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with PT or CT, relevant pulse data 5000 corresponds to primary side energy data
1kWh×voltage ratio PT × current ratio CT.
C. Application example
：
the pulse counting device is used for PLC terminal.
Supposing during the period with the length of t, the number of collected pulse is
N; the input of meter is 10kV/100V, 400A/5A, thus the accumulated energy of
meter during this period is N/5000×100×80 degrees of energy.
6.2 Digital input
Meter supports two digital inputs. Input signal is AC220V.
There are three working modes for digital inputs:
a. Status monitoring: meter receives the status of terminal contact point and shows
it on front panel. The changing of status will be shown immediately.
b. Spare energy: terminal status is synchronous signal. Spare energy metering starts
when the signal is received, meanwhile, basic energy metering stops.
6.3 Relay output
This device provides two relay outputs.
The relay output has two different work modes: alarm mode and remote control
mode. Work mode, alarm item and alarm range of each relay output can be set in
programming operation.
Remark: the format of alarm range data is secondary grid integer data. Specific
format refers to the following table. (“H” indicate high alarm, while “L” indicates
low alarm)
Summary of Contents for Sfere720A
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