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Siemens D 21.4 · 2017
SIMOTICS servomotors
Technical definitions for AC motors
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Overview
Regulations, standards, and specifications
The motors comply with the appropriate standards and regula-
tions, see table below.
As a result of the fact that in many countries the national regula-
tions have been harmonized with the international IEC 60034-1
recommendation, there are no longer any differences with
respect to coolant temperatures, temperature classes, and
temperature rise limits
The motors listed below are UL-approved by Underwriters
Laboratories Inc. and also comply with Canadian cUR
standards: SIMOTICS S-1FK7/S-1FT7/SIMOTICS T-1FW3/
S-1FW6/SIMOTICS M-1PH8 (without brake)/SIMOTICS L-1FN3.
Degrees of protection for AC motors
A suitable degree of protection must be selected depending
on the operating and environmental conditions to protect the
machine against:
•
Ingress of water, dust, and solid foreign objects,
•
Contact with rotating parts inside a motor, and
•
Contact with live parts.
Degrees of protection of electric motors are specified by a code.
This comprises 2 letters, 2 digits and, if required, an additional
letter.
IP
(International Protection)
Code letter designating the degree of protection against contact
and the ingress of solid foreign objects and water
0
to
6
1st digit designating the degree of touch protection and
protection against ingress of solid foreign objects
0
to
8
2nd digit designating the degree of protection against ingress of
water (no oil protection)
W, S
and
M
Additional code letters for special degrees of protection
Recommended degrees of protection for AC motors
When cooling lubricants are used, protection against water
alone is inadequate. The IP rating should only be considered as
a guideline in this case. The motors may have to be protected by
suitable covers. Attention must be paid to providing suitable
sealing of the motor shaft for the selected degree of protection
for the motor (for 1FT7: degree of protection IP67).
The table can serve as a decision aid for selecting the proper
degree of protection for motors. With mounting position IM V3/
IM V19/IM V6/IM V35 with shaft extension facing upwards, a per-
manent covering of liquid on the flange must be avoided. With a
mounting position with the shaft extension facing upwards, liquid
remaining on the motor flange can be avoided by selecting a
1FT7 motor with degree of protection IP67 and a recessed
flange.
General specifications for rotating
electrical machines
IEC 60034-1
Terminal designations and direction of
rotation for electrical machines
IEC 60034-8
Types of construction of rotating
electrical machines
IEC 60034-7
Cooling methods of rotating
electrical machines
IEC 60034-6
Degrees of protection of rotating
electrical machines
IEC 60034-5
Vibration severity of rotating
electrical machines
IEC 60034-14
Noise limit values for rotating
electrical machines
IEC 60034-9
Cylindrical shaft extensions for
electric machines
DIN 748 Part 3/
DIN IEC 60072
Most motors are supplied with the following degrees of protection:
Motor
Degree of
protection
1st digit:
Touch
protection
Protection
against
foreign objects
2nd digit:
Protection
against water
Internally
cooled
IP23
Protection
against
finger
contact
Protection against
medium-sized,
solid foreign
objects above
12 mm Ø
Protection against
spray water up to
60° from the
vertical
Surface-
cooled
IP54
Complete
protection
against
accidental
contact
Protection against
damaging dust
deposits
Splash water from
any direction
IP55
Jet water from
any direction
IP64
Complete
protection
against
accidental
contact
Protection against
ingress of dust
Splash water from
any direction
IP65
1)
Jet water from
any direction
IP67
1)
Motor under
specified
pressure and
time conditions
under water
Liquids
Effect
General
workshop
environment
Water; general
cooling lubricant
(95% water,
5% oil)
Dry
IP64
–
Liquid-enriched
environment
–
IP64
Mist
–
IP65
Spray
–
IP65
Jet
–
IP67
Splash/brief immersion/
constant inundation
–
IP67
1)
DIN VDE 0530 Part 5 or EN 60034 Part 5 specifies that there are only
5 degrees of protection for the first digit code and 8 degrees of protection
for the second digit code in relation to rotating electrical machinery. How-
ever, IP6 is included in DIN 40050, which generally applies to electrical
equipment.
© Siemens AG 2017