Insulation Resistance; Maintenance And Service; Cleaning Of The Motor; Relubrication Of Motor Bearings - Grundfos CRIE Installation And Operating Instrictions

19. Insulation resistance

1.5 - 10 hp
Do not measure the insulation resistance of
Caution
motor windings or an installation incorporating
E-pumps using high voltage megging equipment,
as this may damage the built-in electronics.
15-30 hp
Do not measure the insulation resistance of an
installation incorporating E-pumps using high
voltage megging equipment, as this may damage
Caution
the built-in electronics.
The motor leads can be disconnected separately
and the insulation resistance of the motor
windings can be tested.

20. Maintenance and service

20.1 Cleaning of the motor

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

20.2 Relubrication of motor bearings

1.5 - 10 hp pumps
The motor bearings are of the closed type and greased for life.
The bearings cannot be relubricated.
15-30 hp pumps
The motor bearings are of the open type and must be relubricated
regularly. The motor bearings are prelubricated 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
Note
Note
cover to ensure that old and excess grease can
escape.
When relubricating the first time, use the double quantity of
grease as the lubricating channel is still empty.
Frame size
Drive end
(DE)
MLE 160 .44
MLE 180 .51
The recommended grease type is a polycarbamide-based
lubricating grease.

20.3 Replacement of motor bearings

15-30 hp 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.

20.4 Replacement of varistor (only 15-30 hp)

The varistor protects the pump against 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.
Quantity of grease
[ounces]
Non-drive end
(NDE)
.44
.51

20.5 Service parts and service kits

For further information on service parts and service kits, visit
www.Grundfos.com, select country, select WebCAPS.
21. Technical data - three-phase pumps,
1.5 - 10 hp

21.1 Supply voltage

3 x 460-480 V - 10 %/+ 10 %, 50/60 Hz - 2 %/+ 2 %, PE.
3 x 208-230 V - 10 %/+ 10 %, 50/60 Hz - 2 %/+ 2 %, PE.
2
Cable: Max 10 mm / 8 AWG.
Use min. 158 °F (70 °C) copper conductors only.
Recommended fuse sizes
Motor sizes from 1.5 - 7.5 hp: Max. 16 A.
Motor size 10 hp: Max. 32 A.
Standard as well as quick-blow or slow-blow fuses may be used.

21.2 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

21.3 Leakage current

Motor size
[hp]
1-3 hp (supply voltage < 460 V)
1-3 hp (supply voltage > 460 V)
5 to 7.5 hp
10 hp
The leakage currents are measured in accordance with
EN 61800-5-1.

21.4 Inputs/output

Start/stop
External potential-free contact.
Voltage: 5 VDC.
Current: < 5 mA.
2
Screened cable: 0.5 - 1.5 mm / 28-16 AWG.
Digital
External potential-free contact.
Voltage: 5 VDC.
Current: < 5 mA.
2
Screened cable: 0.5 - 1.5 mm / 28-16 AWG.
Setpoint signals
• Potentiometer
0-10 VDC, 10 kΩ (via internal voltage supply).
Screened cable: 0.5 - 1.5 mm
Maximum cable length: 328 ft.
• 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: 1640 ft.
• 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: 1640 ft.
for 1 min.
nom
Leakage current
[mA]
< 3.5
< 5
< 5
< 10
2
/ 28-16 AWG.
2
/ 28-16 AWG.
2
/ 28-16 AWG.
31