ABB ACS 400 - Page 169

158 ACS 400 User’s Manual
Figure 63 Operation Diagram for the Pump and Fan Control (PFC) Macro. With the default settings,
automatic pump alternation is not in use.
Figure 64 In this example the automatic pump alternation is in use.
Process Act. Value
Process Ref. Value
DI5 (Interlock 2)
DI4 (Interlock 1)
RO2
RO1
~
~
~
~
M
3~
+24 V d.c.
Input Power
PI
ACS 400
Pump 1
Regulated speed
Pump 2
Constant speed
~230 V a.c.
M
3~
Mains Supply
3 ~
+24 V supply
Pump 2
On/Off
Pump 1
On/Off
Process Act. Value
Process Ref. Value
DI5 (Interlock 2)
DI4 (Interlock 1)
RO2
RO1
~
~
~
~
M
3~
Input Power
PI
ACS 400
~230VAC
M
3~
Mains Supply
3 ~
+24 V supply
Pump 2
On/Off
Pump 1
On/Off
~230VAC
Alternation Switchgear
http://nicontrols.com