TECO F33 Series, Instruction Manual, Page: 158 / 192

Troubleshooting, Diagnoses and Maintenance 155
* = 2...6 Module number if parallel power units (size
300–1500 A)
12.3 Maintenance
The variable speed drive is designed not to require any
servicing or maintenance. There are however some
things which must be checked regularly.
All variable speed drives have built-in fan which is
speed controlled using heatsink temperature feedback.
This means that the fans are only running if the VSD is
running and loaded. The design of the heatsinks is
such that the fan does not blow the cooling air through
the interior of the VSD, but only across the outer sur-
face of the heatsink. However, running fans will always
attract dust. Depending on the environment the fan
and the heatsink will collect dust. Check this and clean
the heatsink and the fans when necessary.
If variable speed drives are built into cabinets, also
check and clean the dust filters of the cabinets regu-
larly.
Check external wiring, connections and control signals.
Tighten terminal screws if necessary.
Desat
Failure in output stage,
desaturation of IGBTs
- Check on bad motor cable connections
- Check on bad earth cable connections
- Check on water and moisture in the
motor housing and cable connections
Desat U+ *
Desat U- *
Desat V+ *
Desat V- *
Desat W+ *
Desat W- *
Desat BCC *
DC link error
DC link voltage ripple exceeds maximum
level
- Make sure all three phases are properly
connected and that the terminal screws are tightened.
- Check that the mains supply voltage is within the limits
of the VSD.
- Try to use other mains supply lines if dip is caused by
other machinery.
PF Curr Err * Error in current balancing
- Check motor.
- Check fuses and line connections
PF Overvolt * Error in voltage balancing
- Check motor.
- Check fuses and line connections.
PF Comm Err * Internal communication error Contact service
PF Int Temp * Internal temperature too high Check internal fans
PF Temp Err * Malfunction in temperature sensor Contact service
PF DC Err * DC-link error and mains supply fault
- Check mains supply voltage
- Check fuses and line connections.
PF HCB Err * Error in controlled rectifier module (HCB)
PF Sup Err * Mains supply fault
- Check mains supply voltage
- Check fuses and line connections.
LC Level
Low liquid cooling level in external reservoir.
External input (DigIn 1-8) active:
- active low function on the input.
NOTE: Only valid for VSD types with Liquid
Cooling option.
- Check liquid cooling
- Check the equipment and wiring that initiates the
external input
- Check the programming of the digital inputs DigIn 1-8
Table 31 Trip condition, their possible causes and remedial action
Trip condition Possible Cause Remedy