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2 Functions
Supervision
Voltage failure, 3-phase External (power system or
connection)
Trip Circuit Monitoring
external (trip circuit or
control voltage)
1)
after three unsuccessful restarts, the device is taken out of service.
2)
DOK = „Device OK" = Break contact of the readiness relay = Life contact
2.15.1.6 Setting Notes
General
The sensitivity of the measured value monitoring can be changed. Experiential values
set ex works are adequate in most cases. If particularly high operational asymmetries
of the currents and/or voltages are expected, or if one or more monitoring functions
pick up sporadically during normal operation, the sensitivity setting(s) should be re-
duced.
The measurement supervision can be switched ON or OFF in address 2901
MEASURE. SUPERV.
Address 2902 BALANCE U-LIMIT determines the limit voltage (phase-to-phase),
Current balance
above which the voltage symmetry monitoring is effective. Address 2903 BAL.
supervision
FACTOR U is the associated balance factor, i.e. the gradient of the balance character-
istic. The indication „Fail U balance" (no. 167) can be delayed at address 2908
T BAL. U LIMIT. These settings can only be changed using DIGSI at Additional
Settings.
Address 2904 BALANCE I LIMIT determines the limit current above which the
current symmetry monitoring is effective. Address 2905 BAL. FACTOR I is the as-
sociated balance factor, i.e. the gradient of the balance characteristic. The indication
„Fail I balance" (no. 163) can be delayed at address 2909 T BAL. I LIMIT.
These settings can only be changed using DIGSI at Additional Settings.
Address 2906 ΣI THRESHOLD determines the limit current above which the current
Summated current
sum monitoring is activated (absolute portion, only relative to I
supervision
(relative to the maximum phase current) for activating the current sum monitoring is
set at address 2907 ΣI FACTOR. These settings can only be changed using DIGSI
at Additional Settings.
Note
Current sum monitoring can operate properly only when the ground current of the pro-
tected line is fed to the fourth current measuring input (I
former must have been configured as In prot. line via parameter I4
transformer (220).
212
Possible Causes
Malfunction Response
Indication
Undervoltage protection
blocked,
Frequency protection
blocked
Message
Indication (No.)
Device
„Fail U absent" (168) As allocated
„FAIL: Trip cir."
as allocated
(6865)
). The relative portion
N
) of the relay. The I
4
7SD610 Manual
C53000-G1176-C145-4
trans-
4
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