4 behaviour in case of pulse inhibit, Behaviour in case of pulse inhibit, 8basic functions – Lenze 8400 motec User Manual

Page 281

Advertising

Lenze · 8400 motec · Reference manual · DMS 4.1 EN · 08/2013 · TD05

281

Basic functions

8.2

Holding brake control

_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _

8.2.4

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

C02582

Activate brake immediately when pulse is inhibited
If bit 1 in

C02582

is set to "0" (Lenze setting), the brake is controlled to be closed immediately when

a pulse inhibit is set.
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

C02582

, 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

C02582

, the energy conditions of the