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Overcurrent Alarm and Overcurrent Warning
Overcurrent warning and overcurrent alarm is applicable to phase current I
1
, I
2
, and I
3
only.
The overcurrent alerts are enabled if the system current exceeds the user-defined setting (I
max
Alarm/I
max
Warning) and persists for a user-defined time (overcurrent alarm time/overcurrent warning time).
The overcurrent warning and overcurrent alarm resets when the current falls below the threshold with a
hysteresis of 5 % of rated primary current. For example, if the warning threshold is set to 500 A, the device
resets the alert if the current falls below 485 A for a rated primary current of 300 A (15 A is 5 % of 300 A).
For more information about the overcurrent alarm and overcurrent warning, see
and refer to the
Fault Parameters > Overcurrent Warning and Overcurrent Alarm menu.
i
i
NOTE
Configure the overcurrent threshold for current settings (I
max
Alarm/I
max
Warning) such that the difference
between the 2 settings is at least 10 % of the rated primary current to display an appropriate alert for an
alarm or warning.
i
i
NOTE
Configure the overvoltage threshold for voltages (V
max
Alarm/V
max
Warning) and the undervoltage
threshold for voltages (V
min
Alarm/V
min
Warning) such that the difference between the 2 settings is at least
2 % of the rated primary voltage to display an appropriate alert for an alarm or warning.
i
i
NOTE
If you set the threshold for an undervoltage alarm (V
min
Alarm), undervoltage warning (V
min
Warning), over-
voltage alarm (V
max
Alarm), and overvoltage warning (V
max
Warning) closer to the primary voltage and if a
frequency change occurs (> 0.2 Hz), a false indication of the undervoltage alarm, undervoltage warning,
overvoltage alarm, and overvoltage warning can occur.
i
i
NOTE
The overvoltage alarm/warning resets after a delay of 10 s when the voltage falls below the configured
threshold. The undervoltage alarm/warning resets after a delay of 10 s when the voltages are above the
configured threshold or below 50 % of the primary voltage.
Archive Logging
An archive log is composed of:
•
Event logs
The device stores 20 faults as event logs on the non-volatile memory. The event logs consists of time
stamps and fault current values. The event log is designed as a ring buffer where the new fault always
overwrite the oldest stored event.
Due to the watchdog timer reset, the Device Error Event is also saved. For the device error event, in
Modbus the Current values are shown as 0. In HMI, the message Device error watchdog timer reset is
displayed without showing the phase-current values.
•
Trailing pointers
The minimum and maximum values of current are archived every 15 minutes, 30 minutes, 45 minutes, 1
hour, 24 hours, 1 month, and 1 year.
For more information about the parameters of archive logging, see
and refer to the Events and
Trailing Pointers menus.
4.1.38
Device Functions
4.1 Description
58
SICAM, Feeder Condition Monitor, Manual
E50417-H8940-C580-A4, Edition 03.2019
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