to note these values and store them in a safe place for future reference. So that you will be
able to enter these values manually (without auto tuning) in case of a driver replacement.
Remember that the auto tune process must be performed when the relative position
between motor and encoder changes.
d) After auto tuning, if the car moves in wrong direction, please toggle the “2.17- Motor
direction” parameter.
20.4. Improving start-ups
In gearless synchronous machines, the car tends to slip rapidly towards the heavy direction at the
moment the brakes are released. For this reason, a special “Anti-rollback function” is
implemented in ADrive. This function must be tuned carefully in order to minimize the undesired
startup trembling. A practical procedure to tune this function is as follows:
a) Set the “1.14-Mechanical Brake On Delay” parameter to 2.0 seconds. This will ensure
that the elevator will be held at rest during 2 seconds after brake release.
b) Unload and position the car to the topmost 1 or 2 meters in the shaft. This is the situation
with the worst case of weight balance.
c) Set the “3.5- Anti Roll Back” parameter to “Enabled”.
d) Set the “3.6- KP_ARB” parameter to 60
Set the “3.7- KD_ARB” parameter to 20
Press the down button in the recall terminal. The car will slip upwards a little and will
stop. After the end of “Mechanical brake opening time” (which we had set to 2 seconds”,
the car will start to move downwards with inspection speed. Increase the “3.6” and “3.7”
parameters slightly and retry moving the car in recall mode. Observe the amount of slip in
each retry until you find the values where the slip is not noticeable.
In general, the value of “3.7” should be about 1/3rd of the value of “3.6”. For example, if
you set “3.6” to 120 then 40 will be a reasonable value for “3.6”.
When these parameters are given too high, the motor will make loud noises and will start
to shake on startup. This kind of startup is harmful for the driver and the motor. Also is
very undesirable in terms of passenger comfort. So it is advised to find the critical values
which lead to this undesired startup and to make sure NOT to set the values to greater
than the half of these critical values.
e) Change the “1.14-Mechanical Brake on Delay” parameter to 1.0 seconds again. If this
parameter is given too long, the car will waste time unnecessarily. If it is too short, the
motor will try to move before the brakes are fully released and this will be felt in the car as
a harsh startup.
To Next Page
Loading...