Table 3-2 Pressure Drop In Motors With Pipe Connection - Siemens 1PH728 Operating Instructions Manual

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.
● units and wires are mounted without distortion.
● the shipping covers of the ventilation openings are removed.
Balancing quality
The rotors are balanced dynamically. In the case of shaft ends with feather keys, the method
used to balance the rotors can be identified from the following coding to be found on the end
face at the drive end of the shaft end:
● Code "H" means balancing with half a feather key (standard version); this means that in
● "F" means balancing with a whole feather key (optional version).
Make sure that the balancing method of the output element is correct!
A suitable tool must always be used for fitting and pulling off output elements.
The feather keys are only locked against falling out during shipping.
A5E00177602A AD
Siemens AG Operating Instructions 2.02 1PH728
Siemens Hardware
Pressure drop in motors with pipe connection
/s
3
Higher IP requirements may necessitate the installation of suitable filters and special
positioning of the intake and outlet openings.
order to maintain the balancing quality it may be necessary to cut back the part of the
feather key protruding from the drive element and the shaft profile if the motor has a short
output element.
CAUTION
Transport, assembly, and connection
Pressure drop (Δp)
600 Pa
3.2 Assembly
27