ABB M3LP Serie Manual Del Usuario página 5

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 355–450
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 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
Motor type Number of
M3LP inlets
Frame type
280 SM_ 1
315 KH_ 1
315 LK_ 1
355 ML_ 1
355 LK_ 1
400 L_ 1
450 L_ 1
Cooling Water
water flow pressure
rate (l/min) min. (bar)
20 2,0
30 2,0
30 2,0
30 2,0
35 2,0
40 2,0
50 2,0
Add. manual for Water cooled motors 02-2011 | ABB Motors and Generators EN–5
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.
In environments with risk of sub-zero temperatures, a
glycol/water mixture can be used with 40/60 mixture
(glycol/water), with a recommended minimum environment
temperature of -20 °C.
The lower the cooling water input temperature, the better
the cooling of the motor.
For some cases a higher input temperature can be allowed
when requested and checked by the manufacturer.
The outlet water temperature rise is from 7–15 K.
The minimum pressure and amount of cooling water for
the basic construction of a water cooled motor is shown
in the following table. Please check the requirements for
pressure and the amount of cooling water in the case of
special constructions.
(If the amount of water varies, its temperature rise will be
inversely proportional to the flow rate.)
Heat transfer of thermal loss in (approx.)
Water
temperature ratio air/water at room temperature
rise (K)
Temperature of inlet cooling water
25 °C
7-12 10/90
7-12 10/90
7-12 10/90
10-15 10/90
10-15 10/90
10-15 10/90
10-15 10/90
Water-space
of st. frame
(l)
40 °C
30/70 1,2
30/70 3,5
30/70 4,7
30/70 28
30/70 35
30/70 50
30/70 65