Derating - Siemens SIRIUS M200D Manual

Industrial controls load feeders and motor starters
Hide thumbs Also See for SIRIUS M200D:
Table of Contents

Advertisement

Mounting/Connecting
4.1 Mounting
4.1.2

Derating

What is derating?
Derating allows devices to be used even in harsh operating conditions by selectively
restricting the output capacity.
Derating factors
When M200D AS-i motor starters are operated under harsh conditions, the following factors
must be taken into account:
● Ambient temperature T
– The ambient temperature T
– The installation position affects how quickly the motor starter cools.
● Absolute current load:
– The lower the current flowing through the motor starter, the lower the power loss
– In the case of soft starters in which the soft start function has been deactivated, the
● Installation altitude
If the installation altitude exceeds 1,000 m, a reduction of the rated operational current is
required for thermal reasons. For more details, refer to the technical specifications:
"Installation altitude"). (Page 143)
88
:
a
enclosure.
The lower the maximum ambient temperature T
motor starter can be.
(= heat) inside the device. If a small amount of self-heating occurs, the ambient
temperature T
can be higher.
a
maximum permissible rated operating current I
starter; sDSte).
is the temperature of the air surrounding the motor starter
a
, the higher the current load on the
a
is restricted to 9 A (≡ electronic direct
e
Manual, 08/2014, A5E02548958A/RS-AA/004
M200D AS-Interface Standard

Advertisement

Table of Contents
loading

Table of Contents