Program features 149
Mechanical brake control
The elevator system is equipped with a mechanical brake that holds the elevator car
at standstill when the elevator drive is stopped or not powered. Typically, the drive
controls the brake open or closed via a relay output. Alternatively, the brake can also
be controlled by the elevator controller.
Mechanical brake control (with or without monitoring) is activated with parameter
35.01 BRAKE CONTROL. The monitoring signal can be connected to, for example, a
digital input. The brake on/off value is reflected by 03.06 BRAKE COMMAND, which
should be connected to a relay (or digital) output. The brake will open upon drive start
after the delay 35.04 BRAKE OPEN DELAY has elapsed and the requested motor
start torque (selected with 35.80 BRK OPEN TRQ SEL) is available. The brake will
close after motor speed decreases below 35.06 BRAKE CLOSE SPD and the delay
35.09 BRAKE CLOSE DLY has elapsed. When the brake close command is issued,
the motor torque is stored into 03.05 BRAKE TORQ MEM.
WARNING! Make sure that the machinery into which the drive with brake
control function is integrated fulfills the personnel safety regulations.
Note that the frequency converter (as defined in EN81-1), is not considered
as a safety device mentioned in the European Elevator Directive and related
harmonised standards.
If the Elevator Directive is not applicable, note that the frequency converter (a
Complete Drive Module or a Basic Drive Module, as defined in IEC 61800-2), is not
considered as a safety device mentioned in the European Machinery Directive and
related harmonised standards. Thus, the personnel safety of the complete machinery
must not be based on a specific frequency converter feature (such as the brake
control function), but it has to be implemented as defined in the application-specific
regulations.
The Mechanical brake control function also performs the following tasks:
• Torque proving checks
• Brake slip checks
• Brake open torque selection.
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