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incorrect, and the total active power is negative, the reverse active energy, not
the forward active energy, will be accumulated.
The problem happening most frequently on site is that the input or output
wires are connected reversely, which will cause the phase active power to be
negative. Besides, the wrong phase sequence will also lead to incorrect
display of electric energy.
The display is blank
Make sure appropriate auxiliary power supply is provided for the meter, for
the auxiliary power supply with voltage beyond the stipulated range may
damage the meter absolutely. The voltage of auxiliary power supply can be
measured by multimeter. If it turns out to be correct, and the meter displays
nothing, please try electrifying the meter once again.
7 Technical specifications
7.1 AHM3-SMTP
Electric Characteristics
Accuracy
Voltage and current
0.2%
Power,Power Factor
0.5%
Frequency
±0.01Hz
Active power
IEC62053-22, class 0.5S
Reactive power
IEC62053-23, class 2
Data update rate
1s
Input
Wiring mode
1P2W
、
1P3W
、
3P3W
、
3P4W
Voltage
Rated value
400 VAC L-N (690 VAC L-L)
Overload
1.2Vln
Impedance
>1MΩ
Current
Rated value
1A or 5A
Overload
Continuous: 1.2In
Instantaneous: 10In/5s
burden
<0.1VA
Impedance
<20mΩ
Grid frequency
(45
～
65)Hz
Auxiliary
supply
Working range
AC/DC
（
80
～
270
）
V
consumption
≤ 10VA
Energy pulse output
2 photocouple outputs, pulse width (80±20%) ms
