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36 l Installation, Operation and Maintenance Manual – Synchronous Motors – S Line – Brushless – Horizontal 11866576
6 COMMISSIONING
When the motor is started for the first time or after a prolonged standstill, several aspects must be considered besides the
regular operation procedures.
TTENTION
Avoid any contact with electric circuits;
Even low-voltage circuits may be life threatening;
In any electromagnetic circuit, overvoltages may occur under certain operating conditions;
Do not open an electromagnetic circuit suddenly, because the presence of an inductive discharge voltage
may break the insulation or injure the operator;
In order to open those circuits, disconnect switches or circuit breakers must be used.
6.1 PRELIMINARY INSPECTION
Before the first operation of the motor or after long
periods out of operation, the following items must be
inspected:
1. Check if the motor is correctly aligned;
2. Check if the motor feet were fixed with the torque
recommended in this manual. The motor must be
doweled to the base;
3. Check if the motor is clean and if the packages,
measuring instruments and alignment devices were
removed from the motor operating area;
4. Check if the motor is properly grounded;
5. Measure the insulation resistance of the windings,
making sure they are within the specified value;
6. Check if coupling connecting components are in
perfect operating conditions, duly tightened and
greased, when necessary;
7. Check if the bearings are not damaged, if they are
properly fixed and aligned;
8. Check if the bearings are properly lubricated. The
lubricant must be of the type specified on the
nameplate. Check the oil level of oil-lubricated
bearings. Bearings with forced lubrication must have
the oil pressure and flow as specified in their
nameplate;
9. Check if the field control and the excitation system
are properly connected according to the instruction
in the specific installation manual;
10. Check if the protection relay is parameterized and
operating according to the selectivity study;
11. Check if the power grid cables are properly
connected to the motor main terminals and ensure
that they are properly tightened and no short-circuit
possibility exists;
12. Inspect the cooling system. In water-cooled motors,
inspect the operation of the radiator water supply
system. In motors with forced ventilation, check the
rotation direction of the fans;
13. Motor air inlets and outlets must be unobstructed;
14. The moving parts of the motor must be protected to
prevent accidents;
15. The terminal box covers must be properly fastened;
16. Test the high-pressure oil injection system (if any),
ensuring its proper operation;
17. Check if the brake is properly fixed and adjusted (if
any). Check the operation of the brake control panel;
18. Test the hydraulic unit operation (if any), ensuring its
proper operation;
19. When rotating the motor rotor, check if it does not
present strange noises.
6.2 FIRST START
6.2.1 Initial starting procedure
After all preliminary inspections have been carried out,
proceed according to the directions presented next in
order to perform the first start of the uncoupled motor:
1. Turn off the space heater;
2. Set the protections in the motor protection/excitation
panel;
3. In oil-lubricated bearings, check the oil level;
4. In bearings with forced-lubrication, start the oil
circulation system and check the level, flow and
pressure of the oil, making sure that they comply
with the data on the nameplate.
5. If the system has an oil flow detection device, it must
be waited until the return signal from the oil
circulation system of both bearings is received,
which makes sure that the oil has reached the
bearings;
6. Turn on the industrial water cooling system checking
the required flow and pressure (motors with air-water
heat exchanger);
7. Turn on the fans (motors with forced ventilation);
8. Switch on the high-pressure oil injection system (if
any), keeping it on as informed in the motor technical
documentation until the bearings can get the
lubrication by self-pumping;
9. Release the brakes (if any);
10. Check the motor rotation direction;
TTENTION
In order to invert the rotation direction of
motors with single direction, it is necessary to
consult WEG.
11. Start the motor according to section 7 of this
manual;
12. Keep the motor rotating at rated speed and write
down the bearing temperatures at 1-minute intervals
until they become constant. Any sudden or
continuous increase in the bearing temperature
indicates lubrication or friction surface abnormality;
13. Monitor the temperature, oil level of the bearings and
the vibration levels. If there is a significant variation of
any value, interrupt the motor start process, identify
possible causes and make the necessary correction;
14. When the bearing temperatures stabilize, it is
possible to start the motor with load and operate it
normally.
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