English (GB)
17
8. Operating conditions
8.1 Maximum number of starts and stops
The number of starts and stops via the power supply
must not exceed four times per hour.
When switched on via the power supply, the motor
starts after approximately 5 seconds.
If a higher number of starts and stops is desired, use
the input for external start/stop when
starting/stopping the motor.
When started via an external on/off switch, the motor
starts immediately.
8.2 Ambient temperature
8.2.1 Ambient temperature during storage and
transportation
Minimum: -30 °C
Maximum: 60 °C.
8.2.2 Ambient temperature during operation
Minimum: -20 °C
Maximum: 50 °C.
The motor can operate with the rated power output
(P2) at 50 °C, but continuous operation at higher
temperatures reduces the expected product life. If
the motor is to operate at ambient temperatures
between 50 and 60 °C, select an oversized motor.
Contact Grundfos for further information.
8.3 Installation altitude
Installation altitude is the height above sea level of
the installation site.
Motors installed up to 1000 metres above sea level
can be loaded 100 %.
Motors installed more than 1000 metres above sea
level must not be fully loaded due to the low density
and consequent low cooling effect of the air. See fig.
16.
Fig. 16 Derating of motor output power (P2) in
relation to altitude above sea level
8.4 Humidity
Maximum humidity: 95 %.
If the humidity is constantly high and above 85 %,
open the drain holes in the drive-end flange. See
section 6.6 Drain holes.
8.5 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 section 6.4 Ensuring
motor cooling.
• The temperature of the cooling air must not
exceed 50 °C.
• Keep cooling fins and fan blades clean.
If the motor is installed above 2000 m, it
does not comply with the SELV/PELV
classification.
TM05 5243 3512
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