Setting The Start Pulse For The Speed Controller; Setting Of Limit Value For Closed-Loop/Open-Loop Operation - Siemens SIMOTRAS 6SG7050 Operating Instructions Manual

Start-up

7.6.13 Setting the start pulse for the speed controller

Lifting gear:
In the case of lifting gear, the I component of the speed controller command cannot start from a
value of zero when "Release brake" is entered, but from a fixed setting value that is selected to
prevent the slumping of a suspended load when the brake is released. The basis for this can be
either a constant load or the result of an existing load measurement can be fed into the SIMOTRAS
HD converter using an analog input. In addition, the start pulse for the lowering operation can be
reduced using U652.
Constant start pulse
Lifting:
U651: Setting value for I component of speed
controller
Lowering:
U652: Reduction factor for the setting value used in lifting for the I component of the speed controller
Overhead travel gear:
For overhead travel gear in the open air which is subjected to strong winds, it may on occasion be
prudent not to let the I component of the speed controller start at zero when "Release brake" is
entered, but at a setting value. Setting the I component also acts as the breakaway torque.
Clockwise:
U651: Setting value for I component of speed
controller for clockwise rotation (factory
setting 0%)

7.6.14 Setting of limit value for closed-loop/open-loop operation

• Determine switchover threshold for closed-loop and open-loop operation according to control
characteristics (Section 3.3.6 and 3.3.7) and enter as values in parameters U628 (value) and
U629 (hysteresis)
for lifting gear: U628 = 60%
for travel gear: U628 = up to 95%
• With the master switch fully open and speed U628 is reached, the SIMOTRAS HD receives the
"Zero delay angle" command.
The SIMOTRAS HD then outputs the full output voltage if outside the setpoint reduction range.
• Setpoint and actual value monitoring (F031) is not active in open-loop operation.
Overspeed monitoring (F038) is always active.
Actual speed value
(K0166)
Fig. 7.6.14.1 Time characteristic when switching over to open-loop operation
7-16
Open-loop
operation
U628
Closed-loop
operation
Load measurement /variable start pulse
Lifting:
U655: Selection of connector via which an
existing load measurement is to be fed
into the SIMOTRAS HD converter
Anti-clockwise:
U656 = 453: Use setting value in U653
U653: Setting value for I component of speed
controller for anti-clockwise rotation
(U653=value in U651)
t
SIEMENS AG
SIMOTRAS HD
01.04
6SG7000-0BA76
Operating Instructions