Siemens M200D 사용자 설명서

 

Functions 

 

3.7 System monitoring 

M200D AS-Interface Basic 
Manual, 03/2009, A5E01668085-01 

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3.7 

System monitoring 

3.7.1 

Current limit values 

Description   

The motor current and current limit values can be used to determine different system 

statuses: 

 

System status 

Current value 

Protection by 

Motor blocked 

Very high current flowing 

Blocking protection 

Motor runs at no load (e.g. 

because system is damaged) 

Very low current flowing 

(< 18.75 % of I

e

) 

Residual current detection 

Response to residual current detection   

Residual current detection responds when the motor current in all three phases falls below 

18.75 % of the set rated operating current. In this case, the motor starter shuts down the 

motor. 
Residual current detection is deactivated by setting the rotary coding switch to 

"CLASS OFF". 

 

 

Note 
When the motor is switched on, residual current detection is suppressed for around 1 

second. 

 

Blocking current monitoring   

The blocking current specifies how much current is consumed by the motor (at rated voltage) 

when the axis blocked.  
The blocking current monitoring function detects when a motor axis is blocked mechanically. 

The block causes the motor to consume more power. The "blocking current" is a defined 

monitoring threshold for the motor current consumption. 
It is monitored as follows:  

When the motor starts, the tripping limit for the blocking current is set permanently to 800 % 

of the rated operating current for a period of 10 s. During operation, the "blocking current" 

tripping limit is set permanently to 400 % of the rated operating current. 
If the blocking current is exceeded, the motor starter detects blocking. Blocking time 

monitoring is activated as of the point at which the blocking current is exceeded. If the 

blocking current flows for longer than the blocking time, the motor starter automatically 

generates a shutdown command.