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Water cooling
In motors type M3LP, waste heat is drawn off by
water circulating inside the motor housing. The
water circulates around the motor in a jacket in-
side the housing and flows out through an outlet.
Motor frame sizes 280–315 have one water inlet
and one outlet with R ½" or R 1" threads in D-
and ND-end (fig 1).
NOTE!
Only closed-circuit water systems can be used in compliance with the require-
ments specified in the following section. Open water systems can be used in
types M3LP 280–315 when cooling water with a proportion of chloride below
120 mg/l is used. Water with a proportion of chloride up to 3000 mg/l can be
used if the ingress of oxygen into cooling water is prevented and the cooling
water temperature does not exceed 30 °C.
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Connection
Requirements for cooling water in motor
sizes 280–315
Water with a proportion of chloride up to
3000 mg/l can be used if the ingress of
oxygen into cooling water is prevented and
the cooling water temperature does not
exceed 30 °C. The highest allowed pressure
for cooling water is 5 bar.
Requirements for cooling water in motor
sizes 355–500
Cooling water must be tap water quality. Sea
water or water with a proportion of chloride
above 120 mg/l should not be used. The
highest allowed pressure for cooling water is
5 bar, with a recommended maximum input
water temperature of 40 °C. Steel frame
water- cooled construction is only to be used
with a closed fresh water circulation. The
cooling water circulates in ducts integrated in
the machine frame. The material of the frame
and ducts is carbon steel according to the
standard EN 10025-S235JR. This material is
prone to corrosion in saline and foul water.
The corrosion products and fouling deposits
Motor frame sizes 355–500 have one water inlet
and one outlet with R 1" threads in ND-end (fig 1).
Note! Read the cooling water instruction plate
as well as the markings for inlet and outlet pipes
on the motor!
might block the water flow in the ducts. This
is why it is important to use pure water in the
cooling system.
Standard values for the cooling water to be
used in the cooling system:
• pH 6.5–9.5
• Alkalinity (CaCO3) > 1 mmol/l
• Chloride (Cl) < 120 mg/l
• Conductivity < 1500 μS/cm
In most cases, normal tap water, i.e. water for
domestic consumption, meets all these
requirements.
The cooling water can also be inhibited with
an agent protecting the cooling system
against corrosion, fouling, and, when
necessary, against freezing. All materials in
contact with the cooling water (pipes, heat
exchanger, etc.) must be taken into account
when selecting a suitable inhibitor.
Use only suitable and high-class connection
parts and seals to connect the machine to the
water circuit.
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