ECO REFERENCE MANUAL
8-2
SC
SUPPLY DISTURBANCE
Many supplies are well controlled and remain in
tolerance, but are affected by local disturbances.
These can cause faulty operation and damage to
inverters. In particular, check for:
•
Power Factor Correction equipment.
Unsuppressed switching of capacitor banks
can produce very large voltage transients and
is a common cause of inverter damage.
•
High power welding equipment, especially
resistance and RF welders.
•
Other drives, semiconductor heater controllers
etc.
The inverter is designed to absorb a high level of
supply disturbance - for instance, voltage spikes
up to 2kV. However, the above equipment can
cause power supply disturbances in excess of
this. It will be necessary to suppress this
interference - preferably at source - or at least by
the installation of an input choke in the inverter
supply. EMC filters do not suppress disturbances
with this level of energy. Over-voltage protection
products such as metal oxide varistors should
also be considered in extreme cases.
Damage can also be caused by local supply
faults and the effects of electrical storms. In
areas where these are expected, similar
precautions are recommended.
Add input choke and
over voltage protection
equipment here
MICROMASTER Eco
Power factor
correction
equipment
Welders
RF heaters
etc.
Lightning, power
system faults
Large drives
and power
electronic
systems
Motor
