Eaton DS7 - Actuation of Resistive Loads

2 Engineering
2.11 Motor connection
44 DS7 Soft starter 09/16 MN03901001Z-EN www.eaton.com
2.11.4 Actuation of resistive loads
DS7 soft starters can also be used to drive resistive loads (example: electrical
heating elements).
Figure 27: Impermissible connection for resistive loads
Q1 = Cable and cable
protection
Q21 = Soft starter
Q31 = Motor contactor
F3 = optional
semiconductor fuse for
type of coordination 2,
R = Resistive load
①
Delta circuit
②
Star connection
Figure 26: Connecting resistive loads in a wye or delta circuit
￫
Do not use the soft starters to drive solidly grounded wye circuit
resistive loads, as a phase will be connected directly to the
mains voltage in this case!
1L1 3L2 5L3
PE
PE
TOR
- A2 EN + A1 13 14 2423
2T1 4T2 6T3
L1
L2
L3
PE
Q1
Q21
①②
F3
I > I > I >
Q1
RUN
- U
s
+ U
s
(+) U
s
24 V AC/DC, 120/230 V AC
(–) U
s
L1 L3
L1 L3
L2
L2
T1 T2
T3