Ins
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41
BTS-Ex, non-contacting thermal switch unit
Malfunctions - Remedial Actions, Troubleshooting
In order to determine the cause of failure more precisely, the following
measures should be taken in the corresponding order:
Measurement
Result
Probable
troubleshooting
Apply supply voltage to the
evaluator.
Measure the no-load voltage and
the short-circuit current at the
NAMUR input (terminals 1 and 3).
Clear deviation from
the setpoints:
- no-load voltage 8.0 V DC
- short-circuit current 8.0 mA
Defective evaluator.
Connect the initiator to the
evaluator.
Measure the current consumption
of the initiator which is not
attenuated.
Current consumption
> 6.0 mA
or
< 2.1 mA
Defective initiator.
Connect the initiator to the
evaluator.
Measure the current consumption
of the initiator which is attenuated.
Note:
The initiator can, for example, be
attenuated with a metal plate which
is held directly in front of the
initiator head.
Current consumption
> 1.2 mA
or
< 0.1 mA
Defective initiator.
Attenuate the initiator, after proper
installation, with the switching
element, with the turbo coupling
not being overheated.
Current consumption
> 1.2 mA
and
< 6.0 mA
Defective switching
element.
Table 13
