5 mode 2/12: automatic control of the brake, Mode 2/12: automatic control of the brake, 12 basic drive functions – Lenze E94AxPExxxx User Manual
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Lenze · 9400 Servo PLC· Reference manual · DMS 4.0 EN · 11/2013 · TD05/06
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12
Basic drive functions
12.12
Brake control
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12.12.5
Mode 2/12: Automatic control of the brake
If mode 2 or mode 12 is selected in
, the brake is controlled automatically, i. e. if another
basic function is activated, which results in a traversing of the drive, the brake is automatically
opened and operation is enabled. If the corresponding basic function is deactivated again, the drive
is stopped via the basic function "
" and the brake is automatically closed again if the speed
setpoint and the actual speed value are below the speed threshold set in
.
Tip!
The 2/12 mode is the usual mode to control the brake.
In this mode, the BRK_bReleaseBrake input should be set permanently to FALSE unless a
manual release is required.
If BRK_bReleaseBrake = TRUE, the brake is released permanently and the automatic control
cannot close the brake.
• By the selection of the mode it is also defined in which way the brake is to be controlled:
• Mode 2: Current monitoring active, brake is automatically controlled via motor brake control
module.
• Mode 12: Current monitoring deactivated, brake is controlled via digital output. If a motor
brake control module is installed, this will also be controlled.
• The brake is also activated automatically if a quick stop is activated in the drive, e.g. via the basic
function "
" or as a response to a fault and also in case of a controller inhibit and pulse
inhibit.
Behaviour in case of pulse inhibit
• By setting the input BRK_bDisableStop to TRUE, an application of the brake at standstill or
during quick stop can be avoided; by this the drive remains position-controlled.
• After the brake has been activated automatically and the brake closing time has elapsed, the
controller inhibit is set automatically by the basic function "brake control".
• For the operation with a motor brake control module (mode 2) the desired polarity for
controlling the brake can be set in
Note!
The digital outputs are not suitable for the "direct" control of a motor holding brake!
• The digital output used must be connected to a relay or power contactor which
switches the brake supply.
• If a power contactor is used, the response and release time of the contactor contact is
also added to the response and release time of the brake.
For the operation with the motor brake control module:
• For single-axis controllers (Single Drive) the control (release) of the motor holding
brake is only possible if both the DC-bus voltage and a 24-V supply voltage are
available for the motor brake control!
• For multi-axis controllers (Multi Drive) the motor holding brake can also be released
without a DC-bus voltage.