Mains pro 1.6.1 Global Guide
26
underfrequency - related trips
LOM: counter of Loss-of-Mains - related
trips (Vector shift and ROCOF)
Otr: counter of trips with other reason than
the above mentioned: External trip,
voltage asymmetry, phase sequence or
inverse phase polarity
Time measurement screen:
Operation Time: time since MainsPro was
powered up*
Last Trip Time: time of the latest trip since
MainsPro was powered-up
Please note that the time information on the
MainsPro unit is not measured by a calibrated
RTC device and may serve for orientation
purposes only. Find more in Technical data
(page 45).
Trip history screen
List of last five trips - contains reason of the
trip and time since the unit was powered up
Note:
*For case of power cut off, the time stamp is stored and after the unit is powered up again, the timer will start
from the from following second after the last stored one.
4.5 Alarm messages
One of these indications appears on the homepage screen in case of the unit trip. It indicates the first protective
stage, which issued the trip event:
f> Overfrequency, 1st stage
f>> Overfrequency, 2nd stage
f< Underfrequency, 1st stage
f<< Underfrequency, 2nd stage
U> Overvoltage, 1st stage
U>> Overvoltage, 2nd stage
U< Undervoltage, 1st stage
U<< Undervoltage, 2nd stage
Vs Vector shift
RCF ROCOF
Vunb Voltage (amplitude) unbalance
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