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6.3
Calibration of thermal relay
This is required to avoid motor burn-out in the event of a signifi-
cant increase in power absorption caused by a missing phase.
•
If the motor is star-powered, 400V, the cursor should be po-
sitioned to "MIN".
•
If the motor is delta-powered, 230V, the cursor should be po-
sitioned to "MAX".
Even if the scale of the thermal cut-out does not include rated mo-
tor absorption at 400V, protection is still ensured in any case.
D867
6.4
Current to the UV photocell
Min value for a good work: 70 µA.
If the value is lower, it can depend on:
–
exhausted photocell;
–
low current (lower than 187 V);
–
bad regulation of the burner.
In order to measure the current, use a microammeter of 100 A
c.c., connected to the photocell, as in the scheme, with a capac-
itor of 100 F - 1V c.c. at the same level of the instrument.
See Fig. 31.
D1143
20034985
Electrical system
WARNING
Fig. 30
Fig. 31
26
GB
–
Do not invert the neutral with the phase wire
in the electricity supply line. Any inversion
would cause a lockout due to firing failure.
–
Only use original spare parts to replace the
components.
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