128 • Trouble Shooting
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Problem
What To Do
UNDER/NO
VOLTAGE trip occurs
immediately after
starting.
Verify that the Mains voltage is connected (no open Isolator, etc.).
Verify by listening, that the Line Contactor is closed at start, at least for a
short period of time (until the Trip command opens it).
If an external Line Contactor is used, ensure that its auxiliary contact is wired
back to the HRVS-DN cabinet and used (in series with RS relay) to apply the
start command in terminals 5 & 6 in the Control Module (this contact should
not be bridged in the customer terminals.
Check UNDERVOLT TRIP setting level in the MAIN & PROTECT setting
page.
Verify that the fuse located in the EPT-Rx connector did not melt. Refer to
section
10.2.4 page 93.
Check that the 15 pin white connector is properly connected, at the back of
the HRVS-DN Control Module
Disconnect and secure the mains source.
Check EPT-Tx to EPT-Rx fiber optic connections.
If required perform a second low voltage test .
OVER VOLTAGE trip
occurs immediately
after starting.
Verify that HRVS-DN rated voltage is identical to mains voltage.
Check OVERVOLT TRIP setting level in MAIN & PROTECT page.
If the unit is powered from the generator, check its output voltage.
PHASE SEQUENCE
trip occurs
immediately after
starting.
Phase sequence of the mains lines is wrong.
Two options are available:
o
Swap two input lines.
o
Set PHASE SEQUENCE setting in FAULT PARAMETERS as
required.
TOO MANY STARTS
trip occurs
immediately after
starting.
Check and verify correct settings of the following parameters in the START
PARAMETRS page: NUMBER OF STARTS, STARTS PERIOD and START
INHIBIT. Refer to section
7.8.3 page 60.
Warning
: Wait at least the required time between starts to prevent damage,
both to the starter and motor !
S.SCR OR WR CON.
Trip occurs after
starting.
Verify that the Current Gain dip switches are set to ON.
Disconnect medium voltage and verify that motor and mains input are
properly connected.
Check that all fiber optic wires are properly connected.
Set SOFT START CURVE 0 and try to start.
o
If the problem is solved and the start process is OK, leave it on SOFT
START CURVE 0. Set SOFT STOP CURVE 0 as well.
o
If the problem is not solved then the measured current in one or more
phases may be too low.
Another reason can be nonstandard motor parameters.
SOFT STOP CURVE 0 may enable it to function properly, even if the mains
conditions are not ideal or with non-standard motor. Current in every phase
must however be above 10% of starter FLC, or the same trip may occur.
SET CURVE TO 0
trip occurs after
starting.
Mains and system conditions are not optimal for other than SOFT START 0
and SOFT STOP CURVE 0. Set both parameters in START PARAMETERS
page and in STOP PARAMETERS page.
Try to start the motor again.
Motor makes irregular
noise while starting.
Check that all fiber optic wires are properly connected.
Try to start with SOFT START CURVE 0.
If the problem is resolved, check the current transformers and their wiring.
SOFT START CURVE 0 may enable it to function properly even if a CT or its
wiring are faulty.
O/C-SHEAR PIN trip
occurs immediately
after starting.
Verify that current Gain dip switches are set to on and not left in the
high gain off position, used for the low voltage test.
Try to start and stop with SOFT START 0 and SOFT STOP CURVE 0.
If the problem is solved, check the current transformers and their
wiring.
Check that all fiber optic wires are properly connected.
