18
2.
Current reverse, no current, under current, over current, low current, high current, etc.
Channel alarm and trip judgment preconditions:
a.
They need to meet their alarm conditions.
b.
At the same time, if the cumulative number of alarm channels is greater than
the set number of trip channels, tripping will occur.
c.
Confirm whether the corresponding trip register is on or off by default.
Alarm message
•
Undercurrent alarm. After the channel average current value is subtracted from the
overcurrent / undercurrent alarm threshold, the current value is still less than or equal to
the current channel start alarm start threshold. The overcurrent / undercurrent alarm
threshold will change as the average current changes.
Alarm message
•
Over current alarm. After the channel average current value plus the over current / under
current alarm threshold, the current value is still greater than or equal to the current
channel start alarm start threshold. The over current / under current alarm threshold will
change as the average current changes.
Alarm message
•
Low current alarm, when the current is less than or equal to the channel current low alarm
threshold, an alarm occurs.
Alarm message
•
High current alarm. When the current is greater than or equal to the channel current high
alarm threshold, an alarm occurs.
Alarm message
•
No current alarm, when the absolute value of the current is less than 250mA, an alarm
occurs.
Alarm message
Arc Alarm Strategy
The following arc strategies are designed according to the latest arc standards of UL1699B:
1. If the arc intensity of any channel exceeds the channel alarm threshold (threshold can be set,
default 70), a channel arc alarm will be generated;
2. In the trip mode (DC voltage at o ± terminal is 0v), the arc of any channel exceeds the alarm
threshold, the arc alarms and trips the circuit breaker. After the trip, the alarm status of the alarm
interface must be manually or remotely cleared. restore;
3. In relay mode (DC voltage at o ± terminal is 24v), the arc of any channel exceeds the alarm
threshold, o ± voltage becomes 0v for 3 minutes (time can be set), and o ± voltage returns to
24v after 3 minutes; if the same Channel alarm 5 times (number of times can be set), o ±
voltage is no longer restored, and it cannot be restored after power failure. You must manually
or remotely clear the alarm status of the alarm interface to return to normal;
4. Accumulation method of channel arc times: The arc alarm times are only +1 if continuous arc
occurs on the same channel. For example, if the first channel has 3 consecutive arc alarms, the
fourth is the second channel alarm, the number of alarms is reset, and if the second channel
has another alarm, the second channel alarm number is +1. After reaching 5 alarms, you must
manually Clear the alarm interface.
