19
English (US)
15.5 Bus connection cable
15.5.1 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.
16
, leave the
screen unconnected at this end.
Fig. 16
Connection with screened 3-core cable
15.5.2 Replacing an existing pump
• If a screened 2-core cable is used in the existing installation,
connect it as shown in fig.
17
.
Fig. 17
Connection with screened 2-core cable
• If a screened 3-core cable is used in the existing installation,
follow the instructions in section
15.5.1 New installations
on
page
19
.
16. Modes
Grundfos E-pumps are set and controlled according to operating
and control modes.
16.1 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.
16.2 Operating mode
When the operating mode is set to Normal, the control mode can
be set to controlled or uncontrolled. See section
16.3 Control
mode
on page
20
.
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
18
is a schematic illustration of min. and max. curves.
Fig. 18
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 Grundfos GO and R100 offers additional possibilities of
setting and status displays. See section
19. Setting by means of
R100
on page
21
and
33
.
TM
02
8
8
4
1
090
4
TM
0
2
8
842
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)
T
M
00
5
5
4
7
09
95
Q
H
Max.
Min.
Summary of Contents for VLSE
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