Grundfos CRE Instructions

4.6 Bus connection cable
4.6.1 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 the figure below,
leave the screen unconnected at this end.
A
Y
B
A
Y
B
1
2
3
1
2
3
P
TM028841
Connection with screened 3-core cable
Pos. Description
P Pump
4.6.2 Replacing an existing pump
• If a screened 2-core cable is used in the existing installation,
connect it as shown in figure below.
A
Y
B
A
Y
B
1
2
1
2
P
TM028842
Connection with screened 2-core cable
Pos. Description
P Pump
• If a screened 3-core cable is used in the existing installation,
follow the instructions in the section on new installations.
Related information
4.6.1 New installations
4.6.1 Nouvelles installations
4.6.1 Instalaciones nuevas
4.7
Modes
Grundfos E-pumps are set and controlled according to operating
and control modes.
4.7.1
Overview of modes
Operating modes Normal — Stop — Min — Max
|
Control modes Uncontrolled — Controlled
| |
Constant
curve
Constant pressure
1)
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.
4.7.2 Operating mode
When the operating mode is set to Normal, the control mode can be
set to controlled or uncontrolled. See the section on 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.
The figure below is a schematic illustration of min. and max. curves.
Q
H
Max.
Min.
TM005547
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 the section on setting by means of R100.
Related information
4.7.3 Control mode
6.5 Setting by means of R100
11
English (US)

Grundfos CRE Specifications

General

Protection Class	IP55
Material	Stainless Steel
Applications	Water supply, pressure boosting, irrigation
Impeller Material	Stainless Steel
Pump Housing Material	Stainless Steel
Connection Size	DN32 to DN200 (depending on model)
Power Supply	3-phase
Control	Integrated frequency converter