Siemens SINUMERIK 840C User Manual
Page 478
12.93
7 Drive Machine Data (SIMODRIVE Drive MD)
7.2.2 FDD MD (data description - SW 3)
Note:
The velocity of a feed axis is matched with NC-MD 2560 (maximum axis velocity). The motor
speed which corresponds to this maximum value must be entered in drive-MD 1401.
Allowance is made for the spindle pitch plus any existing gear ratios, etc. in the relationship
between NC-MD 2560 and drive-MD 1401.
Reduction factor max. motor speed set-up mode
1402
Default value
Lower input limit
Upper input limit
Units
1
0
100
%
Active
at once
Input of reduction factor for set-up mode. The maximum permissible speed (MD 1401) and the
motor speed monitor (MD 1405) are the references for the reduction factor, i.e. the maximum
motor speed in set-up mode is calculated from MD 1402 x MD 1405 x MD 1401.
Creep speed pulse suppression
1403
Default value
Lower input limit
Upper input limit
Units
0
0
7 200
rev/min
Active
at once
Input of creep speed for pulse suppression. If the absolute speed actual value drops below the
specified speed limit, e.g. owing to cancellation of the controller enabling command, in the
course of a creep operation, the pulses are suppressed by a software function and the drive
shut down until it is re-enabled by SERVO. The default value 0 means that the machine data is
deactivated; pulse suppression is then implemented solely via the machine data "Timer pulse
suppression" (MD 1404).
The functionality of this machine data is required:
1.
With high inertia as zero speed may not be reached in some cases.
2.
To reliably preclude overshoot during positioning.
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.
Timer pulse suppression
1404
Default value
Lower input limit
Upper input limit
Units
100
0
1 000
ms
Active
at once
Input of timer for pulse suppression by means of drive. In the event of a fault (in generator
braking mode), the control pulses for the power section transistors are suppressed on the
drive side after expiry of the time set in the adjustable timer. Monitoring takes place
sequentially on the drive and servo sides with variously adjustable timers.
©
Siemens AG 1992 All Rights Reserved 6FC5197- AA50
7–63
SINUMERIK 840C (IA)