324 01-6203-01R3, CG Drives & Automation
10.11.4. Brake closing level
In some cases, a low speed does not make any sense from the application point of view.
This includes applications with unfavorable load features, such as static friction. In such
applications and depending on the type of control, a low speed may cause an unwanted
behaviour. In order to prevent such an operating situation, a closing threshold can be set.
The power section will only be switched on and the holding brake is opened if the setpoint
is higher than the closing threshold. In order to prevent the holding brake from being
closed if the setpoint only shortly falls below the closing threshold during operation, a
delay time can be set in addition.
Preconditions
If the holding brake is controlled manually via an external control signal: It must be
ensured that the motor does not move while the motor control is deactivated by this
function.
Details
The function is part of the holding brake control and does not have an independent
functionality.
Relevant parameters:
• 0x2820:007 (P712.07): Brake closing threshold
• 0x2820:012 (P712.12): Closing threshold delay
Setting notes:
• The function is active if the brake closing threshold is higher than 0 Hz.
• In order that the brake can work correctly, the brake closing threshold must be set to a
value that is greater than or equals the minimum frequency 0x2915 (P210.00).
• The brake closing threshold has a permanent hysteresis of 1 Hz in order to prevent an
unwanted change-over. Exception: If the brake closing threshold is set to 0 Hz, the
hysteresis is also 0 Hz.
• If the brake closing threshold is set to 0 Hz, a start command is only required to release
the holding brake during automatic operation.
• This function can be combined with the setting of a holding load.
Name / value range / [default setting]
(P712.07)
Holding brake control: Brake closing threshold
(Brake control: Closing thresh.)
0.0 ... [0.2] ... 599.0 Hz
Threshold for closing the holding brake.
The power section will only be switched on and the holding brake will
be opened if the setpoint is higher than the threshold set here.
In order that the brake can work correctly, the brake closing threshold
must be set to a value that is greater than or equals the minimum
frequency 0x2915 (P210.00).
The brake closing threshold has a permanent hysteresis of 1 Hz in
order to prevent an unwanted change-over. Exception: If the brake
closing threshold is set to 0 Hz, the hysteresis is also 0 Hz.
In case of a setting of "0 Hz", only a start command is required to
release the holding break during automatic operation.
(P712.12)
Holding brake control: Closing threshold delay
(Brake control: ClosingThr delay)
0 ... [0] ... 10000 ms
By setting a deceleration, a closing of the holding brake can be
prevented if the frequency only temporarily falls below the brake
closing threshold
0x2820:007 (P712.07).
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