Liebert LDM user manual Alarms, Alarm conditions and factory setpoints

Operation

5.1Alarms

The Liebert LDM constantly monitors configured parameters for normal values. When the unit detects an alarm condition, it annunciates and displays alarm messages via the Monitor program (see 5.4 - Using the Monitor Tool).

Alarms must be manually reset after the alarm condition has been corrected and may be reset through Modbus.

To facilitate troubleshooting:

•All alarms are stored in non-volatile memory to protect against erasure by a power outage.

•Alarms are saved in an event log. The event log stores up to 128 events using a first-in, first-out format (FIFO).

All alarm thresholds for monitored parameters are adjustable by using the Configuration tool to match site requirements (see 5.5 - Using the Configuration Tool).

Table 6 shows the types of alarms for the various types of breakers, along with a description, factory default setpoints and allowable range for each.

Table 6		Alarm conditions and factory setpoints
		Alarm	Description	Default setting	Range
Branch Breakers
•	Overcurrent Warning		Current exceeds 75% of breaker amps	15A	0-75%
•	Overcurrent Alarm		Current exceeds 80% of breaker amps	16A	10-80%
				0%, which
•	Low Current Alarm		Minimum current level of a branch breaker	disables	0-70%
				the alarm
Panelboard Main Breaker and SqD I-Line Panelboard
•	Phase Overcurrent Warning		Current exceeds 75% of breaker amps	170A	0-75%
•	Phase Overcurrent Alarm		Current exceeds 80% of breaker amps	180A	10-80%
•	Neutral Overcurrent Alarm		Current exceeds 95% of breaker amps	214A	10-200%
•	Ground Overcurrent Alarm		Current exceeds 5 amps	5A	1-50A
•	Overvoltage Alarm		At least one of the line-to-line voltages exceeds +6% of	—	0-50%
			nominal
•	Undervoltage Alarm		At least one of the line-to-line or line-to-neutral voltages	—	0-50%
			falls below -13% of nominal
Subfeed Breakers and I-Line Output Breakers
•	Phase Overcurrent Warning		Current exceeds 75% of breaker amps	170A	0-75%
•	Phase Overcurrent Alarm		Current exceeds 80% of breaker amps	180A	10-80%
				0%, which
•	Low Current Warning		Minimum current level of a branch breaker	disables	0-70%
				the alarm
•	Neutral Overcurrent Alarm		Current exceeds 95% of breaker amps	214A	10-200%
•	Ground Overcurrent Alarm		Current exceeds 5 amps	5A	1-50A
Summary Alarm			Detects and annunciates upon occurrence of any alarm	—	—
Panelboard Summary Alarm			Detects and annunciates upon occurrence of branch or	—	—
			panelboard main breaker alarm

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