Seepex BN 5-12 Series, Operation & Maintenance Manual

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Manual of Electric Motors 96
E
N
G
LI
S
H
Please consider the minimum distances shown in the Table 7.1 as reference value;
g
Ensure correct water flow rate and water temperature when water cooled motors are used. See item 7.2;
g
Ensure that all rotating parts, such as pulleys, couplings, external fans, shaft, etc. are protected against
accidental contact.
Other tests and inspections not included in the manual may be required, depending on the specific installation,
application and/or motor characteristics.
After all previous inspections have been carried out, proceed as follows to start the motor:
g
Start the motor on no-load (if possible) and check the motor direction of rotation. Check for the presence of
any abnormal noise, vibration or other abnormal operating conditions;
g
Ensure the motor starts smoothly. If any abnormal operating condition is noticed, switch off the motor, check
the assembly system and connections before the motor is started again;
g
If excessive vibrations are noticed, check if the motor mounting bolts are well tightened or if the vibrations are
not generated and transmitted from adjacent installed equipment. Check the motor vibration periodically and
ensure that the vibration limits are as specified in item 7.2.1;
g
Start the motor at rated load during a short time and compare the operating current with the rated current
indicated on the nameplate;
g
Continue to measure the following motor variables until thermal equilibrium is reached: current, voltage,
bearing and motor frame temperature, vibration and noise levels;
g
Record the measured current and voltage values on the Installation Report for future comparisons.
As induction motors have high inrush currents during start-up, the acceleration of high inertia load requires an
extended starting time to reach full speed resulting in fast motor temperature rise. Successive starts within
short intervals will result in winding temperature increases and can lead to physical insulation damage reducing
the useful life of the insulation system. If the duty cycle S1 / CONT. is specified on the motor nameplate, this
means that the motor has been designed for:
g
Two successive starts: first start from cold condition, i. e., the motor windings are at room temperature and
the second start immediately after the motor stops;
g
One start from hot condition, i. e., the motor windings are at rated temperature.
The Troubleshooting Chart in section 10 provides a basic list of unusual cases that may occur during motor
operation with the respective corrective actions.
Table 7.1 - Minimum distance between the fan cover and wall
Frame size Distance between the fan cover and the wall (L)
IEC NEMA mm inches
63 - 25 0.96
71 - 26 1.02
80 - 30 1.18
90 143/5 33 1.30
100 - 36 1.43
112 182/4 41 1.61
132 213/5 50 1.98
160 254/6 65 2.56
180 284/6 68 2.66
200 324/6 78 3.08
225
250 364/5
404/5
85 3.35
280
444/5
445/7
447/9
108 4.23
315
L447/9
504/5
5006/7/8
5009/10/11
122 4.80
355
586/7
588/9
5807/8/9
5810/11/12
136 5.35
400
6806/7/8
6809/10/11
147 5.79
450 7006/10 159 6.26
500 8006/10 171 6.73
560 8806/10 185 7.28
630 9606/10 200 7.87
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