Siemens SINUMERIK 840C - Manual (Page 525)

7 Drive Machine Data (SIMODRIVE Drive MD) 07.97
7.3.2 Drive MD (data description)
Breakdown
torque limitation
1/n 2
Power
limitation
1/n
Resultant
torque limit
value
MD 1145
Constant
torque range
Speed
MD 1235
Reduction factor MD 1236
with selection of 2nd power
limit
Additional limitation
through MD 1237 in
generator operation
Torque limitation
MD 1230
Reduction factor MD 1231
with selection of
2nd torque limit
Reduction factor MD 1223 in
generator operation
Additional limitation through
MD 1239 in set-up mode
Constant power range
Power limitation
Breakdown torque
limitation
2nd torque limiting value 1231
Default value Lower input limit Upper input limit Units
100.0 5.0 100.0 %
Active
at once
The 2nd torque limit value entered in MD 1231 acts as a reduction factor referred to the 1st
torque limit value (MD 1230). It becomes active only if the 2nd torque limit value is selected
via the PLC control word and the motor speed exceeds the value set in MD 1232 with
hysteresis (MD 1234).
Switching speed from MD 1230 to MD 1231 1232
Default value Lower input limit Upper input limit Units
6 000.0 0.0 50 000.0 rev/min
Active
at once
Input of speed above which switchover from the 1st torque limit to the 2nd torque limit (MD
1231) can take place. A settable hysteresis (MD 1234) is applied during switchover. The 2nd
torque limit value is activated only if the motor speed exceeds the speed threshold with
hysteresis and if the 2nd torque limit value has been selected via the PLC control word.
7–110 © Siemens AG 1992 All Rights Reserved 6FC5197- AA50
SINUMERIK 840C (IA)