Grundfos MGE 71 Service Instructions

English (GB)
3
English (GB) Service instructions
Original service instructions.
CONTENTS
Page
1. Symbols used in this document
2. General information
These service instructions apply to MGE 71, MGE 80 and
MGE 90, models H and I.
Position numbers of parts (digits) refer to drawings and parts lists;
position numbers of tools (letters) refer to section 5. Service
tools.
Electrical parts must only be serviced by Grundfos or an
authorised service workshop.
Before dismantling
• Close the isolating valves, if fitted, and make sure that they
cannot be accidentally opened.
• Before starting work on the product, let the product and
pumped liquid cool off.
During assembly
• Lubricate and tighten screws and nuts according to
section 3. Torques and 4. Secondary materials.
After assembly
• If analog or digital inputs, the relay output or the CIM module
has been removed from the functional module, you must
check the communication with external units after service. See
section 7.14 Configuring the controller.
3. Torques
* Screws of new terminal boxes must be tightened to 7-8 Nm.
1. Symbols used in this document
3
2. General information
3
3. Torques
3
4. Secondary materials
4
5. Service tools
4
6. Megging
5
7. Replacing hardware
5
7.1 Replacing the terminal box cover
5
7.2 Replacing the battery
5
7.3 Fitting the antenna
5
7.4 Replacing the control panel
5
7.5 Replacing the CIM module
6
7.6 Replacing the isolation cover
7
7.7 Replacing the functional module
7
7.8 Replacing the power module
7
7.9 Replacing the terminal box
8
7.10 Replacing the stator housing
8
7.11 Replacing the fan
8
7.12 Replacing the bearings
8
7.13 Replacing IP55 seal rings with IP66 rings
9
7.14 Configuring the controller
10
8. Fault finding
14
8.1 General information
14
8.2 Fault indications
15
8.3 Functional module
17
8.4 Power module
20
8.5 Winding resistance
23
9. Exploded view
25
10. Disposal
26
Warning
Prior to service work, read these service
instructions carefully. Installation and service
work must comply with local regulations and
accepted codes of good practice.
Observe the safety instructions in the installation
and operating instructions for the product.
Warning
If these safety instructions are not observed,
it may result in personal injury.
Warning
If these instructions are not observed, it may lead
to electric shock with consequent risk of serious
personal injury or death.
Warning
The surface of the product may be so hot that
it may cause burns or personal injury.
Caution
If these safety instructions are not observed,
it may result in malfunction or damage to the
equipment.
Note
Notes or instructions that make the job easier
and ensure safe operation.
Note
The installation and operating instructions for
this product and for the system which it is part of
must be available during service of the product.
Warning
Use personal protective equipment if there is a
risk of getting into contact with the pumped
liquid.
Observe local regulations.
Warning
Switch off the power supply and make sure that it
cannot be accidentally switched on. The power
supply must be switched off for at least five
minutes before you start working on the motor.
Check that other pumps or sources do not force
flow through the pump even if the pump is
stopped. This will cause the motor to act like a
generator, resulting in voltage on the terminals.
Pos. Designation Type
Dimensions
[mm]
Torque
[Nm]
152
Torx screw
Tx25 12 x M5 3.5 - 4
178 Tx30 16/10 x 60 5 - 6*
185 Tx30 16 x M6 5 - 6
192 Tx30 14 x 6 5 - 6*
251d Tx25 50 x M5 5 - 6*
268 Tx 25 12 x M5 3.5 - 4
273a Tx20 32 x M4 1 - 1.3
277a Tx20 32 x M4 1 - 1.3
286 Tx40 21 x M7 2.2 - 2.7
288a Tx20 M4 1 - 1.3
289a Tx30 14 x 6 5 - 6
291 Union M20 M20 x 1.5 1 - 1.3

Grundfos MGE 71 Specifications

General

Brand	Grundfos
Model	MGE 71
Category	Water Pump
Language	English