KEB COMBIVERT F5 Reference Manual page 133

LI - Input Parameters
ESD - Emergency Slowdown
The Emergency Slowdown (ESD) can be used as an alternate slowdown
profile, or quick stop.
The ESD input is an active low input controlled by the controller. 'ESD Input
Failure' fault will occur if the ESD input is not detected (high) at the beginning
of a run.
The ESD deceleration profile is separated into two parts. When the ESD
input is dropped (pulse or constant), the drive will decelerate to half of the
LS02 High speed using the dedicated ESD/ETS deceleration and jerk profile
settings (LS48-49). The ESD profile generated by the drive will bypass any
controller-generated serial or analog profile. When the speed is less than half
of LS02 speed, the drive will use the one floor deceleration and jerk settings
(LS33-35) until LS01 leveling speed is reached. The drive will then continue
to run at the LS01 leveling speed until the hardware direction iput is dropped.
When the direction is dropped, the drive will decelerate to zero speed using
the Emergency (Intermediate Speed 3) profile settings LS43-45.
After the ESD has been signaled, the maximum speed will be limited to the
LS01 Leveling Speed until the end of the run when the enable command is
dropped.
The final stopping jerk when the direction is dropped at the end of the run will
use the LS43-45 Emergency profile deceleration and jerk rates.
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