Siemens Boating Equipment M200D 사용자 설명서

Installation / connection 

 

4.1 Installation 

 

M200D AS-Interface Basic 

48

 

Manual, 03/2009, A5E01668085-01 

4.1.2 

Derating 

What is derating?   

Derating allows devices to be used even in severe 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

u

:

 

 

–  The ambient temperature T

u

 is the temperature of the air surrounding the motor starter 

housing. 

The lower the maximum ambient temperature T

u

, the higher the current load on the 

motor starter can be. 

–  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 

(= heat) inside the device. If slight self-heating occurs, the ambient temperature T

u

 can 

be higher. 

–  In the case of soft starters in which the soft start function has been deactivated, the 

maximum permissible rated operating current I

e

 is restricted to 9 A (≡ electronic direct 

starter; sDSte).