X-OUT
Ox4
Ox1
K4
K3
out
V+
1
in
2
Activating the brakes by the control system
1
Modulation
2
Safety circuit
X-OUT
Ox4
Ox1
K3
K4
out
V+
1
2
Activating the brakes by the frequency inverter and control system
1
Modulation
2
Safety circuit
CAUTION!
Caution!
Brakes, which are connected to the direct current side, must be protected against excess voltage from
the switching actions by using corresponding varistors!
Due to the high operating current, master contactors must be used to switch the brakes!
U
Y
~
-
+
~
N
L
K3
3 4
K3
1 2
K4
1 2
Simpli
fi
ed diagram for brake activation
The contacts from K3 must close before the contact from K4 and are only permitted to open after the
contact from K4 has opened.
5.21.4
Integrated brake contactors (optional)
In frequency inverters type ZETADYN 3C for synchronous motors the contactors for switching the
motor brakes can be integrated optionally in the frequency converter.
CAUTION!
Caution!
The different operating voltages of the converters must be observed!
Original operating instructions
ZETADYN 3C
Electrical installation
R-TBA08_03-GB 1619
Part.-No. 00163322-GB
45/204
