Siemens 1PH728 Operating Instructions Manual page 19

Notice
Also pay attention to the Technical Data on the rating plates on the motor enclosure.
Cooling conditions in general
• In the case of motors that are cooled by the ambient air, the cooling air must be able to
flow unimpeded to and from the motors. Hot discharged air must not be reinducted (see
also section "Cooling")
• Ventilation openings may only be covered by louvered covers in motors of those types of
construction in which the openings point downwards.
Cooling conditions for motors with pipe connection
Motors that are configured to allow pipes to be connected and/or for operation with a
separately driven fan must have pipes and a fan of suitable type and dimensioning mounted
and connected to them.
Please refer to the table below for the potential pressure drop inside the motor for motors
with a pipe connection:
Table 3-2
1PH7 28.
Volumetric flow (V)
0.42 m
Notice
Please consider the additional pressure drop that arises in the system when connecting the
pipes.
Also ensure that:
• you comply with the conditions of the IP degree of protection.
Higher IP requirements may necessitate the installation of suitable filters and special
positioning of the intake and outlet openings.
• units and wires are mounted without distortion.
• the shipping covers of the ventilation openings are removed.
Siemens AG A5E00177602A
Operating Instructions V 2.0 1PH728
Pressure drop in motors with pipe connection
/s
3
Pressure drop (Δp)
600 Pa
Installation / Assembly
3.3 Installation
3-3