SMB350 User’s Manual
Page 26
Problems or Symptoms
Possible Causes and Solutions
The accumulation of kWh does not
match total consumption.
(a) Check the CT ratio if use with regular 5A output
CT. (e.g. 500A : 5A, the CT ratio = 100)
(b) Check to make sure the Aux. voltage input is
continuously 24 hrs/day.
(c) Check the CT wiring direction on load and
polarity on meters if parallel 2 or 3 CTs for any
phase. When parallel 2 or 3 CTs, the wiring
direction and polarity must be the same.
The channel shows a very poor power
factor value.
(a) Check the CT and voltage wirings and make sure
that each CT input is matched to its
corresponding voltage.
(b) Check to make sure that the measured circuit
corresponds to its phase.
(c) Use a separate instrument to independently
verify that the PF is indeed awry. If so then check
the circuit and load to determine what is causing
the PF to go askew.
