
Masterpact™ NT and NW Universal Power Circuit Breakers
Micrologic™ Electronic Trip Systems
29
05/2014
© 2000–2014 Schneider Electric
All Rights Reserved
Trip and Alarm Histories
The last ten trips and ten alarms are recorded in two separate history files that can be displayed on the
screen (sample displays are shown to the right). The following information is contained in these files:
Table 29: Load-Shedding Settings for Current and Power Metering for Micrologic 5.0P and
6.0P Trip Units
Pick-Up Drop-Out
Threshold Time Delay Threshold Time Delay
Current I 0.5 to 1.0 x I
r
per phase 20% to 80% x t
r
0.3 to 1.0 x I
r
per phase 10 to 600 s
Power P 200 kW to 10 MW 10 to 3600 s 100 kW to 10 MW 10 to 3600 s
Trip History
•
Type of fault
•
Date and time of fault
•
Interrupted current
•
Contact wear
Alarm History
•
Type of alarm
•
Date and time of the alarm
•
Values measured at the time of the
alarm
Tr ip
05 / 20 / 00
Ii 7200 A
10:23:42 am
I
a
=
I
b
=
I
c
=
I
n
=
7800 A
7800 A
7800 A
7800 A
Tr i p
Ii
Ii
Vmin
05 / 20 / 00
04 / 28 / 00
04 / 28 / 00
history
Al
Al
Al
Trip
05 / 20 / 00
996A
Al
Alarm
05 / 20 / 00
04 / 28 / 00
02 / 28 / 00
history
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