ABB ACS 400 User Manual page 156

Figure 69 Operation Diagram for the Pump and Fan Control (PFC) Macro. With the default settings,
automatic pump alternation is not in use.
Figure 70 In this example the automatic pump alternation is in use.
146
3 ~
ACS 400
Process Act. Value
Process Ref. Value
+24 V supply
DI5 (Interlock 2)
DI4 (Interlock 1)
RO2
Pump 2
On/Off
+24 V d.c. ~230 V a.c.
3 ~
ACS 400
Process Act. Value
Process Ref. Value
+24 V supply
DI5 (Interlock 2)
DI4 (Interlock 1)
RO2
~230VAC ~230VAC
Alternation Switchgear
Mains Supply
Input Power
~ ~
PI
~ ~
RO1
Pump 1
On/Off
Pump 1
Regulated speed
M
3~
Constant speed
Mains Supply
Input Power
~ ~
PI
~ ~
RO1
Pump 1
On/Off
Pump 2
On/Off
M
M
3~
3~
Pump 2
M
3~
ACS 400 User's Manual