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SEMI S22-1103a © SEMI 2003, 2005 31 d) number of phases, e) number of wir es, f) frequency, g) full-load current, h) ampere rating of the largest motor or load, i) short-circuit int errupting rating of the equip ment mai…
SEMI S22-1103a © SEMI 2003, 2005 30
18.4.4 The incoming circuit or feeder to power conversion equipment, included as part of an adjustable speed drive
system, should be based on the rated input to the power conversion equipment. Unless the power conversion
equipment is certified by an accredited testing laboratory to indicate that overload protection is included and suitable
for the motor, additional overload protection should be provided.
18.4.5 Over-speed protection should be provided in cases where over-speed may cause a hazardous condition.
19 Accessories and Lighting
19.1 Lighting Circuits
19.1.1 One conductor of all equipment lighting and maintenance lighting circuits should be bonded to the
equipment protective earthing system in accordance with ¶19.1.2 or 1¶9.1.3. See ¶17.6.3 for conductor
identification.
19.1.2 Where the lighting circuit is supplied by a separate transformer, the earthing should occur at the transformer.
19.1.3 When the protective conductor is connected to a screw-shell lamp holder, it should be connected to the screw
shell.
19.1.4 The conductors connected to stationary lights used as an integral part of the equipment should be suitable for
their application.
19.1.5 Equipment work lights should not contain switches or receptacles such that exposure to liquids or other
substances may increase the risk of electric shock or fire.
NOTE 53: Switches or receptacles should be located where liquids or other substances will not increase the risk of electric
shock.
19.2 Attachment Plugs and Receptacles
19.2.1 Attachment plugs and receptacles should be rated and labeled for the applied voltage and current.
19.2.2 Where used in circuits of 300 Volts or more, attachment plugs and receptacles should be rated for the
application (load break or no-load break), and constructed to contain any arc generated when a connection is made
or broken.
19.2.3 Attachment plugs and receptacles should be designed or installed to prevent the ingress of substances that
may increase the risk of electric shock or fire.
19.2.4 Receptacles internal to the electrical enclosure should be permitted only for maintenance equipment or AC
power distribution within the enclosure to assemblies designed and approved for cord-and-plug connection. See
¶17.3 for more details regarding receptacles.
20 Markings
20.1 General Hazard alert signs, nameplates, markings, and identification plates should have sufficient
durability to withstand the anticipated physical environment where the equipment will be installed.
20.2 Hazard Alert Signs Enclosures should be labeled to inform the end user of the hazards that they enclose.
These labels should comply with SEMI S1.
EXCEPTION: This labeling is not necessary where the enclosures are interlocked with non-defeatable interlocks to
disconnect the hazards in question.
20.3 Functional Identification Control devices, visual indicators, and displays should be clearly and durably
marked with their functions either on, or adjacent to, the items. Refer to ¶14.2.2, Markings.
20.4 Equipment Nameplate A permanent nameplate should be attached to the main electrical enclosure or
equipment where it is plainly visible after installation. This nameplate should include the following information:
a) the manufacturer’s name and address,
b) the equipment name, model, and serial number,
c) supply voltage,
SEMI S22-1103a © SEMI 2003, 2005 31
d) number of phases,
e) number of wires,
f) frequency,
g) full-load current,
h) ampere rating of the largest motor or load,
i) short-circuit interrupting rating of the equipment main overcurrent protective device,
j) ampere rating of the overcurrent protective device where furnished as part of the equipment, and
k) the electrical diagram number(s) or the number of the index to the electrical diagrams (bill of material).
20.5 Where more than one incoming supply circuit is to be provided, the nameplate should state the above
information for each supply circuit.
EXCEPTION: Where the only load is a single motor or motor controller, the motor nameplate is permitted to serve
as the electrical equipment nameplate when it is plainly visible.
20.6 Full Load Current — The full-load current shown on the nameplate should not be less than the full-load
currents for all motors and other equipment that may be in operation at the same time under normal conditions of
use. Where unusual loads or duty cycles require oversized conductors, the necessary capacity should be included in
the full-load current specified on the nameplate.
20.7 Overcurrent Marking — Where overcurrent protection is provided in accordance with ¶9.1.5, the equipment
should be marked “overcurrent protection provided at machine supply terminals.” A separate nameplate may be
used for this purpose.
20.8 Reference Designations All enclosures, assemblies, control devices, and components should be plainly
identified with the same reference designation as shown in the technical documentation or identified through
equivalent means.
