F&F PF-421 TRMS, Руководство пользователя

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If the output phase voltage is 10 V below the set value or 10
V above it, the switchover will occur with a 10-second delay. If
the phase value goes beyond this range, it will be disconnected
immediately (about 200 ms).
In both cases, when the voltage of either phase is not in the cor-
rect range, the output load is disconnected. Switching the out-
put to a phase with incorrect parameters is not possible.
The operating voltage range for all three phases is set using the
Vmax and Vmin knobs. The Vmax knob determines the maxi-
mum allowable output voltage, while Vmin determines the min-
imum voltage. If the phase voltage value is between the Vmin
and Vmax thresholds, it is considered normal.
Incorrect connection of the input wires (N connected
in the wrong place) will switch the leads at the output,
which means that in the place where the N potential
should appear the phase voltage connected to the N
input terminal will appear. The N potential will appear
where the potential of the selected phase should ap-
pear. If the voltage of the phase connected to the N
terminal is incorrect, the output will be completely dis-
connected, but the potential of the incorrectly connect-
ed phase will still be present at the output!