EAAM057608EN
GC250 Technical Manual 139
2. Load working time with GCB closed (hours) counter (resettable to zero) Total active
power meter (kWh), with power measured when the loads are connected to the
generator; it measures only the supplied power and does not measure in case of
power reverse.
3. Partial reactive power meter (kvarh) (resettable), with power measured when the loads
are connected to the generator: it measures the absolute value.
4. Total reactive power meter (kvarh), with power measured when the loads are
connected to the generator: it measures the absolute value.
5. Engine starts counter (resettable to zero).
6. Partial engine running hours counter (resettable to zero).
7. Total counter of the controller supplying hours
8. Counter for the total engine running hours left to maintenance.
9. Load working time with GCB closed (hours) counter (resettable to zero)
10. Controller total power supply time (hours) counter
Almost all these counters and meters are displayed on the controller's front panel (only the
total supply time counter is not displayed). However, all can be read via the serial port (with
the ModBus protocol). Some of these counters can be reset by the operator following a proper
pr
ocedure, or via the serial port (they are marked in the list with “resettable to zero”). All these
counters are saved in a non-volatile memory; therefore they store their values also when the
controller is powered off. Since non-
volatile memories “consume” themselves writing in them,
it is necessary to reduce at the minimum the number of writings. For this reason, a counter is
not immediately saved as its value changes, and it is then important to know when values are
saved and how to be sure that they are saved before removing supply from the board.
Counters are saved (all together and in the same time) in the following conditions:
Immediately after each engine start (with engine running, not after each start attempt).
Immediately after each engine stop (when controller acknowledges the engine
stopped status, not when stop is requested).
After each engine running hours counter increase (total, also if the engine has been
started for instance six times for ten minutes each time).
After each total engine running hours counter increase (total, also if the engine has
been started for instance six times for ten minutes each time).
Each time the load engine working hours counter is increased (total, also if the engine
has been started for instance six times for ten minutes each time).
Each time the operating mode is switched to
OFF_RESET
.
For each hour the controller is powered.
When parameter P.0424 is changed (maintenance interval).
Furthermore, counters are saved when they are reset to zero (individually or globally) via front
panel or serial port. Note that some counters have a decimal part (for example the minutes-
counters associated to hours-counters), which is also saved in a non-volatile memory.
Powering off the controller in an uncontrolled way can cause the loss of the decimal part. It is
enough to switch the controller to OFF-RESET to force data saving, before switching off the
power.
11.6.1
Counters reset
The resetting procedure is common for all the counters, but it only applies to some of them,
based on the page displayed on the multifunctional display. See in paragraph 7.4.8.3 the
description of the display page that contains the counter to be reset to zero.
