SSD COMPANY LIMITED 637f User Manual

 

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07-02-10-01-E-V0505.doc 

Product Manaul  Type: 637f

 19 

 

Due to the line-ripple of the DC-Bus, the rate of usable output voltage is reduced as follows.  
This reduction affects the maximum attainable speed of the applied motor. 
 

Three-phase supply: 
 

The unloaded output voltage will be reduced to approx. 90%, maximally 85 

% 

 
 

Single-phase supply: 50 – 60 Hz 

 

 

         only servo drive 637f / ..02 up to 06 

see the following diagram: 

 

 

 

 

 

 

 

 

 

 

 

 

 
Hint for parameterization: 
To avoid unexpected tripping of the under voltage threshold, the parameter setting should be left on 
default values (EASYRIDER

®

 Windows – Software). 

 
Required motor-terminal-voltage for specified speed. 

 

Approximation:  (up to 3000RPM) 
 
Ukl = 1,2 * (EMF * n / 1000) + I * (Rph + RL) [V]

 

 
Ukl 

Required motor voltage [V

 RMS

] 

EMF  Back-EMF of motor  [V

 RMS

] / 1000 RPM 

Rph 

Resistance of motor (between terminals) [

Ω] 

RL 

Line resistance of motor cable [

Ω] 

I Motor-current 

[A

 RMS

] 

 

Output current [A

]

RMS

Derating of servo drive output voltage in case of single-phase operationen

2 

4 

6 

8 

10 

20 40 60 80 

100 

0 

0 

12 

[%] 

 

Output voltage in % of unloaded condition