Eaton DS7 Series, Manual

Page: 143 / 240

7 Connection examples
7.3 Size 3 and 4 (41 – 200 A)
DS7 Soft starter 09/16 MN03901001Z-EN www.eaton.com
139
7.3.7 Bypass circuit for emergency operation
In pump applications the bypass circuit is often required to provide emergency
operation capability. A service switch (key switch) is used to select the bypass
circuit between soft starter operation and DOL starter operation. This is used to
fully isolate the soft starter.
In this case, it is important that the output circuit is not opened during operation.
The interlocks in the controller ensure that a switchover is only possible after a
stop.
Figure 109: Actuation with bypass emergency operation – pump operation
The electrical and/or mechanical interlocking of contactors Q22 and Q31 ensures
safe operating states.
￫
Devices of the DS7-34… series are equipped with integrated
bypass contacts. External bypass contacts are therefore not
required for standard operation.
￫
Unlike the simple bypass operation, in this case the bypass
contactor must be designed in accordance with utilization
category AC-3. For a suitable contactor, see our recommended
mains contactor in the Appendix (
￫ page 221).
a Enable
b Automatic operation (soft starter)
c Manual/bypass operation
d Soft starter/Soft stop
e Bypass contactor
S1 = Operating mode selector switches
S2 = Off
S3 = On
S4 = Stop (Soft starter)
S5 = Start (Soft starter)
A1
A2
K5
S5 K5 K5
S4
13
14
K4 Q22
TOR K2
Q31 Q11
K3 K4
K3
EN
A2
Q21
K1
S3
K1
K1 K2
S2
K2
K1
K4
K3
S1
K2
Q22
Q31
23
24
RUN
Q21
Q21
d e c b a
L00/L-
L01/L+