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Philosophy of quality systems and testing of electrical machines 11/269
A
7
4

i

C'
dimensions
in
All dimensions in mm
mm
All
D = 6.3 mm for the tests of second numeral 5
D = 12.3 mm for the tests of second numeral 6
Figure 11.1 1 Standard test nozzle for hose tests
Table 11.9 Permissible tolerances in performance figures

.s. !VO Itrr1r Tolrmnce
I Efficiency
(a) By summation of losses:
Motors up to SO kW -15% of (I00 - rJ)
Motors above 50 kW -10% of I100 - rJ)
(hl By input-output test -15% of (100 - rJ)
2 Total loses applicable to inotors ahove SO kW + 10% of total losses
3 Power Factor -1/6 of (I - cos 4). Subject to a minimum of 0.02 and maximum
0.07.
1 Slip a[ full load and at working temperature
(a) Machines having output I kW or more ? 20% of the guaranteed slip
1 b) Machines having output less than 1 kW k 30% of the guaranteed slip
5 Breakaway starting current (for squirrel cage motors) + 20% of the guaranteed starting current (no lower limit)
6 Locked inotor torque -15% to + 25% of the guaranteed torque (+ 3% inay be exceeded
by agreement)
7 Pull-out torque -10% of the guaranteed torque. except that after allowing for this
tolerance, the torque will not be lesh than 1.6 or I .5 times the rated
torque
x Pull-up (pull-in) torque -15% of the guaranteed torque
9 Vihrarion +IO% of guaranteed classification
IO Noise level +3 dB (A) over guaranteed value
II Locked rotor current of squirrel cage motors with short- +20% of the guaranteed current
circuited rotor and with any jpecified starting apparatus (no lower limit)
I2 Moment of inertia or stored energy constant, applicable
to motors of fraine sires ahove 3 15 +IO% of the guaranteed value

Relevant Standards

60034- 1/1996 Rotating electrical machine\ BS EN 60014-1/1995
Rating and pcrformancc
Temperature rise measuremcnt of rotating electrical I280211 989
machine\
60034-2/1996 Method for determining losses and efficiency of rotating 402911 99 I BS 4999-102/1987
electrical machines
60034-51199 I Rotaring electrical machincs 469 I /I 985 BS 4999- 1051 I988
Claasification of degrees of protection provided by
enclo\ure\ for rotating machinery (IP Code)
60034-6/1991 Rotating electrical machines. Methods of cooling (IC Code) 6362/1995 BS EN 60034-6/1994