Operation
3ZX1012-0RB12-1AA1
15
En
glis
h
4
Operation
4.1
Setting the current
■
Use the current setting range knob to set the
appropriate current.
4.2
Adjust tripping classes
Note
The motor, leads and contactor must be rated for the
appropriate class. Class 10 as delivered.
■
Check the class setting before initial start-up and
correct it if necessary!
■
Use the class changeover switch to select the appro-
priate tripping characteristic (see graphic section of
Fig.
VII
).
In the event of unsymmetry > 40 % (as per NEMA) and
phase failure, tripping occurs as shown in Fig.
VIII
. The
characteristics apply to a cold start. For starting under full
load, the tripping times t
A
are reduced.
Note
With the aid of the sealable cover plate 3RB1900-0A,
the current range setting knob and the class changeover
switch can be protected from tampering. To do this,
simply snap on the cover plate instead of the middle
nameplate.
