Siemens TV Converter Box 611 User Manual

Configuring the motor 

 

5.3 Short-time duty S2 and intermittent duty S3 

5.3 

Short-time duty S2 and intermittent duty S3 

Short-time duty S2 

In the case of short-time duty S2, the load time is so short that the final thermal state is not 

reached. The subsequent zero-current break is so long that the motor practically cools down 

completely. 

 

CAUTION 

 

An excessive load can lead to the destruction of the motor. 
The load may not exceed the value I

MAX

 specified in the data sheets! 

 

The motor may only be operated for a limited time t < t

MAX

 with a current I

N

 < I

M

 ≤ I

MAX

. The 

time t

MAX

 can be calculated using the following logarithmic formula:  

W

0$;

 W

7+

yOQ

Y

Y



 

with ν = (I

M

 / I

N

)

2

 and the thermal time constant t

TH

. 

The thermal time constants, the maximum currents and the rated currents of the motors can 

be taken from the data sheets. 

 

 

Note 
The above equation applies with the prerequisite that the starting temperature of the motor is 

the same as the intake temperature of the water cooling system T

VORL

 in accordance with the 

data sheet. 

 

Example 

Motor 1FW6190-xxx15-2Jxx is to be operated from a cold state at maximum current. 
●  I

MAX

 = 47 A, I

N

 = 26 A; this results in ν = 3.268 

●  t

TH

 = 180 s 

 

 

The motor can be operated for a maximum of 66 s at maximum current. 

 

1FW6 Built-in torque motors 

78

 

Configuration Manual, 05/2009, 6SN1197-0AD00-0BP7