Maintenance - Grundfos CRN MAGdrive Bedienungsanleitung

5. Type key
Example
Type range
3
Rated flow rate in m /h
Number of impellers
Code for pump version
M: CRN pump with magnetic drive
Code for pipe connection
CA: FlexiClamp
CX: TriClamp
F: DIN flange
G: ANSI flange
J: JIS flange
P: PJE coupling
Code for materials
G: Wetted parts EN 1.4401/AISI 316
Code for rubber parts of pump
E: EPDM
®
F: FXM (Fluoraz )
®
K: FFKM (Kalrez )
®
V: FKM (Viton )
See also the installation and operating instructions of CR, CRI,
CRN.
6. Mechanical installation
Warning
Installation and operation must comply with local
regulations and accepted codes of good practice.
Before installation, check that
• the pump and its components are as ordered.
• no visible parts have been damaged.
6.1 Installation of pump
The pump must be installed and put into operation as described
in the installation and operating instructions of CR, CRI, CRN.
It is advisable to protect CRN MAGdrive pumps against dry
running by installing a flow switch, pressure switch or a LiqTec
sensor close to the pump. The delay of the dry-running protection
must be maximum 15 seconds.
6.2 Connection of sensor
A pressure sensor or a Grundfos LiqTec dry-running protection
can be fitted in the threaded hole in the pump head.
Description
Threaded connection:
Max. installation length, sensor:
7. Electrical connection
The pump must be installed as described in the installation and
operating instructions of CR, CRI, CRN.
Pumps with 2-pole motors of 18.5 and 22 kW and 4 pole-motors
as from 1.1 kW must be started via a soft starter.
7.1 Motor protection
As minimum the motor must be connected to an effective
electronic motor protection with instantaneous release when the
maximum setting of the current is reached. If a soft starter or a
frequency converter is used it must also be with instantaneous
release.
In order to ensure the optimum protection of the MAGdrive motor,
the motor protection should be set in accordance with the
following guidelines:
1. Set the overload protection to the rated full-load current (I
of the motor.
CRN 5 -13 -M -F -G -E
Dimension
RG 1/2
20 mm
1/1
2. Start the pump and let it run for half an hour at the required
duty point.
3. Measure the motor current. If not possible slowly grade down
the scale indicator until the motor trip point is reached.
4. The setting of the motor protection must be 5 % higher than
this value.
The highest permissible setting of the motor protection is the
rated full load current (I
8. Start-up
Do not start the pump until it has been filled with
Note
liquid and vented.
1. Open the isolating valve on the suction side of the pump.
2. Close the isolating valve on the discharge side of the pump.
3. Loosen the air vent screw in the pump head.
4. Slowly fill the pump with liquid.
5. Tighten the air vent screw when the pump has been
completely filled with liquid.
6. Slowly open the isolating valve on the discharge side of the
pump.
7. Start the pump.
8. Check the direction of rotation by means of the motor fan and
the label on top of the fan cover.
9. After start-up, the pump should be vented again.
Slowly loosen the air vent screw in the pump head.
Warning
Pay attention to the direction of the vent hole to
ensure that the escaping liquid does not cause
injury to persons or damage to the motor or other
components.
10.When liquid starts running out, tighten the air vent screw
securely.

9. Maintenance

The pump requires no maintenance if is has been installed
according to the instructions.
10. Fault finding
See the installation and operating instructions of CR, CRI, CRN.
11. Service
Warning
The pump contains powerful magnets that may
pose a risk of personal injury when servicing the
pump. The pump should therefore only be
dismantled and assembled by authorised
personnel.
If Grundfos is requested to service such a pump, we must be
contacted with details about the pumped liquid, etc. before the
pump is returned for service. Otherwise we can refuse to accept
the pump for service.
Possible costs of returning the pump are paid by the customer.
11.1 Other documentation
Service and other documentation for CR pumps can be found at
www.grundfos.com > International website > WebCAPS - pump
curves/catalogue/product finder.
If you have any questions, please contact the nearest Grundfos
company or service workshop.
12. Disposal
This product or parts of it must be disposed of in an
environmentally sound way:
1. Use the public or private waste collection service.
)
2. If this is not possible, contact the nearest Grundfos company
or service workshop.
) of the motor.
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Subject to alterations.
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