F&F PF-431 TRMS Manual page 2

than 195 V or higher than 280 V. Phase with the correct parame-
ters is directed at the output of the switch. The corresponding
LED light indicates that the indicated phase is connected to the
output of the switch. L1 phase is the priority phase, i.e. that if
its parameters are correct, this phase will be always switched
to the output.
If a voltage in L1 phase would drop below 190 V, its loss or in-
crease above 280 V (the green L1 LED goes off), the electronic
system will switch phase L2 to the output (if its parameters are
correct).
In the case of a simultaneous lack of correct voltages in L1 and
L2 phases (L1 and L2 green LEDs go off), the L3 phase will be
switched to the output.
When the correct supply voltage returns to the L1 phase (voltage
in the range 190÷280 V), the system switches this phase to the
output.
After connecting the supply voltage the system blinks once with
all LEDs, which indicates the appearance of voltage on the device
(but not on the output). Then the device analyzes the network
parameters and switches to the appropriate phase output. If the
power supply N wire is connected to the wrong place, instead of
switching one of the phases to the output, the device will signal
an incorrect connection by lighting the LEDs in the order L1, L2,
L3 („passing" diode). In this case, disconnect the power supply
from the device and connect the input wires correctly.
Prolonged operation with incorrectly connected neutral
wire can cause irreparable damage to the controller.
The device also monitors the voltage at the output contact,
which allows you to detect the "gluing" of the internal relay con-
tacts. If this situation is detected, all 3 LEDs will flash cyclically.
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