bonitron M3460UC, Customer Reference Manual

Page: 50 / 56

M3460
50
Below are some basic guidelines for using diodes in this manner for M3460
applications.
1.
n general, it’s best to use drives from a common manufacturer and series of
drives. Questions about the suitability of combining drives can be answered by
the drive manufactures.
2. Drives must be on same AC feed and grounding. There must be no isolation
transformers between the drives or M3460 modules. Different feeds may have
different potentials and may cause circulating currents or ground faults.
3. If line chokes or harmonic filters are used, all the drives should be connected to
the output of a single choke or filter. Individual input harmonic filters or line
chokes can cause unequal potentials with respect to earth.
4. The M3460 connection should be downstream of any input line filter. Input line
filters cause lower DC bus levels. If a M3460 is placed upstream, the Ride-Thru
DC bus can be higher than the drive bus, and current can flow through the M3460
during normal operation. This can cause constant activity and overheating. It
may be necessary to lower the threshold for these applications.
5. Ground Fault sensing should be done upstream at common point of line
connection.