451 series
3.5 PARTIAL LOAD FAILURE DETECTION SETTING
(OPTIONAL)
To guarantee correct operation, the load current cannot be less than 10 % of the nominal
current of the thyristor unit (if a 100 W bulb is used as a load to monitor to module in a
workshop, the fault indicator light on the front fascia will always be lit up).
During commissioning, the following setting must be made:
• First of all, make sure that the module is connected correctly (do not forget to
connect terminal 8 to the neutral or to the second phase) and that the thyristors
are in permanent firing (the load current should not be less than 10 % in order
to be able to make this setting).
• Turn the partial load failure detection setting potentiometer completely
(see figure 3.4) clockwise and check that the indicator light does not light up.
• Turn the potentiometer slowly clockwise until the indicator light on the
front fascia lights up.
• Turn the potentiometer slowly anti-clockwise until the indicator light
has just switched off.
The potentiometer set in this way gives the maximum level of sensitivity in the partial load
failure detection.
The button on the front fascia, (marked "Test", see figure 3.4) which simulates a current
drop of 10 % in the load, is used to check the operation of the partial load failure circuit
without having to disconnect the load.
This button must set the module to alarm status if the setting is correct.
451-461 User Manual
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