Toshiba Current Relay RC803A-HP1 User Manual

Page 16

T O S H I B A

When undercurrent or disconnection is detected

At the

time the

circuit switch is turned

the

starting current and rated current flows, and the relay is

picked U

If current

below the undercurrent set point,

the undercurrent State is detected and the relay

out.

(Refer to Fig. 5)

Caution:

If input signal to this current relay is zero (When

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

auxiliary con-

tact of the

circuit switch in series with the

c i r c u i t .

t h i s w i l l D r e v e n t t h e r e l a y f r o r

fault condition during a

shutdown.