Brake Closing Level - Lenze i55AE125B Manual

Additional functions
Holding brake control

Brake closing level

11.11.4 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 applica-
tions 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 sec-
tion 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 function-
ality.
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
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 hystere-
sis 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.
•
Parameter Name / value range / [default setting]
0x2820:007 Holding brake control: Brake closing threshold
(P712.07) (Brake control: Closing thresh.)
0.0 ... [0.2] ... 599.0 Hz
0x2820:012 Holding brake control: Closing threshold delay
(P712.12) (Brake control: ClosingThr delay)
0 ... [0] ... 10000 ms
• From version 03.00
478
0x2915 (P210.00).
Info
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 fre-
quency 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.
By setting a deceleration, a closing of the holding brake can be preven-
ted if the frequency only temporarily falls below the brake closing
threshold 0x2820:007 (P712.07).