Siemens SINUMERIK 840C - Manual (Page 531)

7 Drive Machine Data (SIMODRIVE Drive MD) 09.95
7.3.2 Drive MD (data description)
Controller enable
n
t
Case 1
MD 1403 = 0
t
I
t
n
Case 2
MD 1403 = X
I
Motor coasts out
Timer pulse suppression 1404
Default value Lower input value Upper input value Units
100.0/5 000.0 0.0 100 000.0 ms
Active
at once
Input of timer for pulse suppression by drive. In the event of a fault (in generator braking mode
or with controller disabled), the control pulses for the power section transistors are suppressed
on the drive side after expiry of the time set in the adjustable timer. The pulses are
suppressed beforehand if the speed drops below the threshold set in machine data "Creep
speed pulse suppression" (MD 1403) before the timer expires. Monitoring takes place
sequentially on the drive and servo sides with variously adjustable timers. The default setting is
dependent on the motor type (FDD ˆ
=100, MSD ˆ =5000) and is parameterized by the drive
configuration during start-up.
Note:
Under normal circumstances, shutdown is implemented sequentially on the drive and servo
sides, with variously adjustable timers (NC MD 156, NC MD 12240) and, in the event of a
fault, only on the drive side with timer MD 1404.
7–116 © Siemens AG 1992 All Rights Reserved 6FC5197- AA50
SINUMERIK 840C (IA)