Start-up 01.04
7-12 SIEMENS AG 6SG7000-0BA76
SIMOTRAS HD Operating Instructions
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 (duration of step)
P482 = 0.0 % (step level 2)
P483 = 2.0 s (duration of step)
P625 = 203 (use square wave generator instead of the setpoint from the master switch)
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.
t
t
Speed setpoint
Actual speed value
Fig. 7.6.10.1 Step response of speed control loop without
ramp-function generator, ideal shape
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