Download DOC:STI/325/8 July 1999 1 SCHEME OF TESTING AND

DOC:STI/325/8
July 1999
SCHEME OF TESTING AND INSPECTION
FOR CERTIFICATION OF
THREE-PHASE INDUCTION MOTORS (Fifth Revision)
ACCORDING TO IS 325:1996
1.0
LABORATORY: A laboratory shall be maintained which shall be suitably
equipped and staffed, where different tests given in the specification shall be
carried out in accordance with the methods given in the specification.
1.1
All testing apparatus shall be periodically checked and calibrated and records of
such checks/calibration shall be maintained.
2.0
TEST RECORDS: All records of tests and inspection shall be kept in suitable
forms approved by the Bureau.
2.1
Copies of any records and other connected papers that may be required by the
Bureau shall be made available at any time on request.
3.0
QUALITY CONTROL: It is recommended that as far as possible, Statistical
Quality Control (SQC) methods may be used for controlling the quality of the
product during production as envisaged in the Scheme [See IS 397 (Part I):1972,
IS 397 (Part 2):1985 and IS 397 (Part 3):1980].
3.1
In addition, effort should be made to gradually introduce a Quality Management
System in accordance with the Quality System Modules as per IS/ISO 9001 or
IS/ISO 9002 or IS/ISO 9003 as appropriate to the activities of the organization.
4.
STANDARD MARK: The standard mark(s) as given in column (1) of the First
Schedule of the license shall be printed on the label applied to each container and
the covering carton, provided always that the materials in the container to which
the Mark is thus applied conforms to every requirement of the specification.
4.1
Marking – In addition, each motors shall be marked with the following
information on its rating plate:
a)
b)
c)
d)
e)
f)
g)
h)
i)
j)
k)
Induction Motor;
Name of manufacturer;
Manufacturer’s number & Frame reference;
Serial Number, Month and year of manufacture;
Rated voltage and winding connections;
Rated output in kW;
Current, in amperes at rated output;
Frequency in Hz;
Type of duty;
Class of insulation;
Number of phases;
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DOC:STI/325/8
July 1999
l)
m)
n)
o)
p)
q)
r)
Speed in revolutions per minute, at rated output;
Efficiency at rated output;
Rotor (secondary) voltage and winding connections (for wound rotor
motors);
Rotor (secondary) current in amperes at rated output (for wound rotor
motors);
Ambient temperature when above 40 Degree Celcius;
Degree of protection;
Licence number below the Standard Mark.
4.1.1
The position of the Terminal box and the terminal markings shall be as per Clause
19 of IS 325:1996.
4.2
The performance values for the following characteristics shall be in accordance
with Tables 1 to 8 of IS 8789:1996 (as applicable)
a)
b)
c)
d)
Full load speed;
Full load current;
Breakaway Torque in terms of Full Load Torque; and
Nominal Efficiency.
4.2.1
Other characteristics, when declared, shall be subject to the tolerances as specified
in Tabel 2 of IS 325:1996.
5.0
LEVELS OF CONTROL: The tests as indicated in Table 1 and at levels of
control specified therein shall be carried out on the whole production of the
factory covered by the scheme and appropriate records and charts maintained in
accordance with clause 2.0 above. All the production which conforms to the
Indian Standard and covered by this licence shall be marked with Certification
Mark of the Bureau.
5.1
In respect of all other clauses of the standard (other than those mentioned under
levels of control – Table 1, the factory shall maintain appropriate controls and
checks to ensure that their product conforms to the various requirements of the
standard.
6.0
RAW MATERIALS:
Raw materials and components used for the
manufacture of motors shall be suitable for the application and shall conform to
relevant Indian Standards wherever these exist. Whenever it is not practicable to
meet this requirement, it shall be subject to agreement between the manufacturer
and the purchaser.
6.1
It is recommended that, as far as possible, each consignment of raw materials
should be accompanied by a test certificate certifying its conformity to the
relevant Indian Standard.
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DOC:STI/325/8
July 1999
7.0
REJECTIONS: A separate record shall be maintained giving information
relating to the rejection of the production not conforming to the requirements of
the specification and the method of its disposal. Such material shall in no case be
stored together with that conforming to the specification.
8.0
SAMPLES: The licensee shall supply, free of charge, the samples required in
accordance with Bureau of Indian Standard (Certification) Regulations, 1988, as
subsequently amended, from his factory or godowns. The Bureau shall pay for the
samples taken by it from the open market.
9.0
REPLACEMENT: Whenever a complaint is received soon after the goods with
Standard Marks have been purchased and used and if there is adequate evidence
that the goods have not been misused, defective goods are replaced free of cost by
the licensee in case the complaint is proved to be genuine and the warranty period
(where applicable) has not expired. The final authority to judge the conformity of
the product to the Indian Standard shall be with the Bureau.
9.1
In the event of any damages caused by the goods bearing the Standard Mark, or
claim being filed by the consumers against BIS Standard Mark and not
“conforming to” the relevant Indian Standard, entire liability arising out of such
non conforming product shall be of licensee and BIS shall not in any way be
responsible in such cases.
10.0
STOP MARKING: The marking of the product shall be stopped under
intimation to the Bureau if, at any time, there is some difficulty in maintaining the
conformity of their product to the specification or the testing equipment goes out
of order. The marking may be resumed as soon as the defects are removed under
intimation to Bureau.
