Checking Direction Of Rotation Of The Motor; Setting The Speed Control Loop - Siemens SIMOTRAS 6SG7050 Operating Instructions Manual

Start-up
7.6.9

Checking direction of rotation of the motor

• Enter first setpoint stage from master switch (i.e. a travel command).
• If the drive accelerates or is running at maximum speed:
Reverse the phase sequence of the motor output or the polarity of the tachometer connection.
• For lifting gear:
positive setpoint = mechanical "Lift" direction of rotation
negative setpoint = mechanical "Lower" direction of rotation
For travel gear:
positive setpoint = forwards / right,
negative setpoint = backwards / left
If this is not the case, reverse the phase sequence of the motor output and the polarity of the
tachometer connection
• Set speed setpoint to medium speed, e. g. nset = +5V = +50% (lift)
• Check the actual lifting speed using parameter r025 (display +50%).

7.6.10 Setting the speed control loop

Formula:
The following settings will normally produce a stable control response:
P225 Controller gain Kp = 3 to 10
P226 Reset time Tn = 0.150 to 0.500 s
Optimizing the speed control loop:
Enter the speed setpoint steps without a ramp-function generator and record the step response for
the speed control loop.
• Parameterize square wave generator:
P480 = 5.0 % (step level 1)
P481 = 2.0 s
P482 = 0.0 % (step level 2)
P483 = 2.0 s
P625 = 203
Rotor stage S1 is active
• Enter first setpoint stage from master switch (i.e. a travel command).
• Trace the actual speed value (X175 terminals 14 and 15) on an oscilloscope. The oscillogram
will display the step response of the speed control loop.
Speed setpoint
Actual speed value
Fig. 7.6.10.1
7-12
(duration of step)
(duration of step)
(use square wave generator instead of the setpoint from the master switch)
Step response of speed control loop without ramp-function generator, ideal shape
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SIEMENS AG
SIMOTRAS HD Operating Instructions
01.04
6SG7000-0BA76