Eng
lish (US)
28
13.5 Bus connection cable
13.5.1 New installations
For the bus connection, use a screened 3-core cable with a
conductor cross-section of 28-16 AWG.
• 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.
20
, leave the
screen unconnected at this end.
Fig. 20
Connection with screened 3-core cable
13.5.2 Replacing an existing pump
• If a screened 2-core cable is used in the existing installation,
connect it as shown in fig.
21
.
Fig. 21
Connection with screened 2-core cable
• If a screened 3-core cable is used in the existing installation,
follow the instructions in section
13.5.1 New installations
.
14. Modes
Grundfos E-pumps are set and controlled according to operating
and control modes.
14.1 Overview of modes
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.
14.2 Operating mode
When the operating mode is set to Normal, the control mode can
be set to controlled or uncontrolled. See section
14.3 Control
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
22
is a schematic illustration of minimum and maximum
curves.
Fig. 22
Minimum and maximum curves
The maximum curve can for instance be used in connection with
the venting procedure during installation.
The minimum 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 Grundfos GO and R100 offer additional possibilities of
setting and status displays. See section
17. Setting by means of
R100
for setting by means of R100. See section
17.6 Grundfos
GO Remote
for setting by means of Grundfos GO.
TM
02 88
41 090
4
TM
0
2
8
8
42
0
9
04
A
Y
B
A
Y
B
1
2
3
1
2
3
Pump
A
Y
B
A
Y
B
1
2
1
2
Pump
Operating modes
Normal
Stop
Min.
Max.
Control modes
Uncontrolled
Controlled
Constant
curve
Constant
pressure
1)
TM
00
55
47
09
95
Q
H
Max.
Min.
