Maintenance And Service; Cleaning Of The Motor; Relubrication Of Motor Bearings; Replacement Of Motor Bearings - Grundfos E Serie Instrucciones De Instalación Y Funcionamiento

18. Maintenance and service

18.1 Cleaning of the motor

Keep the motor cooling fins and fan blades clean to ensure
sufficient cooling of the motor and electronics.

18.2 Relubrication of motor bearings

Pumps up to 7.5 kW
The motor bearings are of the closed type and greased for life.
The bearings cannot be relubricated.
Pumps of 11-22 kW
The motor bearings are of the open type and must be relubricated
regularly.
The motor bearings are pre-lubricated on delivery. The built-in
bearing monitoring function will give a warning indication on the
R100 when the motor bearings are due to be relubricated.
Before relubrication, remove the bottom plug in the
motor flange and the plug in the bearing cover to
Note
ensure that old and excess grease can escape.
Frame size
Drive end
MGE 160
MGE 180
When relubricating the first time, use the double quantity of
grease as the lubricating channel is still empty.
The recommended grease type is a polycarbamide-based
lubricating grease.

18.3 Replacement of motor bearings

Three-phase motors have built-in bearing monitoring function
which will give a warning indication on the R100 when the motor
bearings are due to be replaced.

18.4 Replacement of varistor (only 11-22 kW)

The varistor protects the pump against mains voltage transients.
If voltage transients occur, the varistor will be worn over time and
need to be replaced. The more transients, the more quickly the
varistor will be worn. When it is time to replace the varistor, R100
and PC Tool E-products will indicate this as a warning.
A Grundfos technician is required for replacement of the varistor.
Contact your local Grundfos company for assistance.

18.5 Service parts and service kits

For further information on service parts and service kits, visit
www.Grundfos.com, select country, select WebCAPS.
28
Quantity of grease
[ml]
Non-drive end
13 13
15 15

19. Technical data - single-phase pumps

19.1 Supply voltage

1 x 200-240 V - 10 %/+ 10 %, 50/60 Hz - 2 %/+ 2 %, PE.
Recommended fuse size
Motor sizes up to 1.1 kW: Max. 10 A.
Standard as well as quick-blow or slow-blow fuses may be used.

19.2 Overload protection

The overload protection of the E-motor has the same
characteristic as an ordinary motor protector. As an example, the
E-motor can stand an overload of 110 % of I

19.3 Leakage current

Earth leakage current < 3.5 mA.
The leakage currents are measured in accordance with EN
61800-5-1.

19.4 Inputs/outputs

Start/stop
External potential-free contact.
Voltage: 5 VDC.
Current: < 5 mA.
2
Screened cable: 0.5 - 1.5 mm
Digital
External potential-free contact.
Voltage: 5 VDC.
Current: < 5 mA.
2
Screened cable: 0.5 - 1.5 mm
Setpoint signals
• Potentiometer
0-10 VDC, 10 kΩ (via internal voltage supply).
Screened cable: 0.5 - 1.5 mm
Maximum cable length: 100 m.
• Voltage signal
0-10 VDC, R > 50 kΩ.
i
Tolerance: + 0 %/- 3 % at maximum voltage signal.
Screened cable: 0.5 - 1.5 mm
Maximum cable length: 500 m.
• Current signal
= 175 Ω.
DC 0-20 mA/4-20 mA, R
i
Tolerance: + 0 %/- 3 % at maximum current signal.
Screened cable: 0.5 - 1.5 mm
Maximum cable length: 500 m.
Sensor signals
• Voltage signal
0-10 VDC, R > 50 kΩ (via internal voltage supply).
i
Tolerance: + 0 %/- 3 % at maximum voltage signal.
Screened cable: 0.5 - 1.5 mm
Maximum cable length: 500 m.
• Current signal
= 175 Ω.
DC 0-20 mA/4-20 mA, R
i
Tolerance: + 0 %/- 3 % at maximum current signal.
Screened cable: 0.5 - 1.5 mm
Maximum cable length: 500 m.
Internal power supplies
• 10 V power supply for external potentiometer:
Max. load: 2.5 mA.
Short-circuit-protected.
• 24 V power supply for sensors:
Max. load: 40 mA.
Short-circuit-protected.
Signal relay output
Potential-free changeover contact.
Maximum contact load: 250 VAC, 2 A, cos φ 0.3 - 1.
Minimum contact load: 5 VDC, 10 mA.
2
Screened cable: 0.5 - 2.5 mm
Maximum cable length: 500 m.
for 1 min.
nom
/ 28-16 AWG.
/ 28-16 AWG.
2
/ 28-16 AWG.
2
/ 28-16 AWG.
2
/ 28-16 AWG.
2
/ 28-16 AWG.
2
/ 28-16 AWG.
/ 28-12 AWG.