1SDH002031A1002 ECN000092998 Rev. B
SACE Tmax XT2
– XT4 | 99
Maintenance
The
Measurements-Maintenance
menu includes some information on the status of the CB.
Contact wear
Contact wear indicates an estimate of the state of deterioration of the main contacts of the circuit
breaker. The value is expressed in percentage value, and is 0% in the event of no wear and
100% in the event of complete wear.
It is automatically calculated by the Trip unit at each opening due to protection, or, if there is an
auxiliary power supply, also at each manual opening of the circuit breaker.
NOTES:
Upon reaching 100%, the percentage does not increase any further
The achievement of 80% is signaled with a pre-alarm, while the achievement of
100% is signaled with an alarm
IMPORTANT: 100% wear does not imply any functional limit on the Trip unit, but
it is necessary to check the status of the circuit breaker as soon as possible
Maintenance
The
Maintenance
function allows notifying the user with a Warning alarm that:
One year has passed since the last maintenance
Contact wear increased by more than 10% compared to the last maintenance value
Two areas are available in Trip unit menus:
Activation area (
Settings - Maintenance
menu): allows activating the
Maintenance
function
Measurements and reset area (
Measurements - Maintenance
menu): appears only if the
Maintenance
function is activated. Provides information on the maintenance (contact wear
and dates) and the command to confirm the maintenance (confirming the current date and
contact wear values are recorded, and the alarm signal is reset).
The date of reference is that of the internal clock, and the elapsed time is calculated whether the
trip unit is on or off (as long as the internal battery is working).
NOTE: manually changing the date may cause changes in the calculation of the
elapsed time, and therefore also of the next maintenance date
NOTE: the indication of maintenance due to increased contact wear is active for values
exceeding 20%
Counter
operations
CB operations (total of manual operations and TRIPs) are recorded by the Trip unit with an
auxiliary power supply and available in the
Information-Circuit Breaker
menu.
By activating communication with the Trip unit the following counters are also available:
Number of manual operations
Number of openings due to trips (TRIP)
Number of openings due to failed trips
Number of opening tests performed
Summary of Contents for SACE Tmax XT2
Page 84: ...1SDH002031A1002 ECN000092998 Rev B SACE Tmax XT2 XT4 84 L curve Ekip M Touch S curve t k I2 ...
Page 86: ...1SDH002031A1002 ECN000092998 Rev B SACE Tmax XT2 XT4 86 G curve t k I2 G curve t k ...
Page 87: ...1SDH002031A1002 ECN000092998 Rev B SACE Tmax XT2 XT4 87 IU curve UV curve UV2 curve ...
Page 88: ...1SDH002031A1002 ECN000092998 Rev B SACE Tmax XT2 XT4 88 OV curve OV2 curve VU curve ...
Page 89: ...1SDH002031A1002 ECN000092998 Rev B SACE Tmax XT2 XT4 89 S V curve S2 V curve RV curve ...
Page 90: ...1SDH002031A1002 ECN000092998 Rev B SACE Tmax XT2 XT4 90 UF curve UF2 curve OF curve OF2 curve ...
Page 91: ...1SDH002031A1002 ECN000092998 Rev B SACE Tmax XT2 XT4 91 RP curve D curve ...
Page 92: ...1SDH002031A1002 ECN000092998 Rev B SACE Tmax XT2 XT4 92 OQ curve OP curve ...
Page 93: ...1SDH002031A1002 ECN000092998 Rev B SACE Tmax XT2 XT4 93 UP curve RQ curve ...
Page 94: ...1SDH002031A1002 ECN000092998 Rev B SACE Tmax XT2 XT4 94 ROCOF curve R JAM curve R STALL ...
Page 95: ...1SDH002031A1002 ECN000092998 Rev B SACE Tmax XT2 XT4 95 UC curve ...
