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TOSHIBA
6F9E0090
(b)
When undercurrent or disconnection is detected
At the
sale
time the
lain
circuit switch is turned
OH,
the
starting current and rated current flows, and the relay is
picked UP. If current
drODS
below the undercurrent set point,
the undercurrent State is detected and the relay
drops
out.
(Refer to Fig. 5)
Caution:
If input signal to this current relay is zero (When
StoDDed).
it is not possible to judge if it is undercurrent or in a
disconnected state. In this case, it is recommended to
have a circuit connecting a
normally
oDen
auxiliary con-
tact of the
Dain
circuit switch in series with the
alara
or
IauD
circuit. this will Drevent the relay fror
signalling
a
fault condition during a
normal
shutdown.
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15-