MI 2893 / MI 2892 / MI 2885
Connection setup
155
Measure-
ment
Status
Description
Action to resolve issue
U
Measured voltage is within 90% ÷ 110%
range. All voltage measurements (RMS,
harmonics, voltage events) are valid.
U
Measured voltage is not within 90% ÷
110% range of Nominal voltage. All
voltage measurements (RMS, harmonics,
voltage events) can be compromised.
Set correct Nominal voltage value
and check voltage leads.
I
Measured current is within 10% ÷ 110%
of selected clamp measuring range. All
current measurements (RMS, harmonics,
voltage events) are valid.
I
Measured current is within 5% ÷ 10% or
110% ÷ 150% of selected clamp
measuring range.
If higher current is expected
during recorder campaign, this
waning can be ignored.
Otherwise, it is recommended to
decrease current range.
I
Measured current is less than 5% or
higher than 150% of clamp measuring
range. Accuracy of current measurements
(RMS, harmonics…) can be compromised.
Go to Current clamp settings and
change Clamp Measuring Range
or press AUTOSET I button and
let instrument to choose optimal
current range.
Phase
Phase angle between voltage and current
is less than 90
0
. This indicate that
measured current flow in the same
direction as voltage. Power
measurements are valid.
Phase
Phase angle between voltage and current
is more than 90
0
. This indicate that
measured current has opposite flow than
voltage. Power measurements are
compromised.
Check clamp direction (
icon
is present in status bar) and see if
current channel corresponds to
the voltage channel (if current I
1
is measured on voltage U
1
)
Useq
123
Voltage sequence is correct. Unbalance
and power measurement are valid.
Useq
321
Voltage sequence is reverse. Unbalance
and power measurement are
compromised.
Switch voltage leads U
2
and U
3
in-
between to obtain right
sequence.
Useq
-
Phase angle between voltages is not 120
0
± 30
0
. Unbalance and power
measurement are compromised.
Check voltage leads, and check if
selected Connection correspond
to the actual network.
Iseq
123
Current sequence is correct, phase angle
between currents is less than 120
0
± 60
0
.
Unbalance and power measurement are
valid.
Iseq
123
Current sequence is correct, but phase
angle between currents is more than 120
0
± 60
0
.
This is valid situation if there are
large inductive/capacitive load in
the network. However, this can
be also caused by improper
Содержание MI 2885
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