Grundfos TPE - Cabling and Connections

English (GB)
15
5.5 Signal cables
• Use screened cables with a cross-sectional area of min.
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. 11.
Fig. 11 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.
5.6 Bus connection cable
5.6.1 New installations
For the bus connection, use a screened 3-core cable with a
cross-sectional area of min. 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. 12, leave the
screen unconnected at this end.
Fig. 12 Connection with screened 3-core cable
5.6.2 Replacing an existing motor
• If a screened 2-core cable is used in the existing installation,
connect the cable as shown in fig. 13.
Fig. 13 Connection with screened 2-core cable
• If a screened 3-core cable is used in the existing installation,
follow the instructions in section 5.6.1 New installations.
6. Operating conditions
6.1 Maximum number of starts and stops
The number of starts and stops via the power supply must not
exceed four times per hour.
When switched on via the power supply, the pump will start after
approx. 5 seconds.
If a higher number of starts and stops is desired, use the input for
external start/stop when starting/stopping the pump.
When started via an external on/off switch, the pump will start
immediately.
6.2 Alternating operation of twin-head pumps
On twin-head pumps, the duty and back-up pumps should be
alternated on a regular basis, i.e. once a week, to ensure an even
distribution of the operating hours on both pumps. As default, the
pumps alternate automatically. See section 11.1
Setup of
multi-pump system
.
If twin-head pumps are used for pumping domestic hot water, the
duty and back-up pumps should be alternated on a regular basis,
i.e. once a day, to avoid blocking of the back-up pump due to
deposits (calcareous deposits, etc.). As default, the pumps
alternate automatically. See section 11.1
Setup of multi-pump
system
.
6.3 Ambient temperature
6.3.1 Ambient temperature during storage and transportation
-30 to +60 °C.
6.3.2 Ambient temperature during operation
-20 to +50 °C.
The motor can operate with the rated power output (P2) at 50 °C,
but continuous operation at higher temperatures will reduce the
expected product life. If the motor is to operate at ambient
temperatures between 50 and 60 °C, an oversized motor must be
selected. Contact Grundfos for further information.
TM02 1325 4402 TM05 3973 1812TM02 8842 0904
A
Y
B
A
Y
B
1
2
3
1
2
3
Motor
A
Y
B
A
Y
B
1
2
1
2
Motor