Siemens 6SR41 series - Signal Polarities

Application and Operation
6.1 Signal Frame of Reference for Motor Control
Product User Manual
Operating Instructions, Version AE 12/2009, A5E01454341C
107
constant, the motor will slow to zero and then accelerate in the forward direction, passing
back into quadrant I.
The injection frequency must always be opposing the direction of rotation and is only used in
the case of braking or negative energy flow. Therefore, it is zero in the motoring quadrants (I
and III) and is the inverse polarity of the electrical frequency in the braking quadrants (II and
IV).
6.1.2 Signal Polarities
Table 6- 1 Signal Polarities
Signals Quadrant 1 Quadrant 2 Quadrant 3 Quadrant 4
Rotation speed (ω
r
) + - - +
Electrical frquency (ω
s
) + - - +
Slip (ω
slip
) + - -
Torque + + - -
Current (I
q
) + + - -
Voltage (V
qs
) + + - -
Acceleration (ω
inj
) + + - -
Injection Frequency 0 + 0 -
Power (flow) + - + -
Mag Current (I
d
) + + + +
Voltage (V
ds
) + + + +
Note
For the electrical frequency (ω
s
) in the braking quadrants (II and IV) where the slip opposes
the rotational speed, when the speed magnitude approaches the slip magnitude, the
electrical polarity is uncertain (when the slip magnitude is greater than the rotor speed, the
sign will match that of the slip rather than the sign of the rotor speed).