SIEMENS
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Siemens D 83.1 · 2016
1
Introduction
General technical specifications
Power ratings and operating modes
■
Overview
The power ratings specified in the power tables are valid for duty
type S1 (continuous duty at constant load) in accordance with
EN 60034-1. For duty types S4, S5, S7 and S8 in addition to the
values for cyclic duration factor and switching frequency, the
moment of inertia of the motor (
J
M
) and driven machine (
J
ext
)
must also be stamped. All moments of inertia must be referred
to the motor speed.
EN 60034-1 categorizes the groups of duty types as follows:
1.
Duty types in which starting and electrical braking do not
affect the overtemperature of the stator winding of the motor:
S2:
Short-time duty
Operating times of 10, 30, 60, and 90 minutes are
recommended. After each period of duty the motor
remains at zero current until the winding has cooled
down to the coolant temperature.
S3:
Intermittent duty without the influence of starting on
the temperature.
Unless specified otherwise, the duty cycle time is
10 minutes. Values of 15, 25, 40 and 60 % are
recommended for the cyclic duration factor.
S6:
Continuous duty with intermittent load.
Unless specified otherwise, the duty cycle time is also
10 minutes. Values of 15, 25, 40 and 60 % are
recommended for the cyclic duration factor.
2.
Duty types in which starting and braking have a
corresponding effect on the overtemperature of the stator
winding and the rotor cage:
S4:
Intermittent duty with the influence of starting on the
temperature – switching cycles per hour
(c/h)
refers to
starting cycles.
S5:
Intermittent duty with the influence of starting and
braking on the temperature – switching cycles per
hour
(c/h)
refers to starting and braking cycles.
S7:
Continuous duty with starting and braking – the load
during the operating period must be known.
S8:
Continuous duty with pole changing – the load during
the operating period must be known.
S9:
Continuous duty with non-periodic load and speed
changes (converter operation).
S14:
Duty with discrete constant loads.
Most of the intermittent operating conditions occurring in
practice are a combination of the duty types listed under
1. and 2. All of the operating conditions must be known in order
to precisely determine a suitable motor.
© Siemens AG 2016