148 Troubleshooting, Diagnoses and Maintenance Emotron AB 01-4429-01r2
12.2 Trip conditions, causes and
remedial action
The table later on in this section must be seen as a basic aid
to find the cause of a system failure and to how to solve any
problems that arise. A variable speed drive is mostly just a
small part of a complete VSD system. Sometimes it is diffi-
cult to determine the cause of the failure, although the varia-
ble speed drive gives a certain trip message it is not always
easy to find the right cause of the failure. Good knowledge
of the complete drive system is therefore necessary. Contact
your supplier if you have any questions.
The VSD is designed in such a way that it tries to avoid trips
by limiting torque, overvolt etc.
Failures occurring during commissioning or shortly after
commissioning are most likely to be caused by incorrect set-
tings or even bad connections.
Failures or problems occurring after a reasonable period of
failure-free operation can be caused by changes in the system
or in its environment (e.g. wear).
Failures that occur regularly for no obvious reasons are gen-
erally caused by Electro Magnetic Interference. Be sure that
the installation fulfils the demands for installation stipulated
in the EMC directives. See chapter 8. page 41.
Sometimes the so-called “Trial and error” method is a
quicker way to determine the cause of the failure. This can
be done at any level, from changing settings and functions to
disconnecting single control cables or replacing entire drives.
The Trip Log can be useful for determining whether certain
trips occur at certain moments. The Trip Log also records
the time of the trip in relation to the run time counter.
12.2.1 Technically qualified personnel
Installation, commissioning, demounting, making measure-
ments, etc., of or at the variable speed drive may only be car-
ried out by personnel technically qualified for the task.
12.2.2 Opening the variable speed
drive
The connections for the control signals and the switches are
isolated from the mains voltage. Always take adequate pre-
cautions before opening the variable speed drive.
12.2.3 Precautions to take with a
connected motor
If work must be carried out on a connected motor or on the
driven machine, the mains voltage must always first be dis-
connected from the variable speed drive. Wait at least 5 min-
utes before continuing.
12.2.4 Autoreset Trip
If the maximum number of Trips during Autoreset has been
reached, the trip message hour counter is marked with an
“A”.
Fig. 109 Autoreset trip
Fig. 109 shows the 3rd trip memory menu [830]: Overvolt-
age G trip after the maximum Autoreset attempts took place
after 345 hours, 45 minutes and 12 seconds of run time.
WARNING: If it is necessary to open the VSD
or any part of the system (motor cable
housing, conduits, electrical panels,
cabinets, etc.) to inspect or take measure-
ments as suggested in this instruction manual, it is
absolutely necessary to read and follow the safety
instructions in the manual.
WARNING: Always switch the mains voltage
off if it is necessary to open the VSD and wait
at least 5 minutes to allow the capacitors to
discharge.
WARNING: In case of malfunctioning always
check the DC-link voltage, or wait one hour
after the mains voltage has been switched
off, before dismantling the VSD for repair.
830 OVERVOLT G
Trp A 345:45:12
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