4. UNIT SELF TEST.
The self test checks proper functioning of the product, especially the safety circuits, and is activated
every time the unit is switched on. The tests are performed by the main micro-controller in
combination with the safety micro-controller and take approximately 3 seconds.
When one or both of the controllers detect an error, the output will be disabled. A message will be
shown to the user.
The Guidance E/C has a safety relay (RLY13). This relay (Normally Open) is integrated in the
applied part of channel A and Channel B (same relay). In case of a problem, the safety relay will be
switched off immediately and the patient becomes disconnected from the unit.
The safety relay driver circuitry is accessible to the main microprocessor for 3 seconds after power
up of the unit. After this period the main micro-controller will not be able to switch the
electrotherapy safety relay on any more. Both the main and the safety micro-controller are able to
switch the electrotherapy safety relay off (the safe state).
During the selftest of the unit, the following items are checked:
1. Main controller test.
2. Safety controller test.
3. Safety software test.
4. Electrotherapy DAC test Channel A
5. Electrotherapy DAC test Channel B
6. Electrotherapy relay test.
7. Electrotherapy safety comparator test.
8. AC/DC relay test.
9. CC/CV mode test.
.
Phyaction Guidance E/C – service manual version 0.5 Page 13
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