Water Cooling - ABB M3LP Serie Manual Del Usuario

Validity
This additional installation, operation, and maintenance
manual is valid for water cooled motors (M3LP 280–450)
and is to be read together with the main manual (Low
Voltage Motors/Manual). Additional information may be
required for some machines due to special application
and/or design considerations.
Use
Normally, water cooled motors are manufactured
to specific customer requirements. However, these
instructions refer to 'standard' water cooled motor
versions.
Handling
Should the motor be used or stored in environments with
the risk of sub-zero temperatures, freezing of the water
inside the motor must be prevented. This can be done
either by emptying the water jacket or by using anti-freeze
additives.
Before emptying the water jacket, protect it with a
corrosion-protective emulsion, e.g. Esso Cutwell 40, Shell
Dromus Oil BS, or equivalent, in accordance with the
instructions given by the emulsion manufacturer. If the
motor has been standing for a long period of time with no
water, ensure that water can circulate freely before using
the motor again. Remove possible rust blockages by
dissolving them with oxalic acid:
1. Empty the frame of water.
2. Fill the frame with water mixed with oxalic acid (100 g/
liter).
3. Let the acid take effect for approximately 10 minutes.
4. Empty the frame and wash it with pressurized water.
5. Repeat the treatment if necessary.
If the motor is equipped with a separate bearing fan,
ensure that there is free ventilation airflow. Installation of a
motor with a bearing fan in a closed flange construction
(i.e. flange-mounted motor) is not recommended.
Cleaning of motor cooling system helps to restore system
efficiency. ABB recommends using regular flushing and
cyclonic or magnetic filters, which should be regularly
maintained. Flushing can be done as described above.
Check that water in the system is neutral or near neutral
pH after flushing.
4–EN
ABB Motors and Generators | Add. manual for Water cooled motors 02-2011

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 inside 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).
Motor frame sizes 355–400 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!
NOTE!
Only closed circuit water systems can be used in
compliance with the requirements specified in the
following section. Open water system 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 ingess of oxygene into
cooling water is prevented and the cooling water
temperature does not exceed 30 °C.