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7 Connection examples
7.3 Size 3 and 4 (41 – 200 A)
142
DS7 Soft starter 09/16 MN03901001Z-EN www.eaton.com
L1
L2
L3
N
PE
Q1
F3
PE
Q2
Q11
Q13
I> I> I>
M
M1
3 ~
Figure 111: Power section, motor cascade
F3 = Superfast semiconductor fuse for type 2 coordination, in addition to Q1 (optional)
Q1 = cable protection through circuit-breaker or fuse (F1)
Q2 = Soft starter DS7
Qn1 = Contactor (1, 2, n)
Qn2 = Supply bypass contactor for motor (1, 2, n)
Qn3 = Motor protection (motor-protective circuit-breaker
or current transformer-operated overload relay)
Mn = Motor (1, 2, n)
￫
The control system shown here can also be used for the DS7
soft starters in size 2 (16 to 32 A).
￫
The "thermal motor protection" (Q13, Q23, Qn3) can also be
ensured with current transformer-operated overload relays
(see ￫ section 2.11.7, "Parallel motor connection", page 46).
Q12
Q21
Q23
I> I> I>
M
M2
3 ~
Q22
Qn1
Qn3
I> I> I>
M
Mn
3 ~
Qn2
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