21 Technical Documentation
21.1 Installation Diagram The installation instructions should give all the information necessary for complete
installation and safe start up of the system. This should include:
a) a comprehensive description of the equipment, installation and mounting, and the connection to the electrical
supply or supplies, and
b) an explanation of the equipment’s installation instructions including facilities supply conductors.
21.2 Block (system) Diagrams and Functional Diagrams When it is necessary to facilitate the understanding of
the principles of operation, a block (system) diagram should be provided. A block (system) diagram symbolically
represents the electrical equipment together with its functional interrelationships without necessarily showing all of
the interconnections.
21.3 Circuit Diagrams Circuit diagrams or schematics for power distribution, EMO and interlock circuits should
be provided. Where a block (system) diagram does not sufficiently detail the elements of the electrical equipment
for safe installation and servicing, circuit schematics should be furnished.
21.4 Operating Instructions The end user documentation should include operating instructions detailing proper
procedures for operation of the equipment. Particular attention should be given to the safety measures provided and
to the improper methods of operation that are anticipated.
21.5 Maintenance Instructions The technical documentation should contain maintenance instructions detailing
procedures for servicing and maintaining the equipment. Attention should be given to how these procedures may be
performed safely. A preventative maintenance schedule should be provided with the equipment.
21.6 Functional Description of Interlocks — A functional description of interlocks should be provided which
provides sufficient detail to explain their operation.
SEMI S22-1103a © SEMI 2003, 2005 32
21.7 Method for Identifying Replacement Parts — A method of identifying parts that are anticipated to be replaced
by the user should be included in the instructions provided with the equipment.
21.8 Translations — Where required by law, the information should be provided in the primary language of the
location in which the equipment is to be used. However, the language in which the information was created should
be identified.
21.9 Applicable to All Documentation The document reference designation system should be in accordance with
IEC 61346-1; or a reference key should be provided.
NOTE 54: Additional criteria pertaining to installation, operation, and maintenance instructions are provided in SEMI S2 and
SEMI S13.
22 Testing
22.1 General The tests outlined in this document are to be performed by trained and qualified personnel who
have knowledge of the techniques and the test apparatuses described herein.
22.1.1 All test equipment should be calibrated and traceable to a calibration standards organization (e.g., National
Institute of Standards and Technology (NIST) in the United States or the National Metrology Institute in Japan).
22.1.2 The calibration interval for test equipment should be appropriate to the test equipment; usually this should
not exceed one year.
22.1.3 Except where noted otherwise, the equipment should be tested under the least favorable conditions within the
manufacturer's operating specifications. These conditions include:
a) supply potential,
b) supply frequency,
c) position of movable parts,
d) operating mode (e.g., full temperature conditions, motors in operation), and
e) adjustment of thermostats, regulating devices, or similar controls in operator-accessible areas.
NOTE 55: Least favorable conditions are those conditions in the manufacturer’s operating specifications under which the
equipment is least likely to pass the test.
22.1.4 To determine the least favorable supply potential for a test, consider:
a) multiple-nominal rated potentials (e.g., 120/240 V), and
b) extremes of nominal rated potential ranges (e.g., 208-240 V).
NOTE 56: Consideration of the tolerance on a nominal rated potential (e.g., 120 5 percent) is not necessary.
NOTE 57: Some standards (e.g., IEC 61010-1 and IEC 60950) may specify 90 percent and 110 percent of any rated supply
voltage.
22.1.5 To determine the least favorable supply frequency for a test, consider the nominal frequencies as specified
(e.g., 50 Hz, 60 Hz., or 50/60 Hz).
NOTE 58: Consideration of the tolerance on a nominal rated frequency (e.g., 50 ± 0.5 Hz) is not usually necessary.
22.1.6 As an alternative to carrying out tests on the complete equipment, tests may be conducted on circuits,
components and sub-assemblies independent of the equipment, provided that the results of the tests would be
representative of those performed as part of the assembled equipment.
EXCEPTION: The leakage current and earthing (grounding) continuity tests identified in ¶22.2 and ¶22.3 should be
completed only on fully assembled equipment.
22.2 Leakage Current Test for Cord-and-Plug Equipment
22.2.1 Test Equipment A 1500 ohm resistor shunted by a 0.15µF capacitor (impedance network) and a true RMS
voltmeter with an accuracy of 1.0 percent. The impedance network may be a separate assembly or incorporated
within a leakage current measuring instrument.