ABB M3LP Serie Manual Del Usuario página 6

Filling or draining cooling water
When filling, open the air plug on top of the motor (fig. 1).
Let the cooling water flow into the motor until it comes
out of the air gap. Close the air gap with a plug and
seal the joint with sealing tape or strip. Filling must be
done carefully so that no air is left in the motor's cooling
channels. Check for possible leaks after the piping and
joints have been connected.
When emptying, open the emptying plug underneath the
motor and the air plug on top of the motor. In motor sizes
280–315 emptying can be done with pressurized air. After
emptying, the plugs must be re-fitted and the seals of the
joints must be checked.
CAUTION!
The cooling water temperature may be high,
possibly exceeding even 70 °C!
6–EN
ABB Motors and Generators | Add. manual for Water cooled motors 02-2011
Condensation drain holes
It is of special importance with water cooled motors that
the condensation drain holes are located in the correct
position (fig. 1). Check that the condensation drain
holes face downwards, especially when the mounting
arrangement differs from standard.
Water leakage detector
As an option, there is the possibility to order the motors
with a float type leakage detector (fig. 2). The leakage
detector has a magnetic float switch. The magnetic float
switch is positioned on a non-magnetic guide tube. When
a specified water level is reached, the magnetic field
produced by the magnet in the float actuates a reed switch
(sealed contact) inside the guide tube. This closes the
electric circuit that transmits the alarm signal to the control
board.
Vertical mounting of the motor has only one leakage
detector, while horizontal mounting has two. The detectors
are connected in the lowest part of the motor and vertically
installed according to the mounting arrangement of the
motor. The maximum deviation from the vertical axis line is
±30°.
Electrical connection of float switch
max. voltage 230 V max. current 1 A
DC/AC
Figure 2 shows a typical connection diagram of float
switches for a horizontal mounted motor.
switch capacity 100 VA