Danfoss VLT AQUA Drive FC 202

8.11 Wiring Conguration for a Cascade
Controller
Illustration 8.6 shows an example with the built-in basic
cascade controller with 1 variable-speed pump (lead) and 2
xed-speed pumps, a 4–20 mA transmitter, and system
safety interlock.
Power Card
MOTOR MAINS
RELAY 1
(cascade
pump 1.)
RELAY 2
(cascade
pump 2.)
+24V OUT + 24V OUT
(Start)
(Safety Interlock)
(Feedback 1 res.)
Control Card
System
Start/
Stop
From Motor Control Circuitry
System
Safety
Interlock
Pressure
Transmitter
4-20 mA,
L1
L2
L3
PE
N
130BA378.10
P
24 V dc
12 13 18 19 27 29 32 33 20 39 42 50 53 54 55
COM D IN D IN 1 D IN1 D IN1/D OUT D IN1/D OUT D IN 1 D IN 1 A IN2 A OUT1 COM A OUT + 10V OUT A IN1 COM A IN
96
U
97
V
98
W
PE
91
L1
92
L2
93
L3
01 02 03 04 05 06
MMM
Illustration 8.6 Cascade Controller Wiring Diagram
Wiring Conguration Exampl... VLT® AQUA Drive FC 202
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