97 • Trouble Shooting
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SHORTED SCR
Trips the RVS-DN and prevents starting if any SCR is short-circuited or
when motor windings are shorted.
Check with an ohmmeter between L1-U, L2-V, L3-W; resistance > 20 KΩ.
Check for no voltage on terminals U, V, W (from parallel system or an independent
bypass).
SCRs may fail due to:
* High short current not protected by proper fuses
* High voltage spikes not protected by proper external varistors.
* Frequent starting at maximum conditions or fault conditions.
See note 1 at the end of this section.
OVER
TEMPERATURE
Heat-sink over-temperature. Trips the RVS-DN when the heat-sink
temperature rises above 85°C.
Improve cooling or use a bypass contactor. Check that motor starting is not too
frequent.
EXTERNAL
FAULT
Trips the RVS-DN when a N.O. contact between terminals 19-21
closes for over two seconds.
Check contact position and cause of closure.
WRONG
PARAMETERS
Parameters not transferred from RAM to EEPROM or vice versa.
After loading new software version or after power up, press Reset, then Mode and
▼ simultaneously and save the default parameters by pressing Store and Mode
simultaneously.
(If the Fault LED is on, press Reset after WRONG PARAMETERS).
Refer to section
7.4 page 62 for reviewing and modifying parameters.
O/C or WRONG
CON.
Trips the soft RVS-DN when connected Inside Delta and Wrong
connection or if over current is detected by the RVS-DN.
Verify that the motor is not stalled or shorted and check cables and wiring.
Verify that motor and RVS-DN are connected exactly as shown in section
4.22
page 30.
If circuitry is 100% confir
med it is possible to start when dip switch #7 (expanded
settings) is on. Refer to section
6.5.5 page 58. If a fault occurs again consult the
factory. The operator is advised to try operating one time only. Note that it is
useless to try starting in this mode more than once.
COMM. PORT
FAILED
Trips the RVS-DN if, when controlled via Profibus communication link, the
communication cable is torn or the communication from the PLC is lost.
Note that the occurrence of this fault depends on then “Watch Dog” function of the
Profibus controller.
You must reconnect the wiring and/or the communication with the PLC and wait for
a start command initiated by the PLC.
MODBUS TIME
OUT
If no valid Modbus communication during MODBUS TIME OUT, the HRVS-DN will
trip. Trip occurs only if the following conditions exist:
• SER. LINK CONTROL is set to ENABLE
• SERIAL LINK NO. is not set to OFF
For MODBUS TIME OUT settings refer to section
7.7.9 page 85.
Note 1:
When operating in DA:GENERATOR PARAMETERS, SHORTED SCR and WRONG CONNECTION
faults are not active.
If required, these faults may be eliminated by IMPLEMENTING DA:GENERATOR PARAMETERS.
Refer to section
4.17 page 28 for setting the RVS-DN in DA:GENERATOR PARAMETERS wiring.
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