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  • Electronic Relays_Motor protection_Function chart

Motor Protection Relays function chart


PROTECTION
PRESETTING
INDICATION
FUNCTION
RESETTING
Tripping
Alarm
Automatic
Manual
Thermal
Iq %
S4..S8
Steady
Middle
x
x
x
-
overload
light
LED
-overload
Upper
-start-up current
t6 / s
potentiom.
Under current
OFF/ON
S2
Steady
Middle
x
x
x
x
Iq %
(S4...S8)
flash
LED
Unbalance
Iq %
(S4...S8)
Irregular
Middle
x
x
x
x
-phase interrupt
flash
LED
-single phase
-incorrect phase
sequence
Earth fault
Iq / In
Lower
Steady
Lower
%
potentiom.
light
LED
Alarm
S3
-
x
-
x
Trip
S3
x
x
x
x
Selfsupervision
-
-
-
-
-
x
Self
Self
Internal fault
resetting
resetting
Fail safe
Upper
operation
-
-
“OK” OFF
LED
x
-
-
-
Failure of
auxiliary voltage

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