Grundfos CRE User Manual

11.1.4 Humidity
Maximum humidity: 95 %.
If the humidity is constantly high and above 85 %, open the drain
holes in the drive-end flange. See the sections on outdoor
installation and drain holes.
Related information
5.6 Outdoor installation
5.6 Installation extérieure
5.6 Instalación en exteriores
5.7 Drain holes
5.7 Drain holes
5.7 Drain holes
11.1.5 Motor cooling
To ensure cooling of motor and electronics, observe the following:
• Position the motor in such a way that adequate cooling is
ensured. See the section on ensuring motor cooling.
• The temperature of the cooling air must not exceed 122°F
(50°C).
• Keep cooling fins and fan blades clean.
Related information
5.5 Ensuring motor cooling
11.2 Megging
Do not meg an installation incorporating MLE motors, as the built-in
electronics may be damaged.
11.3 Technical data, single-phase motors
11.3.1 Supply voltage
• 1 × 200-240 V -10 % / +10 %, 50/60 Hz, PE.
Check that the supply voltage and frequency correspond to the
values stated on the nameplate.
Recommended fuse size
Motor size
Hp [kW]
Minimum
[A]
Maximum
[A]
0.33 - 1 (0.25 - 0.75) 6 10
1 1/2 - 2 (1.1 - 1.5) 10 16
You can use standard as well as quick-blow or slow-blow fuses.
11.3.2
Leakage current
Ground leakage current less than 3.5 mA, AC.
Ground leakage current less than 10 mA, DC.
The leakage currents are measured in accordance with EN
61800-5-1:2007.
11.4 Technical data, three-phase motors
11.4.1 Supply voltage
• 3 × 440-480 V -10 % / +10 %, 50/60 Hz, PE.
Check that the supply voltage and frequency correspond to the
values stated on the nameplate.
Recommended fuse size
Motor size
[Hp (kW)]
Minimum
[A]
Maximum
[A]
0.33 - 1 1/2 (0.25 - 1.1) 6 6
2 (1.5) 6 10
3 (2.2) 6 16
5 (4) 13 16
7 1/2 (5.5) 16 32
10 (7.5) 20 32
15 (11) 32 32
Standard as well as quick-blow or slow-blow fuses may be used.
• 3 × 200-240 V, 60 Hz (supply voltage V)
Recommended fuse size
Motor size
[Hp (kW)]
Minimum
[A]
Maximum
[A]
1 1/2 (1.1) 10 20
2 (1.5) 10 20
3 (2.2) 13 35
5 (4) 25 35
7 1/2 (5.5) 32 35
11.4.2 Leakage current (AC)
Speed
[min
-1
]
Power
[Hp (kW)]
Power supply
voltage
[V]
Leakage
current
[mA]
2900-4000
0.33 - 3
(0.25 - 2.2)
≤ 400 < 3.5
> 400 < 5
5 - 7 1/2
(4 - 5 1/2)
≤ 400 < 3.5
> 400 < 3.5
10 - 15
(7 1/2 - 11)
≤ 400 < 3.5
> 400 < 5
4000-5900
0.33 - 3
(0.25 - 2.2)
≤ 400 < 3.5
> 400 < 5
5 - 7 1/2
(4 - 5.5)
≤ 400 < 3.5
> 400 < 3.5
10-15
(7.5 - 11)
≤ 400 < 3.5
> 400 < 5
The leakage currents are measured in accordance with EN
61800-5-1:2007.
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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