MCS301 - 3ph meter Page 56 of 142
MCS301 meter - product Manual 1.25 MetCom Solutions GmbH
o Exhaust of power reserve
Table 19 shows the situation when a long power down event leads to a
discharged power reserve and therefore to an invalid clock. The power down
event starts on 12.08.2016 at 21:16 and ends on 30.08.2016 at 08:43. The
power-down is too long to keep the real time clock running with the supercap,
the power reserve is exhausted. After power up (30.08. at 08:43), profile
entries continue with the time set to the first capture time after the power down
(12.08. at 21:30) – with the PDN=1, DNV=1 and CIV=1. Capturing continues
using the invalid clock and keeping CIV=1 and DNV=1 until the clock is set.
Date/Time Internal Clock
… ….
30.08. 08:45 12.08. 21:30
30.08. 09:00 12.08. 21:45
30.08. 09:15 12.08. 22:00
30.08. 09:30 13.08. 22:15
…. ….
Assuming 3 hours and 50 min after power up the clock is set to 30.8.2016,
12:35, the next regular entry will take place at 30.8.2016 at 12:45. Since the
entry does not represent a full capture period the CAD flag will be set to 1.
Date/Time Internal Clock
… …
30.08. 12:35 30.08. / 12:35
30.08. 12:45 30.08. / 12:45
… …
The entry at 13.8.2016, 22:30 is stored as if time was advanced over the end
of the next period i.e. CAD and DNV are set to 1. Additionally due to the fact
power reserve is exhausted also CIV is set to 1.
Date/time
Register value
2016-08-12, 21:15:00 0 0 0 0 110,2kW
2016-08-12, 21:30:00 1 0 1 1 123,4kW
2016-08-12, 21:45:00 0 0 1 1 146,2kW
2016-08-12, 22:00:00 0 0 1 1 172,1kW
2016-08-12, 22:15:00 0 0 1 1 176,3kW
2016-08-12, 22:30:00 0 1 1 1 181,9kW
2016-08-30, 12:45:00 0 1 0 0 182,2kW
2016-08-30, 13:00:00 0 0 0 0 187,3kW
Table 19: Exhaust of power reserve – late clock adjustment
If the time adjustment occurs before the end of the 1st capture period after a
power-up, the generated entries are additionally marked with the PDN flag.
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