5 behaviour in case of pulse inhibit, Behaviour in case of pulse inhibit, 8basic drive functions (mck) – Lenze 8400 StateLine User Manual
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Lenze · 8400 StateLine · Reference manual · DMS 12.0 EN · 06/2014 · TD05/TD14
417
8
Basic drive functions (MCK)
8.4
Holding brake control
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8.4.5
Behaviour in case of pulse inhibit
Setting the pulse inhibit causes a load-controlled coasting of the motor until the pulse is enabled
again. In the enabled controller, the pulse can be inhibited e.g. due to a DC overvoltage, DC
undervoltage or the "Safe torque off" request.
The brake response to pulse inhibit can be parameterised under
.
Activate brake immediately when pulse is inhibited
If bit 1 is set to "0" in
(Lenze setting), the brake will be immediately applied when the pulse
is inhibited to avoid damage to the mechanical components.
Especially in the case of hoist drives, immediate engagement of the brake is absolutely necessary for
safety reasons if the pulse inhibit function of the drive controller has been activated!
Only activate brake below threshold for brake activation
If bit 1 and bit 3 are set to "1" in
, the brake remains released until the lower speed threshold
is reached to avoid an excessive wear of the brake.
• The braking action only takes places due to the friction in the load mechanics.
• The brake will not be applied until the motor speed has reached the threshold for brake
activation. Hence, the function depends on the signal of the speed encoder.
During uncritical operation (horizontal loading condition), delayed brake application may be
required to protect the brake in case of high centrifugal masses.
In case of vertical motion (bit 3 = 0), this function is not active due to safety-related reasons.
Related topics:
Stop!
For parameterising the response to pulse inhibit in
, the energy conditions of the
machine should be evaluated first.
The energy stored in the machine can be considerably higher than the permissible
switching energy and thus lead to the destruction of the brake if applied directly!
Danger!
This behaviour is valid in (semi) automatic operation when the bMBrakeRelease input is
set to FALSE.
When the bMBrakeRelease input is set to TRUE (supervisor operation) in automatic
mode, the brake is not applied at pulse inhibit!