DOC. SIE10110 Rev. 6 Page 33 of33
4 PROTECTIONS
- If the test set is not connected to the ground, the test set does not allow for power generation, and
warns the operator with a diagnostic message.
- Fuse on the mains supply.
- At power-on, a diagnostic sequence controls:
. Key microprocessor board components;
. Auxiliary supply voltages.
If something is wrong, the operator is alerted by a message.
- Emergency pushbutton: if pressed, all main outputs are removed.
- The high voltage output has the following protections:
. Confirmation key: if not turned, the HV output is not generated;
. The HV is generated only if selected; the HV selection is confirmed by warning lights;
. It is impossible to start generating the HV unless the adjustment knob is at zero.
- Thermal (NTC) sensor on the main and auxiliary transformers. In case of over-temperature, an
alarm message is displayed.
- Thermal sensor on the electronic switch (SCR) that controls current injection, and of the internal
temperature. In case of over-temperature, an alarm message is displayed.
- If maximum current limits and time duration of power transformer generators are trespassed, the
generation is interrupted, and the operator is warned by an alarm message. Note that the opening
action is driven directly, and it is not influenced by any possible problem on the microprocessor.
- The 20 mA measurement input is protected by a fuse against wrong connections. The fuse is a
PTC resistor, that increases its value and self-restores in some minutes.
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