Application Setup CDHD
156 User Manual
Va rCom D escr iption
DI SMODE 1 No active disabling; dynam ic braking on fault only.
DI SMODE 2 No active disabling; dynam ic braking on any disable.
DI SMODE 3 Active disabling on fault * ; no dynam ic braking.
DI SMODE 4 Active disabling on fault * ; dynam ic braking on fault only.
DI SMODE 5 Active disabling on fault * ; dynamic braking on any disable.
* N ote : Faults that require imm ediate disable (to prevent drive damage) and
feedback faults that might cause a com mutation error (runaway m otor
condit ion) cannot issue Active Disabling.
Three param eters affect the behavior of the disabling and braking.
Va rCom D escr iption
DI SSPEED
Defines the velocity t hreshold below which the m otor is
considered st opped and the Active Disable tim er starts the
countdown to disable. The m otor velocity m ust rem ain below
this threshold for at least 50 m s for the m otor to be
considered st opped.
DI STI ME
Defines the continuous t im e the m otor m ust rem ain below
DI SSPEED before the drive is disabled. The DI STI ME count er
begins only after motor velocity has been below DI SSPEED
for at least 50 ms.
DECSTOP Defines the deceleration rat e of the ram p down.
6 .1 4 .1 Act ive D isa ble
Active Disable prevents mot or coasting while the axis is disabled.
The Act ive Disable m echanism brings the m ot or to a st op by m eans of a
controlled ramp down to zero velocity, and then disables the drive.
N ote: Active Disable cannot be applied when the drive is in a current control
m ode (OPMODE 2 or OPMODE 3); it works in all other operation modes.
Figure 6-19 shows how m otor coast ing occurs when Active Disable is not used.
As soon as the drive is disabled, the velocity com mand is set to zero. The actual
velocity then decreases as a function of the inertia and friction.
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