Protective functions
© KEB, 2012-10 COMBIVERT F5-A, -E, -H Page 7.13 - 31
7
Motorstrom / Dauerstrom
( Is / Id )
dr.34
Motorschutzzeit
min Is/Id
dr.35
Motorschutzzeit
bei Imax
dr.50
Motorschutz
min Is/Id
A warning level can be adjusted in Pn.15 "OH2 warning level". If the counter reaches this level, the adjusted
response in Pn.14 "Waning OH2 stop. mode" is carried out.
The counter is reduced if the ratio apparent current to continuous current is lower than dr.50. The recovery time
dr.36 "mot.prot. recovery time" is the time the counter requires to count from 100% to 0% (after triggering of
the error, i.e., without current ow). The error triggered by the motor protection function can already be reset
before the recovery time expires.
7.13.10 Power-off function
The Power-Off function has to provide a controlled deceleration of the drive until standstill in case of undervol-
tage (e.g. due to power failure). The kinetic energy of the rotating drive is used to support the inverter DC-link
voltage. As a result the inverter remains in operation and can decelerate the drive in a controlled manner.
Especially in the case of parallel running drives (e.g.textile machines) the uncontrolled running down of the
motors and the consequences resulting from it (thread breakage) can be avoided.
For the various operating modes, the amount of available functions differs.
For the vector controlled modes, some parameters have no function or are even hidden.
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