The marking of the product shall be stopped immediately if directed to do so by
Bureau for any reason. The marking may then be resumed only after permission
by the Bureau. The information regarding resumption of markings shall also be
sent to the Bureau.
11.0
PRODUCTION DATA: The licensee shall send to BIS as per the enclosed
proforma to be authenticated by a Chartered Accountant a statement of quantity
produced, marked and exported by him and the trade value thereof end of each
operative year of the licence (See proforma enclosed).
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DOC:STI/325/8
July 1999
IS 325:1996
THREE-PHASE INDUCTION MOTORS
TABLE 1 LEVELS OF CONTROL
(Para 5 of the Scheme of Testing and Inspection)
LEVELS OF CONTROL
TEST DETAILS
Clause
Requirements
Test Method
Clause
No.
of Frequency
Samples
Remarks
Reference
22.3.1(k) Insulation Resistance
&
test
22.3.2(a)
22.3.1(b) Measurement
of
&
resistance of windings
22.3.2(b)of stator and would
rotor
22.3.1(c) No Load test at rated
&
voltage to determine
22.3.2(c) input current, power
& speed.
22.3.2(d)Locked
Rotor
reading of voltage,
current & power input
at a suitable reduced
voltage.
22.3.1(e) Reduced voltage
&
running up test(for
22.3.2(e)squirrel cage motors
up to 37 kW only)
22.3.1(d) Open circuit voltage
&
ratio of stator & rotor
22.3.2(f) windings (for slip
ring motors)
22.3.1(a) High Voltage test.
&
22.3.2(g)
22.3.1(g) Full load test to
determine efficiency,
power factor & slip
(also see Note1)
25
IS 325:1996
Each
Motor
6
IS 4029:1967
-do-
23.1
IS 325:1996
-do-
23.4
IS 325:1996
-do-
23.2
IS 325:1996
-do-
23.3
IS 325:1996
-do-
24.1
IS 325:1996
-do-
23.5
IS 325:1996
One
motor
22.3.1(f) Locked rotor test to
determine Breakaway
Torque
23.4
IS 325:1996
-do-
4
From every
50 motors
or less, of
identical
type
&
design.
Manufactur
ed in a
month
If any motor fails,
all
the
motors
produced
subsequently shall
be tested till that
time
five
consecutive
samples pass. For
every
failure,
appropriate
steps
shall be taken to
rectify the cause of
the
defect
in
subsequent motors
& record of the
same maintained.
DOC:STI/325/8
July 1999
IS 325:1996
THREE-PHASE INDUCTION MOTORS
TABLE 1 LEVELS OF CONTROL
(Para 5 of the Scheme of Testing and Inspection)
LEVELS OF CONTROL
TEST DETAILS
Clause
Requirements
Test Method
Clause
No.
of Frequency
Samples
Reference
22.3 (h) Temperature Rise test
(also see Note 1).
14
IS 325:1996
One
Motor
22.3.1(j) Momentary Overload
test.
13.2 & Pull-up Torque &
Table 2 Pull-out Torque
Table 1 Moment of Inertia
for stored energy
constant, applicable
to motors of frame
sizes above 315.
13.1
IS 325:1996
-do-
7.4
IS 4029:1967
-do-
7.4
IS 4889:1968
One
Motor
22.3(a) Dimensions.
Remarks
IS 1231:1974
or IS 2223:1983
Once in 3
months
for
each type and
design
of
motors
manufactured
during
that
period
-do-
22.3.1(n) Test for Vibration
Severity 15 of motor
(also see Note 2)
15
IS 325:1996
One
Motor
22.3.1(p)Test
for
Noise
Levels
(also see Note 2)
16
IS 325:1996
One
Motor
5
From
every
200 motors or
less,
of
identical type
and
design,
manufactured
in a month
Once in Three
months
for
each type and
design
of
motors
manufactured
during
that
period.
Once in two
years, for each
type
and
design
of
motors
manufactured
during
that
period
If any motor fails, all
the motors produced
subsequently shall be
tested till that time
three
consecutive
samples pass. For
every
failure,
appropriate steps shall
be taken to rectify the
cause of the defect in
subsequent motors and
record of the same
maintained.
DOC:STI/325/8
July 1999
IS 325:1996
THREE-PHASE INDUCTION MOTORS
TABLE 1 LEVELS OF CONTROL
(Para 5 of the Scheme of Testing and Inspection)
LEVELS OF CONTROL
TEST DETAILS
Clause
Requirements
Test Method
Clause
22.3(q) Test for Degree of
Protection
by
enclosure.
(also see Note 2)
22.3.1(r) Temperature Rise test
at limiting values of
voltage and frequency
variation (also see
note 2).
22.3.1(s) Over speed test
(also see note 2)
22.3.1(t) Test on insulation
system
(also see note 2)
No.
of Frequency
Samples
Reference
IS 325:1996
One
Motor
IS 13802:1989
-do-
Once in two
years, for each
type
and
design
of
motors
manufactured
during
that
period.
-do-
26
IS 325:1996
-do-
-do-
27
IS 325:1996
One
Motor
Once in four
years for each
type
and
design
of
motors
insulation
system.
5
Remarks
Note 1: While carrying out Temperature Rise Test, determination of Efficiency and Power
Factor. No Load and Locked rotor test shall be repeated and reading shall be
noted.
Note 2:These are optional tests and shall be carried out as per the mutual agreement with
the purchaser.
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