Grundfos TPE3 - Signal and bus cables; Startup; Flushing the pipe system; Priming

English (US)
16
9.5 Signal cables
• Use screened cables with a cross-sectional area of
min. 20 AWG and max. 16 AWG (0.5 mm
2
and max. 1.5 mm
2
)
for external on/off switch, digital inputs, setpoint and sensor
signals.
• Connect the screens of the cables to frame at both ends with
good connection. The screens must be as close as possible to
the terminals. See fig. 23.
Fig. 23 Stripped cable with screen and wire connections
• Screws for frame connections must always be tightened
whether a cable is fitted or not.
• The wires in the motor terminal box must be as short as
possible.
9.6 Bus connection cable
9.6.1 New installations
For the bus connection, use a screened 3-core cable with a
cross-sectional area of min. 20 AWG and max. 16 AWG (0.5 mm
2
and max. 1.5 mm
2
).
• If the motor is connected to a unit with a cable clamp which is
identical to the one on the motor, connect the screen to this
cable clamp.
• If the unit has no cable clamp as shown in fig. 24, leave the
screen unconnected at this end.
Fig. 24 Connection with screened 3-core cable
9.6.2 Replacing an existing motor
• If a screened 2-core cable is used in the existing installation,
connect the cable as shown in fig. 25.
Fig. 25 Connection with screened 2-core cable
• If a screened 3-core cable is used in the existing installation,
follow the instructions in section 9.6.1 New installations.
10. Startup
10.1 Flushing the pipe system
10.2 Priming
Closed systems or open systems where the liquid level is
above the pump inlet
1. Close the discharge isolating valve and loosen the air vent
screw in the motor stool. See fig. 26.
2. Slowly open the isolating valve in the suction pipe until a
steady stream of liquid runs out of the vent hole.
3. Tighten the air vent screw and completely open the isolating
valve(s).
TM02 1325 4402 TM05 3973 1812
A
Y
B
A
Y
B
1
2
3
1
2
3
Motor
TM02 8842 0904
Caution
The pump is not designed to pump liquids
containing solid particles such as pipe debris
and welding slag. Before starting up the pump,
clean the pipe system thoroughly, and flush and
fill it with clean water.
The warranty does not cover any damage caused
by flushing the pipe system by means of the
pump.
Caution
Do not start the pump until it has been filled with
liquid and vented. To ensure correct venting, the
vent screw should point upwards.
Warning
Pay attention to the direction of the vent hole,
and make sure that the escaping hot or cold
liquid does not cause injury to persons or
damage to the equipment.
A
Y
B
A
Y
B
1
2
1
2
Motor