Sonel MPI-540 - Page 38

MPI-540 – USER MANUAL
36
Additional information displayed by the meter
The meter is ready for measurement.
Measurement in progress.
U
L-N
voltage is incorrect for making a measurement.
U
L-PE
voltage is incorrect for making a measurement.
U
N-PE
voltage exceeds allowable value of 50 V.
Phase connected to N terminal instead of L terminal (for
example, exchange of L and N in the mains socket).
Maximum temperature inside the meter is exceeded.
Network frequency is outside the range of 45...65 Hz.
Error during the measurement. Correct result cannot be
displayed.
Loop circuit mal-
function!
The meter should be serviced.
and continuous au-
dio signal
Before measurement, voltage at test terminals exceeds
500 V.
The voltage on the tested object is not within the limits
specified for the set rated voltage of the network U
n
(sec-
tion 2.2.1 step ).
Too low value of the prospective short circuit current I
k
for
the pre-set security and time of its triggering.