Siemens SINUMERIK 840C - Manual (Page 422)

10.94 7 Drive Machine Data (SIMODRIVE Drive MD)
7.1.2 MSD MD (data description - SW 3)
Hysteresis MD 37 motor 1 38
Default value Lower input limit Upper input limit Units
50 0 500 rev/min
Active
at once
Input of hysteresis for machine data MD 37 (switchover speed for motor encoder evaluation).
1st torque limiting value motor 1 39
Default value Lower input limit Upper input limit Units
100 5 180 %
Active
at once
Input of the maximum permissible torque referred to the rated torque of the motor. The setting
of the limit values is referred to the rated motor torque in the constant torque range. At speeds
above the rated value, i.e. in the constant power range, the torque limitation is referred to the
appropriate working point. With a setting of, for example, 100 %, the rated torque acts as the
torque limit up to rated speed. At speeds above the rated value, the torque limit curve drops in
proportion to 1/n so that the rated output is reached in each case. MD 40-MD 43, MD 47 and
MD 50 are the corresponding machine data.
Generative limitation motor 1 40
Default value Lower input limit Upper input limit Units
100 5 100 %
Active
at once
Input of torque limit for braking operation (generator-mode torque limit). This input value is
referred to the maximum motor-mode torque (see also MD 39).
2nd torque limiting value motor 1 41
Default value Lower input limit Upper input limit Units
50 5 100 %
Active
at once
Input of 2nd torque limit value referred to the 1st torque limit (MD 39). This 2nd torque limit
can be selected via the PLC control word and machine data MD 50.
Switchover speed for MD 40 motor 1 42
Default value Lower input limit Upper input limit Units
500 0
Maximum motor
speed
rev/min
Active
at once
Input of speed above which the generator-mode limit set in machine data MD 40 is applied
(see also MD 39).
© Siemens AG 1992 All Rights Reserved 6FC5197- AA50 7–7
SINUMERIK 840C (IA)