up
for a period
of time
(greater than
1 minute),
then
switches off
1. Monitor the mains supply and ensure it is continuous and within
the specification limits.
2. Measure the ambient temperature and ensure it is less than
specified.
3. Investigate symptom 2.
Explanation
A re-settable thermal cut-out device will operate if one or more of
the following occurs:
- The power drawn exceeds the specification.
- The input mains voltage is lower than specified.
- The ambient temperature is higher than specified.
- The internal power supply will switch off until the product
temperature drops below 65 °C. This is a safety feature and does
not damage the product.
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