To Next Page

To Previous Page

144 ADV200 • Functions description and parameters list

ref 1 mon, visible in the diagrams of GF_eXpress.

When the Start positioner command (in the list of commands of the “Positioner” application) is sent, the value

of parameter 664 Speed setpoint is increased. When this speed reference reaches the threshold dened by

parameter 3176 Brake open spd thr (and in any case not before a time equal to PAR 3172 Brake open de-

lay, which is always measured from the moment the brake opens) the pre-torque value injected (Brake open

thr mon) after opening is reset to 0 with a ramping down time that is always equal to the value of 3188 Brake

torque time.

In the transient opening phase the “positioner” could generate a speed reference value that is higher than the

“Brake open spd thr” threshold. This, in turn, could result in the removal of the pre-torque due to the incorrect

assumption that a positioner has started. To prevent this, parameter 3172 Brake open delay can be set so that

the comparison with the speed reference is only performed after a certain delay.

In this mode the “Brake fault” alarm can never be triggered as it is not envisaged in “Hoist mode 2”.

Closing phase:

When the drive is disabled (also due to any alarms that are capable of disabling it) a close brake command is

sent immediately, regardless of the operating condition.

For normal closing, set parameters 3174, 3178 and 3190.

When the brake opening phase is complete and after a delay equal to at least the value of 3190 Brake close

wait (measured from the moment pre-torque removal ends) it waits for the speed reference to fall below the

value set in 3178 Brake close spd thr.

Parameter 3174 Brake close delay can be used to enter a delay between the moment the closing condition

occurs and that in which the close command is actually sent by the drive.

After the brake closing condition has occurred (within the time set in Brake close delay) it is also possible to

restart the drive by sending a new positioning command. In that case the timer is reset and the drive waits for

the closing condition again, which occurs when the speed reference falls to below the value of Brake close

spd thr and after the delay set in Brake close wait.

Parameter 3190 Brake close wait can thus reasonably be set to a value that is slightly less than the position-

ing time. It ensures that within the set time the speed reference can also fall below the Brake close spd thr

value without the close command being sent.