Emotron EMX-D, Instruction Manual

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Emotron AB 01-5016-01r0 Troubleshooting, Diagnoses and Maintenance 35
8. Troubleshooting, Diagnoses and Maintenance
8.1 Trips, warnings and limits
In order to protect the variable speed drive the principal
operating variables are continuously monitored by the sys-
tem. If one of these variables exceeds the safety limit an
error/warning message is displayed. In order to avoid any
possibly dangerous situations, the inverter sets itself into a
stop Mode called Trip and the cause of the trip is shown in
the display. Trips will always stop the VSD.
“Normal Trip”
• The VSD stops immediately, the motor coasts to a
standstill.
• The relay is active.
• The Trip LED is on.
• The accompanying trip message is displayed.
• The “TRP” status indication is displayed (area E of the
display).
“Warning”
• The inverter is close to a trip limit.
• The relay is active.
• The Trip LED is flashing.
• The accompanying warning message is displayed in win-
dow [722] Warning.
• One of the warning indications is displayed (area G of
the display).
“Limits”
• The inverter is limiting torque and/or frequency to avoid
a trip.
• The Trip LED is flashing.
• One of the Limit status indications is displayed (area E
of the display).
Tripped Rotation monitor
If there are no pulses from the rotation sensor there is
following indications:
• The Trip relay is active.
• The Trip LED is fl “Rot. Alarm” shown in the
display.
8.2 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 3.4.3 page 11.
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.
Table 9 List of trips and warnings
Trip/Warning
messages
Selections
Trip
(Normal/
Soft)
Warning
indicators
(Area D)
PTC Trip/Off Normal/Soft
Over temp On Normal OT
Over curr F On Normal
Over volt D On Normal
Over volt G On Normal
Over volt On Normal
Under voltage On Normal LV
Power Fault On Normal
Desat On Normal
DClink error On Normal
Ovolt m cut On Normal
Over voltage Warning VL
Motor PTC On Normal
Rot.Alarm On Normal