Solcon RVS-DN 105, Инструкция по эксплуатации, Страница: 81 / 100

81 • Control Keypad
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7.7.7
Fault Parameters – Page 6
FAULT PARAMETERS
- **** -
Displays in MAXIMIZED MODE only
(refer to section 6.5.1 page 56 for changing mode)
Display and Default
Values
Range Description Remarks
PHASE LOSS protection trips the RVS-DN when 1
or 2 phases are missing for more than 1 sec.
Notes:
If RVS-DN trips on PHASE LOSS do the following:
(1) In cases where the current transformers are
connected externally (RVS-DN 950-3000A
models), verify that that the current transformers
are not grounded. Each current transformer is
connected with its 2 wires only and these wires are
not grounded externally.
(2) Check phase voltages related to terminal 21
even if terminal 21 is not connected. Verify that
phase voltages are within the required range of line
to neutral voltages.
(3) Verify that terminal 21 is connected correctly.
For terminal 21 connection refer to section
4.1
page 19.
(4) If terminal 21 is connected correctly,
disconnect terminal 21 and try to start when
terminal 21 is disconnected.
(5) If all previous actions are do not solve the
problem
and the you are sure that no real phase
loss exists, you can set PHASE LOSS Y/N
protection to NO.
This situation can occur in rare cases when there is
no real fault but the RVS-DN recognizes unusual
behaviour like when Total Harmonic Distortion in
Voltage (THDV) in the network is high.
(6) If this is a true case of PHASE LOSS then
after setting PHASE LOSS Y/N protection to NO
the motor will single phase and most likely be
tripped by the over load protection mechanism.
(7) PHASE LOSS setting is not valid in RVS-DN
1000V and RVS-DN 1200V.
(8) Phase loss might not be detected in motor
operating under a light load.
PHASE LOSS Y/N
YES
YES
Note:
The range
of the
PHASE
LOSS can
be
extended to
YES or NO
by using the
EXPANDE
D SETTING
as
described in
section
6.5.5 page
58.
Sets PHASE
LOSS trip
WARNING! Do not set PHASE LOSS to
NO unless it is found to be
necessary in the field!
PHASE SEQ. Y/N
NO
NO/YES Sets PHASE
SEQUANCE
trip
When RVS-DN is connected Inside Delta, you can
not set PHASE SEQUENCE protection to NO.