Schneider Electric 4000

63230-300-212 Chapter6—Alarms

April 2001 Set point-Controlled Relay Functions

Thissection describes some common motor management functionsto which

the followinginformation applies:

•Valuesthat are too large to fit into the display may require scalefactors.

For more informationon scale factors, refer to “Changing ScaleFactors”

on page 191 in Appendix B—Usingthe Command Interface.

•Relayscan be configured as normal, latched, ortimed. See “Relay Output

OperatingModes”on page 75 in Chapter 5—Input/Output Capabilities

for more infor mation.

•When the alarm occurs,the circuit monitor operates any specified relays.

There are two waysto release relays that are in latched mode:

—Issue a commandto de-energize a relay. See Appendix B—Using

the Command Interface on page 181 forinstructions on using the

command interface,or

—Acknowledgethe alarm in the high priority log to release the relays

from latchedmode. From the main menu of the display,select View

Alarms> High Priority Log to view and acknowledge unacknowledged

alarms. See “Viewing Alarms”on page 41 for detailed instructions.

The list that followsshows the types of alarms available for some common

motor managementfunctions:

NOTE: Voltagebase alarm setpoints depend on your system configuration.Alarm setpoi nts for 3-wire systems are V L-Lvalues while 4-wire systems areVL-N values.

Undervoltage:

Pickup and dropoutsetpoints are entered in volts. The per-phase

undervoltagealarm occurs when the per-phase voltage is equal to or below

the pickupsetpoint long enough to satisfy the specified pickup delay(in

seconds). The undervoltagealarm clears when the phase voltage remains

abovethe dropout setpoint for the specified dropout delay period.

Overvoltage:

Pickupand dropout setpoints are enteredin volts. The per-phase overvoltage

alarm occurs when the per-phasevoltage is equal to or above the pickup

setpoint longenough to satisfy the specified pickup delay (in seconds).The

overvoltagealarm clears when the phase voltage remainsbelow the dropout

setpoint forthe specified dropout delay period.

Unbalance Current:

Pickupand dropout setpoints are entered in tenths of percent, based on the

percentage differencebetween each phase current with respect to the

averageof all phase currents. For example,enter an unbalance of 7% as 70.

The unbalance currentalarm occurs when the phase current deviates from

theaverage of the phase currents, bythe percentage pickup setpoint,for the

specifiedpi ckupdelay. The alarm clears when the percentagedifference

betweenthe phase current and the average of all phases remainsbelow the

dropout setpointfor the specified dropout delay period.

Typesof Setpoint-Controlled

Relay Functions