Install Instructions

9
English (US)
6.5 Signal cables
• Use screened cables with a cross-sectional area of min.
AWG 20 (0.5 mm
2
) and max. AWG 16 (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. 10.
Fig. 10 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.
6.6 Bus connection cable
6.6.1 New installations
For the bus connection, use a screened 3-core cable with a
cross-sectional area of min. AWG 20 (0.5 mm
2
) and max.
AWG 16 (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. 11, leave the
screen unconnected at this end.
Fig. 11 Connection with screened 3-core cable
6.6.2 Replacing an existing motor
• If a screened 2-core cable is used in the existing installation,
connect the cable as shown in fig. 12.
Fig. 12 Connection with screened 2-core cable
• If a screened 3-core cable is used in the existing installation,
follow the instructions in section 6.6.1 New installations.
7. Operating conditions
7.1 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.
7.2 Ambient temperature
7.2.1 Ambient temperature during storage and transportation
-22 - +140 °F (-30 - +60 °C).
7.2.2 Ambient temperature during operation
-4 - +122 °F (-20 - +50 °C).
The motor can operate with the rated power output (P2) at 122 °F
(50 °C), but continuous operation at higher temperatures will
reduce the expected product life. If the motor is to operate at
ambient temperatures between 122 and 140 °F (50 and 60 °C),
an oversized motor must be selected. Contact Grundfos for
further information.
TM02 1325 4402 TM05 3973 1812
A
Y
B
A
Y
B
1
2
3
1
2
3
Motor
TM02 8842 0904
A
Y
B
A
Y
B
1
2
1
2
Motor