13. Fault finding
WARNING
Electric shock
Death or serious personal injury
‐ Switch off the power supply before you start any work
on the product.
‐ Make sure that the power supply cannot be switched
on accidentally.
For information on fault finding, see the related installation
and operating instructions for the pump.
Related information
2.1 Related instructions
7.11 Signal relays
9.6 Grundfos Eye
14. Technical data
14.1 Operating conditions
14.1.1 Installation altitude
The installation altitude is the height above sea level of the
installation site.
Products installed up to 3280 ft (1000 m) above sea level can be
loaded 100 %.
The motors can be installed up to 11480 ft (3500 m) above sea
level.
Products installed more than 3280 ft (1000 m) above sea
level must not be fully loaded due to the low density and
consequent low cooling effect of the air.
The motor output power (P2) in relation to the altitude above sea
level is shown in the graph.
50
60
70
80
90
100
[%]
P2
3280 7380 11480
1000
[ft]
[m]2250 3500
TM059218
Pos.
Description
P2 Motor output power [%]
X Altitude [ft] and [m]
14.1.2 Maximum number of starts and stops
The number of starts and stops via the power supply must not
exceed ten times per hour.
When switched on via the power supply, the product starts
after approximately 5 seconds.
If a higher number of start and stops are required, use a digital input
for external start and stop when starting and stopping the product or
use the Safe Torque Off (STO) function.
When started via an external on and off switch, the
product starts immediately.
14.1.3 Ambient temperature
14.1.3.1 Ambient temperature during storage and
transportation
Description Temperature
Minimum -22 °F (-30 °C)
Maximum 140 °F (60 °C)
14.1.3.2 Ambient temperature during operation
Model K
Description 3 × 440-480 V
Minimum -4 °F (-20 °C)
Maximum
122 °F (50 °C)
13)
13)
35 HP MLE motors are rated for a maximum value of 104 °F (40 °C).
14.1.4 Humidity
Description Percentage
Maximum humidity (non-condensing) 95 %
If the humidity is constantly high and above 85 %, open the drain
holes in the drive-end flange to vent the motor.
If you install the motor in moist surroundings or areas with
high humidity, ensure that the bottom drain hole is open.
As a result, the motor becomes self-venting, allowing
water and humid air to escape. When you open the drain
hole, the enclosure class of the motor will be lower than
standard.
14.1.5 Pollution degree
The product is approved for Pollution degree 3 rating.
14.1.6
Turbine operation
Do not force the product to run at a higher speed than the
maximum speed stated on the nameplate.
14.2 Technical data, three-phase motors
WARNING
Electric shock
Death or serious personal injury
‐ Use the recommended fuse size.
Supply voltage
• 3 × 440-480 V -10 % / +10 %, 60 Hz, PE
Check that the supply voltage and frequency correspond to the
values stated on the nameplate.
Recommended size of fuse
For recommended size of fuses see the tables below.
3 × 440-480 V, Model K
Motor size
[HP]
Recommended
[A]
Maximum
[A]
Fuse type
20 50 80 gG
25 60 80 gG
30 70 80 gG
63
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