Xylem Flygt FGC 421 - 7.2 Connect a an external contactor for a 3-phase pump motor; 7.3 Connect the float switches

7.2 Connect a an external contactor for a 3–phase pump
motor
P2 SENSOR
L1
AC~
L2 L3
PE
DO 1
NO COM NO COM
DO 3
NO COM NC
+
24V OUT
T1 T2
P1 SENSOR
T1 T2 +
DI 1
+
MUTE
H
P2 H/O/A
O
RS485
+ IN
AI 1
STOP
FLO AT SWITCHES
STBY
+
ALARM 24V
H
P1 H/O/A
O
HIGH
1
2
3 4
HMI
5
DO 2
RS232
N
USB
A B GND
DUTY
DO 4
NO OM
DO 5
NO OM
+
P1 CT
+
P2 CT
WS009665A
1 2
1. Pump 1
2. Pump 2
Connect the contactor coil to the terminals NO and COM for each pump.
7.3 Connect the float switches
P2 SENSOR
L1
AC~
L2 L3
PE
DO 1
NO COM NO COM
DO 3
NO COM NC
+
24V OUT
T1 T2
P1 SENSOR
T1 T2 +
DI 1
+
MUTE
H
P2 H/O/A
O
RS485
+ IN
AI 1
STOP
FLO AT SWITCHES
STBY
+
ALARM 24V
H
P1 H/O/A
O
HIGH
1
2
3 4
HMI
5
DO 2
RS232
N
USB
A B GND
DUTY
WS009656A
1 2 3 4 5
Connect the float switches according to the table.
An additional float switch can be connected via the general-purpose digital
input.
Number Terminal Description
1 STOP Stop level switch
2 DUTY Start level switch for the duty pump
3 − Common terminal for all float switches
4 STBY Start level switch for the stand-by pump
5 HIGH High-level switch
7 Electrical Installation
20 Flygt FGC 400 Installation, Operation, and Maintenance