Siemens SINUMERIK 840C Installation Instructions Manual page 419

7 Drive Machine Data (SIMODRIVE Drive MD)
7.1.2 MSD MD (data description - SW 3)
19
Default value
0
Input of parameter setting for a PT2 filter (low-pass) in the speed setpoint channel. The low-
pass filter is inserted on the output side of the ramp-function generator and is effective only if
the speed setpoint smoothing function (MD 53, bit 4) is activated at the same time.
20
Default value
0000
Display of the monitoring machine data "Diagnosis speed actual value". If an impermissibly
large speed deviation occurs within the sampling period, then the value of the machine data is
incremented. Sporadic responses by a few increments can be ignored since these do not
influence the speed controller. A high disturbance level will cause the contents of MD 20 to be
increased repeatedly by several increments.
Possible causes of disturbances
• Encoder shield not earthed
• Encoder defective
• Earth connection of electronics ground in MSD module faulty
• Motor earth not connected in MSD module
• Value entered for motor moment of inertia too high
• Evaluation electronics
21
Default value
12
Input of response value for monitoring of the PLC status message n
MD 241).
22
Creep speed pulse suppression motor 1
Default value
Rated speed
––––––––––––––
256
Input of response value for the internal n
rotation. When the speed n
stop with any remaining kinetic energy.
Note:
This n threshold is not the same as the response value of the n
min
set to the same value.
7–4
Rounding degree speed setpoint
Lower input limit
0
Diagnosis speed actual value
Lower output limit Upper output limit
0000
n for n < n message motor 1
min act min
Lower input limit
0 Rated speed
Lower input limit
0 Rated speed
sensor for stopping the drive with no reverse
min
is reached, the drive torque is cut off and the drive coasts to a
min
©
Siemens AG 1992 All Rights Reserved
Upper input limit
30
–
Upper input limit
< n (see also
act min
Upper input limit
monitor, but it may be
min
SINUMERIK 840C (IA)
10.94
Active
at once
Units
–
Active
at once
Units
Hex
Active
at once
Units
rev/min
Active
at once
Units
rev/min
6FC5197- AA50