Signal Cables; Bus Connection Cable; Modes; Overview Of Modes - Grundfos CRE Montage- Und Betriebsanleitung

5.3 Signal cables

• Use screened cables with a conductor cross-section of min.
2 2
0.5 mm and max. 1.5 mm
input, setpoint and sensor signals.
• Connect the screens of the cables to frame at both ends with
good frame connection. The screens must be as close as
possible to the terminals. See fig. 11.
Fig. 11 Stripped cable with screen and wire connection
• Always tighten screws for frame connections whether a cable
is fitted or not.
• Make the wires in the pump terminal box as short as possible.

5.4 Bus connection cable

5.4.1 New installations
For the bus connection, use a screened 3-core cable with a
conductor cross-section of 0.2 mm
• If the pump is connected to a unit with a cable clamp which is
identical to the one on the pump, 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.
A
1
2
Y
3
B
Fig. 12 Connection with screened 3-core cable
5.4.2 Replacing an existing pump
• If a screened 2-core cable is used in the existing installation,
connect it as shown in fig. 13.
A
1
Y
2
B
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
12
for external on/off switch, digital
2 2
- 1.5 mm .
Pump
A
1
2
Y
3
B
Pump
A
1
Y
2
B
5.4.1 New installations.

6. Modes

Grundfos E-pumps are set and controlled according to operating
and control modes.

6.1 Overview of modes

Operating modes Normal
Control modes Uncontrolled
Constant
curve
1)
For this control mode the pump is equipped with a pressure
sensor. The pump may also be equipped with a temperature
sensor in which case the description would be constant
temperature in control mode controlled.

6.2 Operating mode

When the operating mode is set to Normal, the control mode can
be set to controlled or uncontrolled. See section
mode.
The other operating modes that can be selected are Stop, Min. or
Max.
• Stop: the pump has been stopped
• Min.: the pump is operating at its minimum speed
• Max.: the pump is operating at its maximum speed.
Figure 14 is a schematic illustration of min. and max. curves.
H
Min.
Fig. 14 Min. and max. curves
The max. curve can for instance be used in connection with the
venting procedure during installation.
The min. curve can be used in periods in which a minimum flow is
required.
If the power supply to the pump is disconnected, the mode setting
will be stored.
The remote control R100 offers additional possibilities of setting
and status displays. See section
Stop Min. Max.
Controlled
Constant
1)
pressure
6.3 Control
Max.
Q
9. Setting by means of R100.