Siemens SINAMICS S120 Manual page 41

3 DCC Blocks
Commissioning Tips
When first commissioning torque proving, it is important to ensure that all of the
reference values are correctly parameterized as described in the SIMOCRANE
Operating Instructions Drive-Based Technology on page 24, and verified via traces
in STARTER. From the start, keep torque proving disabled until all of the torque
proving parameters have been properly parameterized. If two hoists exist, ensure
master slave operation is properly configured before commissioning torque
proving.
StartPulse must either be enabled or disabled. Enabling StartPulse is highly
recommended. StartPulse retentively saves the integral component of torque
setpoint output of the speed controller at standstill before the brake is closed. Then
StartPulse sets the speed controller to the retentively saved value when the signal
to open the brake is output, quickly establishing the torque.
Setting the value for "r_NoLoadTorque (%)" is necessary to the proper operation of
the TorqueProving block. With no load on the hook (only lifting equipment,
hardware etc.) present, trace "rOut_ActualTorqueAtPreviousBraking (%)". Start
with the hook near the ground, hoist slightly up and allow the brakes the close until
that value changes. Then repeat the process hoisting up, stop at the middle, and at
the top. Then do the same on the way down. There should be around six points
recorded, take the average of that value, and choose a value about 1-2% lower
than the average value. This can be used as your no load torque.
For setting minimum torque, first decide if a minimum torque value is needed. If
your loads vary greatly from very light to very heavy loads, setting a minimum
torque value near the upper limit of your rated torque may put a heavy mechanical
stress on the system because even at light or no loads, torque will develop to
almost the rated torque value before the brakes release. If a minimum torque value
is required, find a value around or slightly higher than the average actual torque
value required to lift the average load. It is important to remember that the
minimum torque value (%) is percentage of the maximum. For example, if the user
wants to set a 30% minimum torque value of the motor rated torque r333 which is
10 Nm, then 30% of 10 Nm is 3 Nm, which will be the desired minimum torque
value. If the reference torque, or maximum torque is 24 Nm, then divide the desired
minimum torque value 3 Nm by the reference or maximum torque value of 24 Nm
to get a value of 0.125, or 12.5 %. So a value of 12.5% in the minimum torque
value parameter will yield a 30% minimum torque value of the motor rated torque.
For applications where the load varies but a minimum torque is still required,
boDeactivateTorqueProvingAtNoLoad can be activated. This way, when a no load
condition is detected (e.g. the last saved torque at braking is less than the
parameterized no load torque) torque will not need to be proven. For example, after
moving a load to a destination and placing the load on the ground, unhooking the
load, the last saved torque should be lower than the no load torque, and so the
torque will not have to be proven, thus reducing the mechanical stress on the
system.
After parameterizing all of the above depending on the application, then enable
torque proving. Move the master switch to get a feel for the performance (e.g.
response times between when the move command is given to when the brake
actually opens). If the response times are too sluggish, the setting torque building
speed and setting torque building time can be adjusted.
Setting torque building speed can be increased in small increments by about
0.5 %. This value should not be set too high because the higher this value is set
the higher the mechanical stress on the brakes will be.
Instead of increasing the setting torque building speed, the setting torque building
time can be decreased, so that the setting torque building speed can be achieved
quicker. Or both the setting torque building speed and time can be adjusted to
achieve desired results.
Extended Crane Drive-Based Technology AC
Extended Crane Drive-Based Technology SINAMICS S120
DCC Add-On Description 109767457, V1.2, 09/2019
41