18 drive dimensioning messages – Lenze DSD User Manual
Page 462
18
Drive dimensioning messages
18.6
Brake
462
Lenze · Drive Solution Designer · Manual · DMS 4.2 EN · 12/2013 · TD23
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18.6.4
Permanent magnet holding brake is not suitable for hoist drives
Warning!
For safety reasons, the permanent magnet holding brake selected is not suitable for hoist drives (reduced
braking torque at higher speeds).
Select a motor with a spring-applied brake or ensure that an additional brake assembly provides for the
required safety.
Cause
Effects
Possible remedies
The braking torque decreases signifi-
cantly at higher motor speeds.
Braking torque is too low in case of
an emergency (mains failure, mal-
function, inverter failure). Safe brak-
ing to standstill is not possible.
• Select a motor with a spring-ap-
plied brake.
• Provide for redundant brake as-
sembly.