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9.4 Timer
MainsPro G99TT provides two time counters: since the unit power-up and since the last
these timers for investigation of failures that were detected by MainsPro G99TT unit. Please note that
MainsPro G99TT does not provide RTC clock and after each power-up of the unit, the time and date is lost.
For this reason only indication of days / hh : mm is used. The accuracy of the time measurementhas been
tested and a measurement error of 4 seconds per 24 hours was observed.
9.5 Start trip
The unit supports start into the
setpoint
Start Trip (page
immediately after the auxiliary power supply is turned on. If there are no failures detected it is possible to
perform
Fault reset (page 32)
operation. If the setpoint is set to DISABLED, the unit goes directly into the fail-free state.
The purpose of this functionality is to allow automatic delayed return to mains in case that the mains is
completely lost and MainsPro G99TT unit is powered from the same mains voltage.
9.6 TEST mode
MainsPro G99TT provides a TEST mode, which enables phase-to-phase testing of 3-phase protective
features by single-phase power source.
The test mode may be activated by entering the init screen (entered by pressing the ENTER and ESC at
the same time). Follow by ← button and then ↑ button. This will open the Test mode activation screen.
Select Y to enter the TEST mode.
The voltage asymmetry protections are deactivated.
The following functions are fix-assigned to the appropriate relay outputs, regardless of their actual
assignment:
Comm Trp Per to RE3
f Sig to RE4
U Sig to RE5
In TEST mode, the setpoint group TEST becomes visible. This group contains only one setpoint –
„Phase". Use this setpoint to assign to which input is the 1-phase measurement voltage source connected
(U
, U
or U
).
A
B
C
All relevant protections are evaluated only in that phase, which is selected:
If TEST/Phase = Ua, the following protective functions are evaluated:
Overvoltage and undervoltage on the UA terminals, with dual stage setting, including the Alt
parameters possibility
Overfrequency and underfrequency on the UA terminals, with dual stage setting, including the Alt
parameters possibility
Loss OF Mains protections on the UA terminals, with the Alt parameters possibility
If TEST/Phase = Ub or Uc, the following protective functions are evaluated:
Overvoltage and undervoltage on the appropriate terminals, with dual stage setting, including the
Alt parameters possibility
MainsPro G99TT 1.0.0 Global Guide
TRIP (page 31)
state after connection of the power supply based on the
55). If this setpoint is set to ENABLED, the unit goes into the TRIP state
by any of the aforementioned means and so to put the unit into fault-free
TRIP (page
31). Use
42
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