SMB350 User’s Manual
Page 29
(2) The auxiliary power is available in models for either 120 or 240 VAC. If
120VAC is applied to a 220VAC model, the SMB350 will not be damaged, but it
won’t work either. But if 220VAC is applied to a 120VAC model, then the unit
will be damaged.
(3) The SMB350 only considers the absolute value of the current and disregards
the direction; thus, the current and energy values can only be positive.
However, we still recommended that the current transformers be connected
with the correct wiring orientation.
(4) The communication cable is polarity sensitive. RS485 requires that all positive
terminals are connected together, and all negative terminals are connected
together, reversing any one on any single device will cause the entire RS485
bus to collapse and all communication will fail. If the polarity to any one device
is inconsistent with the rest, simply reverse the polarities and the
communication should be restored.
Q. I have checked and followed all the troubleshooting guidelines but my
problem is still not resolved, what should I do?
A. Contact our technical support by phone or email before concluding that the unit is
faulty and removing it. Our technical support team will help to diagnose your
problem and provide advice on potential fixes. Please see section 7,
“Supplementary Information”.
