Vacon NX Series Applications Manual page 171

PUMP AND FAN CONTROL APPLICATION
230 VAC
24 VDC
12
22
23
A
Mains
O
S1
K3
K2 K3
K2
K1.1 K1
K1 K1.1
M1/Vacon M1/mains
Fig. 22: Pump autochange system, principal control diagram
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VACON OPT-A1
DIN2
9
25
VACON OPT-B5
26
A
Mains
O
S2
K3
K1 K3
K1
K2.1 K2
K2 K2.1
M2/Vacon M2/mains
VACON OPT-A1
DIN3
10
VACON OPT-B5 28
29
Mains
A
O
S3
K1
K2 K1
K2
K3.1 K3
K3 K3.1
M3/Vacon M3/mains
VACON · 171
VACON OPT-A1
DIN4
14
7