Westric DW Series, Installation, Operation And Maintenance Manual

Page: 17 / 48

76-1002-00 Page 17 of 48
Missing phase, under- or over-voltage sensor
This feature protects the unit from missing phase or phase asymmetry. It also protects the
unit from too high or too low voltage electrical supply.
The green light
U
indicates normal power supply.
Green light
U
and yellow light
R
indicate normal power supply, phase symmetry and
normal voltage value on all phases.
Otherwise the following could happen:
1.
The
U
light is not On, which indicates that no power is supplied to the main switch or
that it is Off. In this case raise the switch and check the main supply of the unit.
2.
The
R
light is not On, which indicates that input power to the unit is not symmetrical.
Place the phases
(3 x 380) in symmetry (R - S - T)
, reversing two phase inputs to
the main switch. If upon reversing both phases the power supply is not enabled, you
will have to check for 220V between Neutral and the three phases, otherwise you
must identify
Neutral
, (which cannot be mixed between phases) and set the phases
in
SYMMETRY
. Then the protector will turn on the
R
light.
3.
The
U
light remains Off and the following lights may be turned on:
>U
= Over Voltage (The power company livered higher voltage than normal, wait until voltage is back to
normal)
<U
= Under Voltage (The power company delivered lower voltage than normal, wait until voltage is back to
normal)
P
= Missing Phase (The power company did not deliver power on one phase. In this case call the power
company and ask them to solve the problem).